Download Georgian Bay Geological Synthesis, Grenville Province: Explanatory

Ontario Geological Survey
Open File Report 6143
Georgian Bay
Geological Synthesis,
Grenville Province:
Explanatory Notes for
Preliminary Maps
P.3548 to P.3552
2004
ONTARIO GEOLOGICAL SURVEY
Open File Report 6143
Georgian Bay Geological Synthesis, Grenville Province: Explanatory Notes for
Preliminary Maps P.3548 to P.3552
by
N.G. Culshaw, D. Corrigan, J.W.F. Ketchum, P. Wallace, N. Wodicka and R.M. Easton
2004
Parts of this publication may be quoted if credit is given. It is recommended that
reference to this publication be made in the following form:
Culshaw, N.G., Corrigan, D., Ketchum, J.W.F., Wallace, P., Wodicka, N. and Easton,
R.M. 2004. Georgian Bay geological synthesis, Grenville Province: Explanatory
notes for Preliminary Maps P.3548 to P.3552; Ontario Geological Survey, Open File
Report 6143, 28p.
This project is part of the five--- year Canada--- Ontario 1985 Mineral Development Agreement (COMDA), a
subsidiary agreement to the Economic and Regional Development Agreement (ERDA) signed by the
governments of Canada and Ontario.
e Queen’s Printer for Ontario, 2004
e Queen’s Printer for Ontario, 2004.
Open File Reports of the Ontario Geological Survey are available for viewing at the Mines Library in Sudbury, at the
Mines and Minerals Information Centre in Toronto, and at the regional Mines and Minerals office whose district includes
the area covered by the report (see below).
Copies can be purchased at Publication Sales and the office whose district includes the area covered by the report. Although a particular report may not be in stock at locations other than the Publication Sales office in Sudbury, they can
generally be obtained within 3 working days. All telephone, fax, mail and e-mail orders should be directed to the Publication Sales office in Sudbury. Use of VISA or MasterCard ensures the fastest possible service. Cheques or money orders
should be made payable to the Minister of Finance.
Mines and Minerals Information Centre (MMIC)
Macdonald Block, Room M2-17
900 Bay St.
Toronto, Ontario M7A 1C3
Tel:
(416) 314-3800
Mines Library
933 Ramsey Lake Road, Level A3
Sudbury, Ontario P3E 6B5
Tel:
(705) 670-5615
Publication Sales
933 Ramsey Lake Rd., Level A3
Sudbury, Ontario P3E 6B5
Tel:
(705) 670-5691(local)
1-888-415-9845(toll-free)
(705) 670-5770
[email protected]
Fax:
E-mail:
Regional Mines and Minerals Offices:
Kenora - Suite 104, 810 Robertson St., Kenora P9N 4J2
Kirkland Lake - 10 Government Rd. E., Kirkland Lake P2N 1A8
Red Lake - Box 324, Ontario Government Building, Red Lake P0V 2M0
Sault Ste. Marie - 70 Foster Dr., Ste. 200, Sault Ste. Marie P6A 6V8
Southern Ontario - P.O. Bag Service 43, 126 Old Troy Rd., Tweed K0K 3J0
Sudbury - Level B3, 933 Ramsey Lake Rd., Sudbury P3E 6B5
Thunder Bay - Suite B002, 435 James St. S., Thunder Bay P7E 6S7
Timmins - Ontario Government Complex, P.O. Bag 3060, Hwy. 101 East, South Porcupine P0N 1H0
Toronto - MMIC, Macdonald Block, Room M2-17, 900 Bay St., Toronto M7A 1C3
This report has not received a technical edit. Discrepancies may occur for which the Ontario Ministry of Northern Development and Mines does not assume any liability. Source references are included in the report and users are urged to verify
critical information. Recommendations and statements of opinions expressed are those of the author or authors and are
not to be construed as statements of government policy.
If you wish to reproduce any of the text, tables or illustrations in this report, please write for permission to the Team
Leader, Publication Services, Ministry of Northern Development and Mines, 933 Ramsey Lake Road, Level B4,
Sudbury, Ontario P3E 6B5.
Cette publication est disponible en anglais seulement.
Parts of this report may be quoted if credit is given. It is recommended that reference be made in the following form:
Culshaw, N.G., Corrigan, D., Ketchum, J.W.F., Wallace, P., Wodicka, N. and Easton, R.M. 2004. Georgian Bay
geological synthesis, Grenville Province: Explanatory notes for Preliminary Maps P.3548 to P.3552; Ontario
Geological Survey, Open File Report 6143, 28p.
iii
Contents
Abstract ...............................................................................................................................................................
ix
Introduction .........................................................................................................................................................
Overview.....................................................................................................................................................
Regional Setting of the Grenville Province in North America ...........................................................
Subdivisions of the Grenville Province ..............................................................................................
Central Gneiss Belt .....................................................................................................................................
Previous Work ............................................................................................................................................
Terminology................................................................................................................................................
1
2
2
4
5
5
6
Geology ...............................................................................................................................................................
Parautochthon .............................................................................................................................................
Britt Domain (Units 1 to 14)...............................................................................................................
Lower Go Home Domain (Units 15 to 18).........................................................................................
Allochthon...................................................................................................................................................
Shawanaga Domain (Units 19 to 24)..................................................................................................
Sand Bay Gneiss Association ....................................................................................................
Ojibway Gneiss Association ......................................................................................................
Upper Go Home Domain (Units 25 to 29) .........................................................................................
Pine Island Gneiss Association ..................................................................................................
Pere Brebeuf Gneiss Association...............................................................................................
Parry Sound Domain (Units 30 to 41) ................................................................................................
Parry Sound Domain (Basal) .....................................................................................................
Parry Sound Domain (Interior) ..................................................................................................
Moon River Subdomain (Units 42 to 46) ...........................................................................................
Twelve Mile Bay Gneiss Association ........................................................................................
Moon River Gneiss Association ................................................................................................
Blackstone Lake Gneiss Association .........................................................................................
Discussion ...................................................................................................................................................
Cross Section of Central Gneiss Belt Along Georgian Bay: from Active Margin to
Collisional Orogen .............................................................................................................................
Active Margin ............................................................................................................................
Collisional Orogen.....................................................................................................................
6
6
6
8
9
9
9
10
10
10
10
10
11
12
13
13
13
13
14
Economic Geology ..............................................................................................................................................
Overview.....................................................................................................................................................
Mineral Occurrences ...................................................................................................................................
Mineral Potential.........................................................................................................................................
Parautochthon.....................................................................................................................................
Allochthon ..........................................................................................................................................
Parry Sound Domain..................................................................................................................
16
16
16
17
17
17
17
References ...........................................................................................................................................................
17
Appendix 1. Listing of Published Geochronological Data for the Study Area....................................................
23
Metric Conversion Table .....................................................................................................................................
28
v
14
15
15
FIGURES
1.
Location of the Georgian Bay geological transect and map areas covered by this study............................
1
2.
Location of Central Gneiss Belt; domains are named .................................................................................
3
3.
Cross section of the Central Gneiss Belt along Georgian Bay ....................................................................
14
MAP(S)
Map P.3548
Precambrian Geology, Key Harbour Area ...................................................................
back pocket
Map P.3549
Precambrian Geology, Naiscoot Area..........................................................................
back pocket
Map P.3550
Precambrian Geology, Parry Sound Area ....................................................................
back pocket
Map P.3551
Precambrian Geology, Sans Souci Area ......................................................................
back pocket
Map P.3552
Precambrian Geology, Penetanguishene Area .............................................................
back pocket
vii
Abstract
The Grenville Orogen formed during collision of the Laurentian margin and related terranes with an
unknown, presumably continental, plate. The Central Gneiss Belt, together with the Grenville Front
tectonic zone, forms the structurally lowest part of the Grenville Orogen in central Ontario.
Metamorphism, deformation and minor magmatism related to the collision and convergence that formed
the Grenville Orogen are recorded in the Central Gneiss Belt during the interval 1160 to 1000 Ma.
Essentially, the Central Gneiss Belt consists of a stack of gently-dipping gneissic units (domains)
each of which has a distinctive lithological make-up, age of formation, and plutonic and metamorphic
history. On account of the highly strained nature of some of the domain boundaries and the evident
differences in pre-Grenville history of neighbouring domains, the domains have been interpreted as thrust
sheets. Structurally lower domains (polycyclic domains) contain evidence for a pre-Grenville
metamorphism, the overlying units (monocyclic domains) do not. The boundary separating the
polycyclic and monocyclic domains is termed the Allochthon Boundary Thrust. Several of the domains
are made up of subgroupings of consistently associated rock types known as gneiss associations. These
components of the domains are not usually separated by structures interpreted as thrusts, and their
assembly within the domains therefore predates thrust stacking of domains. Two features of the geology
of the Central Gneiss Belt are of special interest:
1. Because metamorphic grade is uniformly upper amphibolite facies or higher the Central Gneiss
Belt gives an unrivalled view of processes at mid-depth of a doubly thickened orogenic crust.
2. The similarity of ages and rocks types of the Central Gneiss Belt with those of the Central Plains,
Eastern Granite-Rhyolite Province and some southwest USA terranes has long been recognized.
Thus, together with these terranes, and much of the Grenville to the northeast, the Central Gneiss
Belt was part of a huge active continental margin formed during the Paleo- and Mesoproterozoic.
The well-exposed rocks of the Central Gneiss Belt offer insight into the development of this margin
before the Grenville Orogen formed.
ix
Georgian Bay Geological Synthesis, Grenville Province:
Explanatory Notes for Preliminary Maps P.3548 to P.3552
N.G. Culshaw1, D. Corrigan1, 2, J.W.F. Ketchum1, 3, P. Wallace1,
N. Wodicka1, 2 and R.M. Easton4
Ontario Geological Survey
Open File Report 6143
2004
1
Department of Earth Sciences, Dalhousie University, Halifax, Nova Scotia, Canada B3H 3J5
2
Now at Geological Survey of Canada, Ottawa, Ontario K1A OE8
3
Now at GEMOC ARC National Key Centre, Department of Earth and Planetary Sciences, Macquarie
University, NSW, 2109, Australia
4
Precambrian Geoscience Section, Ontario Geological Survey
Ministry of Northern Development and Mines, Sudbury, Ontario P3E 6B5
Introduction
This report is designed to provide additional information with respect to the content and design of Ontario
Geological Survey Preliminary Maps P.3548 to P.3552 (Culshaw et al. 2004a-e, back pocket), which
provide geological coverage of roughly 140 km of Georgian Bay shoreline from Key Harbour to Port
Severn (Figure 1).
The mapping results described in this report and on the aforementioned maps were collected as part
of a 3-year mapping program, Project C.2.3, Georgian Bay Geological Synthesis, funded as part of the
five-year Canada–Ontario 1985 Mineral Development Agreement (COMDA), a subsidiary agreement to
the Economic and Regional Development Agreement (ERDA) signed by the governments of Canada and
Ontario. The project was carried out in contract with the Geological Survey of Canada. Preliminary
results were published by Culshaw et al. (1988, 1989, 1990). Final publication of the maps (Ontario
Geological Survey Project 03-006) was assumed by the Ontario Geological Survey in 2003, by mutual
agreement with the Geological Survey of Canada.
Figure 1. Location of the Georgian Bay geological transect and map areas covered by this study.
1
OVERVIEW
The Grenville Province (or Grenville Orogen) was among the first parts of the Canadian Shield mapped in
Canada (Logan 1863, 1866), and the first discovery of gold in Ontario was made near Eldorado in 1866.
Considerable mapping was done in the Grenville Province in the late 19th century (e.g., Adams and
Barlow 1910), and study of the Grenville Province in Ontario contributed to many geologic concepts of
the time (Easton 1992). However, as the area became more populated and significant mineral finds were
made in northern Ontario, the economic impetus for geologic fieldwork in the Grenville Province
diminished. It also soon became apparent that the geology of the Grenville Province was complex. This
complexity discouraged many workers, and it is only recently that the study of Precambrian orogenic
belts has advanced to the point that we can now begin to unravel the geology of the Grenville Province
and to make meaningful comparisons with modern orogens.
The most complete recent summary of the Grenville Province in Ontario is that of Easton (1992).
Easton and Fyon (1992) and Carter (1984) have provided overviews of the metallogeny of the Grenville
Province in Ontario.
Regional Setting of the Grenville Province in North America
To understand the Grenville Province in Ontario, one must first place it in a regional tectonic setting.
Major geologic regions in the midcontinent of central North America are the Southern Province, the
Penokean Orogen, the Killarney Magmatic Belt, the Eastern Granite-Rhyolite Province, the Midcontinent
Rift System, and the Grenville Province.
Metasedimentary and minor metavolcanic rocks of the Huronian Supergroup of the Southern
Province underlie the southernmost Canadian Shield between Sault Ste. Marie and the Ottawa River
(Bennett, Dressler and Robertson 1991). These rocks were folded and metamorphosed during the circa
1835 Ma Penokean Orogeny (Bickford, Van Schmus and Zeitz 1986). The Huronian rocks southeast of
Sudbury are separated from the Grenville Front by plutonic and lesser volcanic rocks of the Killarney
Magmatic Belt (van Breemen and Davidson 1988), exposed along an 80 km stretch of the front along
Georgian Bay near Killarney, Ontario. These rocks intrude the Huronian Supergroup, and yield U/Pb
ages 1750 to 1730 Ma and 1470 to 1450 Ma (van Breemen and Davidson 1988). Southeast of the
Grenville Front, Killarney Magmatic Belt rocks have been affected by the Grenville Orogeny. The
Killarney granitoids have been interpreted (Easton 1986; van Breemen and Davidson 1988) to be an
extension of one of several Mesoproterozoic orogenic belts underlying much of the North American
midcontinent west of Ontario. As the northern limit of the Grenville Province is considered to be the
Grenville Front, the Killarney Magmatic Belt north of the Grenville Front is not part of the Grenville
Province (e.g., Easton 1992).
Felsic volcanic rocks and associated plutons of the Eastern Granite-Rhyolite Province form much of
the basement beneath the midcontinental United States west of the Grenville Front in southern Michigan,
Ohio, and Indiana. These rocks were emplaced between 1480 to 1420 Ma and circa 1350 Ma (Bickford,
Van Schmus and Zeitz 1986). Cutting this province is a northwesterly trending belt of gravity and
aeromagnetic anomalies interpreted to represent the buried portion of the 1100 Ma Midcontinent Rift
(Sutcliffe 1991).
The Grenville Front marks the northwest limit of penetrative Grenvillian metamorphism and
deformation and truncates structural trends in the adjacent structural provinces, although locally some of
these rocks can be traced across the Grenville Front for short distances (10 to 30 km, Easton 1992). It is
now generally accepted that this orogenic event (or events) involved northwest-directed thrusting and
imbrication of the entire crust, presumably as a result of a terminal collision at about 1100 Ma with a
2
continental landmass somewhere to the southeast (e.g., Rivers et al. 1989; Carr et al. 2000). Many Rb/Sr
and K/Ar ages in the Grenville Province range from 1000 to 950 Ma, synchronous with cooling after the
Grenville Orogeny. For the rocks exposed in the Grenville Province this paper uses major subdivisions as
originally proposed by Wynne-Edwards (1972), as revised by Easton (1992) (see Figure 2).
Figure 2. Location of Central Gneiss Belt; domains are named. Georgian Bay transect refers both to the area of shoreline
covered by this study, as well as the location of the cross-section shown in Figure 3. Abbreviations: GFTZ, Grenville Front
tectonic zone; CMBBZ, Central Metasedimentary Belt boundary zone; CMB, Central Metasedimentary Belt.
3
Subdivisions of the Grenville Province
Over the past 40 years, several approaches have been used to subdivide the Grenville Province into
lithologic and/or tectonic entities. The subdivision of the Grenville used here (Figure 2) has drawn from
several previous subdivisions in particular, Wynne-Edwards (1972), Davidson, Culshaw and Nadeau
(1982), and Easton (1992).
The Grenville Province in Ontario consists of 2 main divisions: the Central Gneiss Belt and the
Central Metasedimentary Belt (see Figure 2) (Wynne-Edwards 1972). The Grenville Front separates the
Grenville Province from older units to the north and northwest. That part of the Central Gneiss Belt that
lies within 20 to 30 km of the Grenville Front has been termed the Grenville Front tectonic zone (e.g.,
Wynne-Edwards 1972; Rivers et al. 1989). The zone consists of deformed and metamorphosed rocks
derived from the Southern and Superior Provinces and the Killarney Magmatic Belt and is characterized
by northeast-trending zones of cataclasis, northeast-trending foliations, and by a prominent southeastplunging lineation (Easton 1992).
The Grenville Front tectonic zone, which includes the Grenville Front Boundary Fault, and the
Central Metasedimentary Belt boundary zone, which separates the Central Gneiss Belt from the Central
Metasedsimentary Belt (see Figure 2), are major shear zones several kilometres in width, characterized by
strongly deformed rocks with northeasterly trending, moderately to shallowly southeast-dipping tectonic
layering, and southeast-plunging mineral lineations. Mylonites are locally developed. Marble tectonic
breccia, containing fragments of metasedimentary, plutonic, and amphibolite rocks is common within,
and adjacent to the eastern margin of the Central Metasedimentary Belt boundary zone. Significantly the
2 zones are subparallel in Ontario (see Figure 2). Similar subparallel zones of intense deformation on a
smaller scale form boundaries between lithotectonic terranes and domains within both the Central Gneiss
Belt and the Central Metasedimentary Belt (see Figure 2).
The Central Gneiss Belt and parts of the Central Metasedimentary Belt boundary zone, consist
mainly of quartzofeldspathic gneissic rocks that have generally been metamorphosed to upper
amphibolite facies, and locally to granulite facies. Most of these gneisses are believed to be plutonic in
origin, with subordinate amounts of metasedimentary gneiss. In Ontario, the dominant structures and
foliations in these rocks are northeasterly, and these trends are very evident on aeromagnetic maps of the
area. The Central Gneiss Belt consists of a variety of Archean to Mesoproterozoic crustal segments, all of
which have been affected by the Grenville Orogeny (Easton 1986, 1992). Crustal material of 3 main ages
is present (Easton 1986, 1992; Dickin and McNutt 1989). North of the French River, reworked Archean
and Paleoproterozoic gneisses are intruded by Mesoproterozoic (1250 to 1500 Ma) plutonic rocks, with
granitic and monzonitic rocks predominant. The bulk of the Central Gneiss Belt consists of
Mesoproterozoic gneisses (1600 to 1800 Ma) intruded by 1400 to 1500 Ma granitic and monzonitic
plutons. The Parry Sound domain (see Figure 2) consists of mafic to intermediate composition rocks
formed from at about 1350 to 1450 Ma (Dickin and McNutt 1989; Wodicka, Parrish and Jamieson 1996).
Distinctive lithotectonic terranes, some further subdivided into domains, have been identified with
the Central Gneiss Belt (e.g., Culshaw, Davidson and Nadeau 1983; Easton 1992) (see Figure 2). The
terranes and domains are distinguished by differences in their rock assemblages, internal structure,
metamorphic grade, and locally by geophysical signature. They are bounded by zones of intensely
deformed and sheared rocks characterized by layering that can be traced for many tens of kilometres. The
Central Gneiss Belt is described in greater detail in the next section of the report.
The Central Metasedimentary Belt lies southeast of the Central Gneiss Belt (see Figure 2), and is a
major Mesoproterozoic accumulation of metavolcanic and siliciclastic and carbonate metasedimentary
4
rocks. The supracrustal rocks comprise the classical Grenville Supergroup, which consists of a variety of
formations and groups, as outlined in Easton (1992). The supracrustal rocks have been invaded by a
variety of compositionally diverse syntectonic, late-tectonic, and post-tectonic plutonic rocks, and the
entire succession has been metamorphosed at grades ranging from greenschist to granulite facies. The
Central Metasedimentary Belt can be divided into several lithotectonic terranes characterized by
differences in lithology, geologic history, structural history, and ages of metamorphism and plutonism
(e.g., Easton 1992). The Elzevir and Bancroft Terranes, which include the Grenville Supergroup, are
characterized by volcanism and sedimentation between 1300 and 1250 Ma, followed by plutonism and
metamorphism at 1240 to 1250 Ma and again at 1100 to 1070 Ma. In contrast, the Frontenac Terrane
lacks volcanic rocks, and was subjected to plutonism and metamorphism at roughly 1170 to 1160 Ma.
CENTRAL GNEISS BELT
The Grenville Orogen formed during collision of the Laurentian margin and related terranes with an
unknown, presumably continental, plate. The Central Gneiss Belt (CGB), together with the Grenville
Front tectonic zone, forms the structurally lowest part of the Grenville Orogen in central Ontario.
Metamorphism, deformation and minor magmatism related to the collision and convergence that formed
the Grenville Orogen are recorded in the Central Gneiss Belt during the interval 1160 to 1000 Ma (see
Culshaw et al. (1997) and Carr et al. (2000) for further details).
Essentially, the Central Gneiss Belt consists of a stack of gently dipping gneissic units (domains)
each of which has a distinctive lithological make-up, age of formation, and plutonic and metamorphic
history. On account of the highly strained nature of some of the domain boundaries and the evident
differences in pre-Grenville history of neighbouring domains, the domains have been interpreted as thrust
sheets. Structurally lower domains (polycyclic domains) contain evidence for a pre-Grenville
metamorphism, the overlying units (monocyclic domains) do not (see Figure 2). The boundary separating
the polycyclic and monocyclic domains is termed the Allochthon Boundary Thrust (Rivers et al. 1989;
Ketchum and Davidson 2000). Several of the domains are made up of subgroupings of consistently
associated rock types known as gneiss associations. These components of the domains are not usually
separated by structures interpreted as thrusts and their assembly within the domains therefore predates
thrust stacking of domains. Two features of the geology of the Central Gneiss Belt are of special interest:
1. Because metamorphic grade is uniformly upper amphibolite facies or higher, the Central Gneiss
Belt gives an unrivalled view of processes at mid-depth of a doubly thickened orogenic crust.
2. The similarity of ages and rocks types of the Central Gneiss Belt with those of the Central Plains,
Eastern Granite-Rhyolite Province and some southwest USA terranes has long been recognized
(Easton 1986). Thus, together with these terranes, and much of the Grenville to the northeast, the
Central Gneiss Belt was part of a huge active continental margin formed during the Paleo- and
Mesoproterozoic. The well-exposed rocks of the Central Gneiss Belt offer insight into the
development of this margin before the Grenville Orogen formed.
PREVIOUS WORK
A traverse of the shore of Georgian Bay was made by Alexander Murray in 1848 (Murray 1850, p.45 to
46), and again by Robert Bell in 1876 (Bell 1878, p.198 to 207). The International Geological Congress
had a field excursion in the Parry Sound area in 1913, and examined some localities on Parry Island
(Walker 1913, p.98 to 100). Most previous work in the study area has focussed on the immediate area
surrounding Parry Sound, with Coleman (1894, p.98 to 100; Coleman 1899, p.259 to 260), Satterly
(1943) and Hewitt (1967) describing the geology and mineral occurrences of the Parry Sound area. More
5
recently, the Ontario Geological Survey published a series of 1:50 000 scale compilation maps for the
Muskoka domain and its environs (Lumbers and Vertolli 2000a-g). Of this series of maps, 3 sheets,
31D/13, 31E/4 and 31E/5 (Lumbers and Vertolli 2000c, 2000e, 2000g) overlap with parts of maps
P.3550, P.3551 and P.3552 (see back pocket).
Regional geological mapping of the western Central Gneiss Belt in Ontario by Davidson, Culshaw
and Nadeau (1982) and Culshaw, Davidson and Nadeau (1983) led to the recognition of the tectonic
significance of regional high-strain zones in the area, and established the basic tectonic framework of
terranes and domains that is utilized in this report (see Figure 2).
TERMINOLOGY
Terminology for all plutonic rocks in the area follows that of Streckeisen (1976). For metamorphic rocks,
mineral prefixes are listed in order of relative abundance, starting with least abundant first. Mineral
abbreviations follow Kretz (1983). The following conventions are used regarding descriptive adjectives.
A gneissic granite is a meta-igneous rock of granitic composition. A granitic gneiss, a granite gneiss, or
a gneiss of granitic composition may be either a meta-igneous or a metasedimentary rock. Similarly, a
tonalitic gneiss or a tonalite gneiss is a gneiss of tonalite modal composition, but may be of either metaigneous or metasedimentary origin. A gneissic meta-arkose is a metasedimentary gneiss of overall
granitic composition.
The term metamorphic grade is used in the case where bulk-rock composition or other factors
prevent a more detailed assignment of metamorphic conditions. Where metamorphic conditions can be
outlined more precisely, the metamorphic facies terminology of Turner (1981) is used.
Culshaw et al. (1988) introduced the concept of “gneiss associations” for mapping highly deformed
and metamorphosed rocks of the Central Gneiss Belt. A “gneiss association” is an informal stratigraphic
term that is primarily lithological, but which also may contain information with respect to plutonic
history, metamorphism or mafic diking. If it were decided to formally name a “gneiss association” as a
lithodemic unit under the North American Stratigraphic Code (NACSN 1983), in most cases, they would
correspond to a suite or a complex.
Geology
PARAUTOCHTHON
Britt Domain (Units 1 to 14)
The Britt domain has a considerable range of protolith ages, including circa 1800 to 1600 Ma granitic
orthogneiss cut by 1460 to 1430 Ma megacrystic granitoids (single cycle plutonic rocks). The polycyclic
nature of the Britt domain is clearly shown by the following relationship that is very common in the older
(1800-1600 Ma) group of gneisses: diabase dikes, deformed and metamorphosed in the Grenville
orogenic cycle, cut circa 1450 Ma leucosomes (Culshaw et al. 1989, Ketchum et al. 1994). The
metadiabase dikes have close affinities to the circa 1235 Ma northwest-striking Sudbury diabase dike
swarm on the Laurentian foreland (Ketchum and Davidson 2000). The range of U-Pb crystallization ages
as well as Nd model ages older than 1800 Ma (Dickin and McNutt 1989) clearly tie the gneisses to
6
undeformed rocks of comparable age in the US midcontinent (Easton 1986) and imply their Laurentian
affinity (Culshaw et al. 1997; Carr et al. 2000).
In the map area several recognizable rock associations comprise the Britt domain: the Bustard
Islands (unit 1), Key Harbour (units 2 to 5), Bayfield (units 6 to 8) and Nadeau Island (units 9 to 14)
gneiss associations. All the aforementioned gneiss associations may represent separate phases in the
evolution of an Andean-type arc and back-arc complex that formed at the southeastern continental margin
of Laurentia in 2 distinct stages of crustal growth at 1800 to 1600 Ma and 1460 to 1430 Ma (Carr et al.
2000; Slagstad 2003). Understanding the detailed significance of these groupings awaits further work.
The most prominent member of the Bustard Islands gneiss association is a medium-grained,
moderately foliated, migmatitic granodiorite-tonalite orthogneiss that contains many amphibolite lenses
and layers, probably metamorphosed mafic dikes. The age of the orthogneiss is not known but the
absence of a leucosome older than the dikes may imply a Mesoproterozoic age for the orthogneiss. This
interpretation is supported by presence in the area (but not indicated on Map P.3548, back pocket) of
lesser amounts of polycyclic gneiss with metadiabase dikes cutting older leucosomes.
The Key Harbour gneiss association is best exposed in the islands southwest of Key Harbour where
all the compositional varieties are exposed. The most extensive unit is a pink migmatitic granite
orthogneiss (unit 4) emplaced at circa 1690 Ma (Corrigan, Culshaw and Mortensen 1994). There are
undated tonalitic orthogneiss and metasedimentary rocks that predate the granite. Mafic gneiss
(metagabbro, monzodiorite)(unit 3), located south of Henvey Inlet to south of Byng Inlet, have been
included in the Key Harbour gneiss association although contact relations are unknown. It is possible
they are part of the Mesoproterozoic plutonic suite. Some metasedimentary rocks (unit 2) contain
corundum, in addition to kyanite and sillimanite, as in the Nadeau Island gneiss association (see below).
Along Highway 69 the Key Harbour gneiss association is represented by migmatitic layered grey gneisses
of varied character (unit 5). These may be related to the older tonalitic gneisses present near Key
Harbour. Monazite cooling ages of circa 1035 Ma (Corrigan, Culshaw and Mortensen 1994) are the best
estimate for the age of Grenvillian upper amphibolite facies metamorphism.
The most voluminous member of the Bayfield gneiss association is a grey hornblende-bearing
tonalitic orthogneiss (unit 7b). A granodiorite lacking hornblende, but commonly with recrystallised
potassium feldspar megacrysts (unit 7a), is part of the same suite and locally (e.g., Meneilly Island) has
patches partly retrogressed from granulite facies. Semi-pelitic and pelitic gneiss forms a mappable
horizon (unit 6) in the south, otherwise the Bayfield gneiss association is poor in metasedimentary rocks.
Pink leucocratic gneiss is a prominent member that is of potential supracrustal origin, and forms 2 large
bodies, centred on Bayfield and along the margin of the Britt pluton. There are comparable bodies of
pink leucocratic gneiss in most other domains along Georgian Bay and may represent one or more events
common to all domains (Culshaw and Dostal 2002).
The Nadeau Island gneiss association has more lithological variation than the Bayfield gneiss
association. The polycyclic orthogneiss in both gneiss associations are similar. There are, however, a
greater number of mappable metsedimentary intervals in the Nadeau Island gneiss association, and small
metasedimentary units (smaller than map scale) are common. In the north, close to Pointe-au-Baril
channel, there are occurrences of corundum-bearing metasedimentary rocks in the Bayfield gneiss
association. Small areas of preserved and partly retrogressed granulite facies rocks are relatively common
throughout the gneiss association. Good examples occur along Highway 69 where, within tonalitic
orthogneiss, mafic horizons contain relict orthopyroxene. Fresh mafic granulite occurs at Raspberry
Island. The age of the Mesoproterozoic metamorphism, including formation of the mafic granulites, is
estimated at 1450 to 1430 Ma (Tuccillo et al. 1992; Ketchum et al. 1998). Metasedimentary rocks
7
contain kyanite and sillimanite and Grenvillian metamorphic conditions are estimated at 700 to 800oC and
10 to 12 kbars (Ketchum et al. 1994)
The Britt domain is host to 2 intrusive complexes of Mesoproterozoic granitoid bodies. These
bodies (unit 50) are sheet-like, commonly megacrystic, and have emplacement ages of 1460 to 1430 Ma
(van Breemen et al. 1986; Corrigan, Culshaw and Mortensen 1994). In the Key Harbour gneiss
association the intrusive complex is dominated by the monzogranitic Britt pluton, but includes
granodiorite, granite, syenite and leucogabbro bodies. There are numerous small gabbroic bodies well
exposed in the islands near Key Harbour, one of which is dated at greater than 1454 Ma (Davidson and
van Breemen 2001), suggesting a potential link with the granitoid plutons. The Pointe-au-Baril intrusive
complex lies within the Nadeau Island gneiss association. The Pointe-au-Baril intrusive complex is
entirely granitoid, lacking the more extreme compositional varieties present near Key Harbour.
Pink leucocratic gneiss (unit 52), of the type found throughout the synthesis area, is present in the
Britt domain both as mappable units and as outcrops that are too small to map. Along Highway 69, pink
leucocratic rock demonstrably crosscuts pre-Grenvillian leucosome, but, for the most part, no clear age
relationship is demonstrable between pink leucocratic gneiss and the surrounding rocks.
The major structural features of the Britt domain are large horizontal upright folds with southeast
trending hinges. These folds generally deform an older Grenvillian fabric and have hinges parallel to a
lineation that indicates the direction of maximum extension. Although the enveloping surfaces of the
folds are gently dipping, the folds terminate in steep zones: for example, at the southeast margin of the
Grenville Front tectonic zone (around the Bustard Islands) and at the southeastern extremity of the Britt
Pluton, within the Bayfield gneiss association.
Lower Go Home Domain (Units 15 to 18)
The lower Go Home domain is dominated by Mesoproterozoic megacrystic granitoid rocks (circa
1460 Ma; T.E. Krogh, geochronologist, Jack Satterly Geochronology Laboratory, personal
communication, 1991). These, together with coronitic gabbro bodies and numerous other, minor mafic
bodies cut migmatitic granitoid gneisses that were likely emplaced at circa 1600 Ma (T.E. Krogh,
geochronologist, Jack Satterly Geochronology Laboratory, personal communication, 1991). There are
other units of unknown age, including strongly deformed metaplutonic rocks, as well as minor pelitic
gneisses and thin, but laterally extensive, marbles (Culshaw et al. 1990, 1997). The presence of the
Mesoproterozoic megacrystic granitoids cutting gneisses containing pre-granitoid leucosome is
comparable to relative age relationships observed in the Britt domain and establishes the lower Go Home
domain as part of the polycyclic, parautochthonous Laurentian craton (Culshaw et al. 1997; Carr et al.
2000).
The internal structure of the lower Go Home domain is marked by the presence of open, upright and
subhorizontal folds of gneissosity comparable to folds in other domains. The boundary relations with
overlying domains are complex. The boundary with the upper Go Home domain is marked by small
(commonly metre-scale) anorthosite gneiss bodies and garnet amphibolite pods of similar size that are in
places demonstrably retrogressed eclogites. Gneissosity above and below the boundary is concordant.
The boundary of the Moon River subdomain and the lower Go Home domain is comparable, being
marked by a continuous anorthosite sheet and several small (metre to centimetre scale) anorthosite bodies.
In several locations gneissosity is discordant across the boundary. The 2 boundaries meet in a triple point
on Highway 69, just south of the Moon River Bridge (see Map P.3551, back pocket), suggesting that the
upper Go Home domain pinches out southeastward beneath the Moon River subdomain.
8
ALLOCHTHON
Shawanaga Domain (Units 19 to 24)
The Shawanaga domain along Georgian Bay consists of a large nappe formed of the metasupracrustal
Sand Bay and metaplutonic Ojibway gneiss associations (Culshaw et al. 1989). The entire domain has
been metamorphosed to upper amphibolite facies, at greater than 700°C and 10 to 12 kbar (Wodicka,
Ketchum and Jamieson 2000). Deformation and high-grade polyphase metamorphism took place
between about 1090 and 1050 Ma (Culshaw et al. 1997; Wodicka, Ketchum and Jamieson 2000; Slagstad
2003). Unlike the Parry Sound and Britt domains there are no crosscutting mafic dikes in the Shawanaga
domain, but there are pods of retrogressed mafic eclogites of uncertain age (unit 54), and 1170 to
1150 Ma coronitic metagabbros (unit 53) (van Breemen and Davidson 1990).
The lower boundary of the Shawanaga domain, the Shawanaga shear zone, is a fundamental tectonic
feature, straddling the boundary of the monocyclic Shawanaga domain with the polycyclic rocks of the
Britt domain. The boundary, which can be precisely located on the islands of Georgian Bay, is the
westernmost extension of the Grenville orogen-wide Allochthon Boundary Thrust. Structures related to
thrusting are overprinted by extensional (top-to-the-southeast) deformation at circa 1020 Ma (Culshaw et
al. 1994; Ketchum et al. 1998) along the Shawanaga shear zone, and the initial thrust sense is indirectly
inferred from hanging wall – footwall relationships (e.g., high-pressure rocks are restricted to the hanging
wall), although rare thrust-sense kinematic indicators are found inland from Georgian Bay (Culshaw et al.
1989, 1994, 1997). Extension accompanied formation of upright folds, with hinge lines parallel to the
southeast-plunging stretching lineation (Culshaw et al. 1994). As with the correlative boundary in
between the upper and lower Go Home domains, retrogressed gabbroic eclogite and metre-scale
anorthosite blocks are locally associated with the Allochthon Boundary Thrust–Shawanaga shear zone.
SAND BAY GNEISS ASSOCIATION
The layered rocks of the Sand Bay gneiss association (Culshaw and Dostal 1997) include felsic
supracrustal orthogneiss, amphibolite and metasedimentary rocks. Sand Bay metasedimentary rocks
include quartzite, calc-silicate and semipelite. The semipelitic Dillon schist is a prominent marker unit
that outlines the fold structure of the domain. Early Paleoproterozoic to circa 1400 Ma ages have been
recorded from detrital zircons in a Sand Bay gneiss association quartzite (T.E. Krogh, geochronologist,
Jack Satterly Geochronology Laboratory, personal communication, 2003). The Dillon schist has yielded
zircon grains ranging from 1900±23 Ma to 1362±35 Ma, giving a maximum depositional age for the Sand
Bay gneiss association protoliths of circa 1360 Ma (Culshaw and Dostal 1997). The felsic supracrustal
orthogneisses are the most voluminous member. These are mostly pink, leucocratic, medium- to finegrained, equigranular migmatitic rocks interpreted as metarhyolites. Grey, more plagioclase-rich intervals
are also common. The best exposures of the Sand Bay gneiss association are along the west side of
Killbear peninsula (within the provincial park) and on the shoreline of Shawanaga Bay where it is
intersected by the syncline cored by Dillon Schist (the type section).
A geochemical study of the Sand Bay amphibolites and felsic orthogneisses suggested their
protoliths were bimodal volcanic rocks (Culshaw and Dostal 1997; Slagstad 2003). The major and trace
element geochemistry of the Sand Bay amphibolites resembles modern continental tholeiites, showing no
significant metamorphic disruption of diagnostic trace elements, for example, the high field strength
elements (Culshaw and Dostal 1997). The Sand Bay amphibolites have a prominent negative Nb
anomaly suggesting involvement of subduction-modified mantle in their genesis. High Th/La in the Sand
9
Bay amphibolites compared to modern mid-ocean ridge basalts (MORB) indicate the possibility of minor
crustal contamination. Sand Bay felsic orthogneisses have negative Eu, Ti and Nb anomalies compatible
with a continental crustal or arc origin. The igneous protoliths may have originated in a continental
environment undergoing active extension, perhaps a continental rift or continental arc-rift (back-arc or
intra-arc) setting (Culshaw and Dostal 1997; Slagstad 2003).
OJIBWAY GNEISS ASSOCIATION
The Ojibway gneiss association is a 1466±11 Ma orthogneiss body of granodioritic-tonalitic composition
with arc type granitoid geochemistry (T.E. Krogh, geochronologist, Jack Satterly Geochronology
Laboratory, personal communication, 2003). The sheet-like Shawanaga pluton lies along the lower
boundary of the Shawanaga domain. It is a circa 1460 Ma body of megacrystic garnet-amphibole-bearing
granodiorite-granite (T.E. Krogh, geochronologist, Jack Satterly Geochronology Laboratory, personal
communication, 2003). Compositional and age similarities between the Shawanaga pluton, Ojibway
gneiss, and grey calc-alkaline gneisses from the Muskoka domain to the south led Slagstad (2003) to
suggest that the Shawanaga pluton formed, along with the protoliths to the Ojibway and Muskoka gneiss
associations, in a postulated circa 1450 Ma Ojibway–Muskoka arc. The Ojibway–Muskoka arc formed
outboard of the Laurentian Britt domain, during the time that the latter underwent back-arc plutonism and
1450 to 1430 Ma granulite facies metamorphism (Ketchum et al. 1998).
Upper Go Home Domain (Units 25 to 29)
PINE ISLAND GNEISS ASSOCIATION
Leucosome-rich granitoid migmatite and pink leucocratic gneiss dominate the upper Go Home domain.
Calc-silicate gneiss is a minor component. The upper Go Home domain resembles parts of the
Shawanaga domain with respect to its tectonostratigraphic position and composition (e.g., migmatites of
the Ojibway gneiss association). The age and details of geochemistry of this domain are unknown. As
indicated above, the boundary with the lower Go Home domain is comparable to the lower boundary of
the Shawanaga domain. It separates monocyclic from polycyclic rocks and is therefore interpreted to be
the Allochthon-Parautochthon boundary thrust; however, unlike the Shawanaga shear zone, it is not
overprinted by extensive extensional shear fabrics
PERE BREBEUF GNEISS ASSOCIATION
This is a unit of apparently uniform grey, migmatitic tonalitic and granodioritic gneiss. Information is
scanty, but, on account of its uniformity and lack of associated rocks of definite supracrustal origin, it is
interpreted as an orthogneiss of plutonic protolith. It is tentatively distinguished from the adjacent lower
Go Home domain on account of lithological differences and because its boundaries, like those of the Pine
Island gneiss association, are associated with anorthosite gneiss.
Parry Sound Domain (Units 30 to 41)
Several thrust-separated, lithologically distinctive subunits with different protolith ages comprise the
Parry Sound domain. These are, from north to south, the predominantly supracrustal Lighthouse and
Armer Bay gneiss associations which comprise the circa 1400 to 1330 Ma basal Parry Sound domain and
10
the mostly plutonic, circa 1400 to 1200 Ma, interior Parry Sound domain (van Breemen et al. 1986;
Wodicka, Parrish and Jamieson 1996). The Parry Sound domain has experienced polyphase Grenvillian
metamorphism including pervasive granulite facies metamorphism. An early episode of granulite facies
Grenville metamorphism and deformation is recorded at 1160 to 1120 Ma, at least 40 million years before
the beginning of any other Grenvillian metamorphism in the remainder of the Central Gneiss Belt
(Culshaw et al. 1997). The allochthonous nature of the domain is demonstrated by the presence of
granulite facies metamorphic assemblages and the presence of mafic dikes in most rock types, neither of
which are present in the underlying Shawanaga or upper Go Home domains (Culshaw et al. 1989, 1997;
Wodicka, Parrish and Jamieson 1996).
PARRY SOUND DOMAIN (BASAL)
The basal Parry Sound domain consists of the Lighthouse and Armer Bay gneiss associations. The
Lighthouse gneiss association is thickest in the eastern part of Parry Island and severely thinned in the
vicinity of Highway 69. Culshaw and Dostal (2002), working in the vicinity of Bateau Island (the
western extremity of its outcrop), showed that the layered metamorphic rocks of the Lighthouse gneiss
association, like the subjacent Sand Bay gneiss association, are of volcano-sedimentary origin. On Parry
Island the supracrustal members are interlayered with a second grouping of supracrustal rocks (mostly
quartzite) and tonalite-granodiorite orthogneiss that are cut by metamorphosed mafic dikes. The diked
rocks are thus older than the volcano-sedimentary package and the interlayering of 2 gneiss associations
must be tectonic in origin.
The volcano-sedimentary Lighthouse gneiss association is dominated by amphibolite and semipelitic
to pelitic metasedimentary rocks divided, in the western study area of Culshaw and Dostal (2002), into
geochemically and lithologically distinctive upper and lower units. The lower unit amphibolite has a
basaltic tholeiite major element composition and a trace element signature resembling oceanic basalt with
a minor subduction zone or subduction-modified mantle influence, similar to Sand Bay amphibolite
geochemistry (Culshaw and Dostal 2002). The amphibolites of the upper unit have no negative Nb
anomaly and have trace element ratios similar to mid-ocean ridge basalt (MORB); therefore, they are
likely to have formed from the depleted mantle (Culshaw and Dostal 2002). This evidence and isotopic
work in progress suggests the tectonic development of these rocks may be linked to that of both the
Shawanaga and the Parry Sound domains. The age of the diked suite is constrained by the 1436±17 Ma
age of the youngest detrital zircon in quartzite and the circa 1400 to 1330 Ma age of the orthogneisses
(Wodicka, Parrish and Jamieson 1996). It shares detrital ages with parts of the Composite Arc Belt
(better known as the Central Metasedimentary Belt; Carr et al. 2000) and the Adirondack Highlands
(Wodicka, Parrish and Jamieson 1996). The Lighthouse gneiss association is best observed on the west
side of Sandy Island (see Culshaw and Dostal (2002) for location of measured sections).
Para-amphibolites (unit 34) are the dominant member of the Armer Bay gneiss association, the
thickest member of the basal Parry Sound assemblage on the mainland. It is distinguishable from the
Lighthouse gneiss association by differences in the interlayered metasedimentary rocks (generally
sulphide bearing in Armer Bay). The geochemistry and geochronology of this unit is unknown, but, on
the basis of proximity and physical similarity, it is most likely similar in both aspects to the Lighthouse
gneiss association.
The contact between the Armer Bay and Lighthouse can be directly observed along the shoreline at
Parry Sound where gneissosity in the 2 units is conformable but evidently highly strained. This contact is
therefore either primary, tectonic, or both.
11
The circa 1160 Ma (Wodicka, Parrish and Jamieson 1996) Parry Island anorthosite lies within the
basal Parry Sound domain on Parry Island, and, presumably, anorthosite that underlies the offshore
islands is part of this body. A circa 1350 Ma anorthosite (van Breemen et al. 1986) flanked by a young
(lacking mafic dikes) megacrystic granitoid lies within the Armer Bay gneiss association on Parry Island
and the mainland.
PARRY SOUND DOMAIN (INTERIOR)
The interior Parry Sound domain consists of Mesoproterozoic (circa 1400-1200 Ma) granulite facies
metaplutonic rocks ranging from gabbro to granite, with subordinate metasedimentary rocks. The most
important metaplutonic members appear to be intermediate in composition (spanning granodioritetonalite-quartz diorite). The overall range of orthogneiss compositions, from tonalitic, granitic and
granodioritic gneiss to gabbro, suggests a calc-alkaline arc suite. Nd model ages of 1500 to 1400 Ma
(Dickin and McNutt 1990) are close to crystallization ages and suggest these rocks formed from a
juvenile source. Detailed petrography and geochemistry of these rocks are unknown. Metamorphosed
mafic dikes cut all the rocks of the interior, further distinguishing them from rocks of the Shawanaga and
upper Go Home domains.
The northwestern boundary of the Parry Sound domain interior with the underlying Armer Bay
gneiss association is marked for most of its strike length by the Whitestone anorthosite. A northward
transect along Highway 69 (or more lightly travelled roads parallel to it) affords a view of the progressive
modification of the granulite facies L-S fabric typical of the interior of the domain through a wide zone of
retrogression (not shown on maps), to development of linked shear zone systems and penetrative mylonite
gneiss close to the boundary. Pegmatite bodies are very common along this transect and appear to be
linked to extensional structures that deform the mylonitc fabrics.
This boundary is usually viewed as lying within the upper part of the Parry Sound shear zone
(PSSZ), which may be thought of as a wide zone of elevated strain extending downward from top of the
first shear zones within the interior Parry Sound domain to the top of the Shawanaga domain. Davidson
and others (e.g., Davidson, Culshaw and Nadeau 1982; Culshaw, Davidson and Nadeau 1983; Davidson
1984a, 1984b) describe tectonites from several classic localities. This definition of the Parry Sound shear
zone requires modification on Parry Island, where there are wide expanses from which the tectonites
typical of the Parry Sound shear zone are absent. Moreover, a case can be made that tectonites considered
typical of the Parry Sound shear zone are present within the Shawanaga domain well below the rocks
normally thought of as lying within the Parry Sound shear zone thus bringing into question the location of
a lower boundary to the Parry Sound shear zone. Whether or not the concept of a Parry Sound shear zone
in terms of highly strained tectonites is useful as a first order tectonic feature, it seems clear that
boundaries between allochthonous units are recognizable and persistent along strike and should be
accorded due tectonic significance.
The southern boundary of the Parry Sound domain is problematic. This is in part because of
uncertainty in precise knowledge of the protoliths at the boundary and in part because of the complex and
unusual geometry of the boundaries. For example, there is field evidence that the protolith of parts of the
Blackstone Lake gneiss association was a Parry Sound domain lithology. Secondly, the geometry of the
boundary, as outlined by the map traces of the anorthosite sheets associated with the Twelve Mile Bay
gneiss association and Moon River subdomain, is not easily explained. What can be stated, based on field
observation, is that the approach to this boundary from the Parry Sound domain side is accompanied by
progressive retrogression of the granulite facies assemblages. In this respect, at least, it resembles the
boundary of the Parry Sound domain.
12
Moon River Subdomain (Units 42 to 46)
The Moon River subdomain consists of the Twelve Mile Bay, Moon River and Blackstone Lake gneiss
associations. These lithological units, together with retrogressed gneisses in the south of the Parry Sound
interior (southeast of the retrogression boundary) make up the system of late synforms referred to here as
the Moon River structure. It is important to note that this structure consists of more than one
lithologically defined domain and therefore postdates thrust stacking of the domains.
TWELVE MILE BAY GNEISS ASSOCIATION
The Twelve Mile Bay gneiss association (termed assemblage in some older publications) is a thin
quartzite, pelite, semipelite and amphibolite unit (unit 44) dominated by 2 extensive sheets of anorthosite
gneiss (unit 47) (Culshaw et al.1989). An age of less than 1130 Ma for the quartzite has been suggested
based on zircon data (Wodicka, Parrish and Jamieson 1996). At its western end the Twelve Mile Bay
gneiss association directly underlies the Parry Sound domain interior and it has been suggested to be
physically continuous with the Lighthouse gneiss association of the basal portion of the Parry Sound
domain, which it resembles (Culshaw et al. 1989). As indicated above, it has, however, a complex
geometry: a lower anorthosite sheet extends southeastward at the contact of the base of the Moon River
gneiss association with the Go Home domain. The upper anorthosite, together with the metasedimentary
horizons diverges from the lower anorthosite, swinging northwest then northeast around the base of the
Moon River gneiss association. This arm of the Twelve Mile Bay gneiss association becomes extremely
attenuated (to centimetre thickness) along the northwestern and northeastern contact of the Moon River
gneiss association.
MOON RIVER GNEISS ASSOCIATION
The Moon River gneiss association consists of rocks separated from subjacent units by extensions of the
Twelve Mile Bay gneiss association. Prominent among the latter are the persistent horizons of
anorthosite gneiss (unit 47). The most important members are uniform pink and grey, generally
leucocratic and layered gneisses (unit 45 and 46) in which evidence for plutonic origin, such as deformed
megacrysts, is lacking. Minor members include quartzite and para-amphibolite (unit 44). Given the
textural nature of the major gneiss members, their similarity with leucocratic gneisses of the Sand Bay
gneiss association and their association with minor but definitively metasupracrustal rocks, volcanic
protoliths are plausible. However, this cannot be stated with certainty for all members mainly because the
gneisses are very structurally evolved. The layered gneissosity that defines the Moon River synform also
outlines a refolded nappe (van Berkel and Schwerdtner 1986) and locally can be shown to have been
derived by transposition of an older gneissosity. Nd model ages (Dickin and McNutt 1989) demonstrate
these rocks are juvenile crust. Small bodies of coronitic gabbro (unit 53) lie along the boundary.
BLACKSTONE LAKE GNEISS ASSOCIATION
Grey gneisses of granodioritic composition (unit 43b) together with pink leucocratic gneisses (unit 43a),
similar to pink gneisses of other domains, are the chief components of the gneiss association. There is
local evidence for derivation from Parry Sound rock types but the nature of protolith of the Blackstone
Lake gneiss association remains in question. The Blackstone Lake gneiss association has a sheared
boundary with local discordance against Parry Sound foliations beneath. A major point of uncertainty is
the nature of the relationship of Blackstone rock types with retrogressed Parry Sound gneisses at the
13
southwestern extremity and southern boundary of the gneiss association. These are shown on the maps
(P.3550 and P.3551, see back pocket) as sharp boundaries but these boundaries should be viewed with
scepticism.
DISCUSSION
Cross Section of Central Gneiss Belt Along Georgian Bay: from
Active Margin to Collisional Orogen
The restored cross section of the Central Gneiss Belt (Figure 3) illustrates some aspects of current views
of its development. Before the Grenville Orogeny the future thrust sheets of the Central Gneiss Belt were
arranged younging oceanward from cratonic Laurentia. The validity of this restoration is supported in
that it also places units with similar, but distinctive minor plutonic units (e.g., anorthosite, coronitic
gabbro) alongside one another (see Figure 3).
Figure 3. Cross section of the Central Gneiss Belt along Georgian Bay. Figure based on geology and seismic reflection profiles;
sources can be found in Culshaw et al. (1997). a. postulated arrangement of domains before collision. b. postulated arrangement
of domains after collision, convergence and mid-level crustal flow. Abbreviations: lPS, lower Parry Sound domain (now Parry
Sound shear zone); GFTZ, Grenville Front tectonic zone; M, Moho; SH, Shawanaga domain; PSD, Parry Sound domain; lGH RA, lower Go Home domain – Rosseau domain; MR–MS, Moon River domain–Muskoka domain; CMBBZ, Central
Metasedimentary Belt boundary zone; CMB, Central Metasedimentary Belt; L.GH, lower Go Home domain; U.GH, upper Go
Home domain.
14
ACTIVE MARGIN
The pre-Grenvillian configuration of the Laurentian margin was arrived at by successive magmatic
additions to the periphery of a simple Andean-type margin. At first the arcs, being close to the craton,
included considerable volumes of older Laurentian crust. These were later metamorphosed at ~1450 Ma
and ultimately became the polycyclic domains of the Grenville Orogen. The proportion of older
Laurentian crust diminishes and then vanishes in the younger, more outboard arcs. These are the
monocyclic domains. This simple (suspiciously more simple than the Andes!) arrangement of arcs is
complicated by the presence within the arcs of rock types indicating intra- or back-arc rifting or distal
back-arc bimodal magmatism with significant A-type plutonism. For example, calc-alkaline arc rocks of
Shawanaga domain are associated with amphibolites and felsic gneisses of the Sand Bay gneiss
association interpreted to represent the magmatic products (basalts and rhyolites, respectively) of rifting
of the same arc. Another example is given by the ~1450 Ma plutons of the Britt domain (e.g., Britt
pluton) that are interpreted to have been emplaced far behind the active arc into an older arc. As these
examples suggest, further complications to the simple oceanward-younging hypothesis will probably
emerge as a result of future studies.
COLLISIONAL OROGEN
In the current model, the present configuration of the Central Gneiss Belt was derived from the
oceanward-younging version of the Laurentian margin by classic forward-propagating thrusting with
minimum out-of-sequence thrusting in combination with pervasive ductile flow. Although, the case for
thrust-stacking can be made on the basis of lithostratigraphy alone, it has also been argued that most of
the boundaries of the domains are discrete thrust-sense shear zones. They may have high-strain structures
such as sheath folds, a variety of kinematic indicators and, in some cases, boundaries of overlying units
truncating structures below.
However, a simple model based on foreland fold-and-thrust belts is clearly inappropriate. This is
because most of the thrust-stacked domains, unlike high-level thrust sheets, consist of planar bodies of
gneiss formed during one or more episodes of ductile flow that affected entire thrust sheets (Culshaw et
al. 1997). The gneiss within the thrust sheet may comprise layered straight gneiss (often migmatitic) or
leucosome-rich migmatite with a well-developed planar fabric and a variety of high-strain features (e.g.,
isoclinal folds). The elevated level of ductile deformation required to make such straight gneiss is
demonstrated locally where strain gradients preserve different stages of its formation from original,
sometimes irregularly shaped, compositional heterogeneities. Repetition of this level of deformation is
shown where straight gneiss is transposed a second time (kneading) or folded by domain-scale nappes
that are, in turn, refolded. That the conditions appropriate for such ductile flow persisted over a
considerable period is shown by widespread upper amphibolite to granulite facies conditions and
generation of migmatite and U/Pb ages that suggest high-grade metamorphism was attained more or less
continuously for about 50 million years. Having established that thrust stacking and pervasive ductile
flow of the thrust stack both took place, the question of the relative timing and nature of the relationship
of the 2 phenomena remains. Did they occur simultaneously or were they separated in time?
15
Economic Geology
OVERVIEW
Little modern mineral exploration has been conducted within the Central Gniess Belt, in part because of
the perception that high-grade gneiss terranes have little mineral potential. Lack of detailed geologic
maps and mineral deposit models have also discouraged mineral exploration. Nevertheless, our
understanding of the tectonic architecture of the region allows establishment of a broad framework for
mineral exploration within the Central Gneiss Belt (see also Easton and Fyon 1992). For example,
flagstone is a major commodity that is not domain specific, as the best flagstone prospects are found in
transposed and straight gneiss zones associated with terrane or domain boundaries. Also associated with
terrane or domain boundaries are circa 1170 million-year-old mafic and ultramafic bodies (metabasites
and pseudoecologites) which have recently been explored for platinum group element, copper and gold
mineralization (Garland and Villard 1990).
MINERAL OCCURRENCES
Maps P.3548 to P.3552 (see back pocket) include all known metallic and nonmetallic Mineral Deposit
Inventory (MDI) occurrences within the study area. Examination of specific mineral occurrences and
prospects was not a focus of the study or the mapping program. With few exceptions, the MDI
occurrences are localized into 5 geographic groups.
1. Occurrences near Britt Station (see Map P.3548) associated with pegmatite veins in or adjacent to
the Still River gneiss association (unit 5). These occurrences have been examined for feldspar,
uranium, rare elements, and columbite. To date, no significant mineralization has been found.
2. Occurrences located within the interior of Parry Sound domain (see Maps P.3550 and P.3551).
Villard, Keevil and Hogg (1984) summarized these occurrences, many of which may contain minor
amounts of gold. Most are associated with quartz veins, and contain varied amounts of
chalcopyrite, pyrite and pyrrhotite, which are generally the minerals reported in MDI. The veins are
spatially associated with metamorphosed quartz diorite bodies surrounded by mafic gneisses.
3. Occurrences of flagstone producing and past-producing quarries in the Parry Sound shear zone (see
Map. P.3350). Marmont (1991) summarized the flagstone potential within the western Central
Gneiss Belt of Ontario.
4. Occurrences located east of Blackstone Lake and near Mactier (see Map. P.3551) are associated
with pegmatite veins hosted by leucogneiss (unit 43) of the Blackstone Lake gneiss association, in
close proximity to mafic rocks of the anorthosite suite (unit 47). These occurrences were examined
for feldspar, uranium, rare elements, and columbite between 1910 and 1925 (Hewitt 1967). To
date, no significant mineralization has been found. Proximity to the Canadian Pacific railway
right-of-way was probably a major factor in the initial examination of these occurrences.
5. Occurrences in the vicinity of Six Mile Lake Provincial Park (see Map P.3552) that are associated
with rusty schists and marble horizons in the Honey Harbour gneiss association of the lower Go
Home domain. Mineralization consists of graphite and minor gold and sulphide occurrences.
Easton (1995) describes these occurrences, including several not included within MDI.
16
MINERAL POTENTIAL
Parautochthon
Few mineral occurrences have been reported from rocks of the parautochthon. The polycyclic character
of the rocks present in the parautochthon, in conjunction with the abundance of felsic, moncyclic plutonic
rocks, suggests that this part of the study area has limited mineral potential. The exception to this
assessment may be the metasedimentary rocks of the lower Go Home domain, which host minor graphite,
gold and sulphide occurrences (Easton 1995).
Allochthon
Apart from the Parry Sound domain, which is described below, few mineral occurrences have been
reported from rocks of the allochthon. The presence of metasedimentary rocks within much of
Shawanaga domain, as well as the presence of both mafic and felsic metavolcanic rocks of continental
affinity in this domain (Culshaw and Dostal 1997, 2002) suggest that Shawanga domain might have a
higher mineral potential than previously thought. Commodities of interest are volcanogenic massive
sulphide deposits (VMS) and sedimentary-hosted (SEDEX) base metal deposits.
PARRY SOUND DOMAIN
The abundance of mafic rocks and carbonate and pelitic gneisses in the Parry Sound domain makes this
region the most extensively prospected and the best exploration target in the Central Gneiss Belt. Villard,
Keevil and Hogg (1984) summarized the numerous gold prospects in the area. Most are associated with
quartz veins, and contain associated chalcopyrite, pyrite and pyrrhotite, and are spatially associated with
metamorphosed quartz diorite bodies surrounded by mafic gneisses. Two vein types are documented:
(1) copper-gold-bearing veins in gabbroic rocks in mafic gneiss; and (2) copper-nickel- and copper-zincbearing veins in the contact zone between felsic and mafic gneiss. Minor past production was achieved
from a few deposits (Satterly 1943; Garland and Villard 1990). Northeast of the study area, small bodies
of massive magnetite occur in Lount Township within garnet-hornblende gneiss and may represent
disaggregated or disrupted iron formation (Easton and Fyon 1992).
The industrial mineral potential of the Parry Sound domain is high, and includes alumina sources
(mainly meta-anorthosite; Marmont 1988a), agricultural lime from marbles (Marmont 1988b), building
stone (Marmont 1991) and flagstone (Fouts and Marmont 1989). The best flagstone quarries are located
in the Parry Sound shear zone.
References
Adams, F.D. and Barlow, A.E. 1910. Geology of the Haliburton and Bancroft area, Province of Ontario; Geological
Survey of Canada, Memoir 6, 419p.
Bell, R. 1878. Report on geological researches north of Lake Huron and east of Lake Superior; in Geological Survey
of Canada, Report on Progress 1876-77.
17
Bennett, G., Dressler, B.O., and Robertson, J.A. 1991. The Huronian Supergroup and associated intrusive rocks; in
Geology of Ontario, Chapter 14, Ontario Geological Survey, Special Volume 4, pt.1, p.549-591.
Bickford, M.E., Van Schmus, W.R. and Zeitz, I. 1986. Proterozoic history of the midcontinent region of North
America; Geology, v.14, p.492-496.
Bussy, F., Krogh, T.E., Klemens, W.P. and Schwerdtner, W.M. 1995. Tectonic and metamorphic events in the
westernmost Grenville Province, central Ontario: new results from high-precision U-Pb zircon geochronology;
Canadian Journal of Earth Sciences, v.32, p.660-671.
Carr, S.D., Easton, R.M., Jamieson, R.A., and Culshaw, N.G. 2000. Geologic transect across the Grenville Orogen
of Ontario and New York; Canadian Journal of Earth Sciences, v.37, p.193-216.
Carter, T.R., 1984. Metallogeny of the Grenville Province, southeastern Ontario; Ontario Geological Survey, Open
File Report 5515, 422p.
Coleman, A.P. 1894. Gold in Ontario: its associated rocks and minerals; in Ontario Bureau of Mines, v.4., p.35-100.
Coleman, A.P. 1899. Copper in Parry Sound district; in Ontario Bureau of Mines, v.8., p.259-262.
Connare, K.M. and McNutt, R.H. 1985. Rb-Sr geochronology of the Nobel gneiss and McKellar gneiss, Parry
Sound region, Ontario; in Current Research, Part A, Geological Survey of Canada Paper 85-1A, p.175-180.
Corrigan, D., Culshaw, N.G. and Mortensen, J.K. 1994. Pre-Grenvillian evolution and Grenvillian overprinting of
the Parautochthonous Belt in the Key Harbour area, Ontario: U-Pb constraints; Canadian Journal of Earth
Sciences, v.31, p.583-596.
Cosca, M.A. 1989. Cooling and inferred uplift/erosion history of the Grenville Orogen, Ontario: constraints from
Argon-40/Argon-39; unpublished Ph.D. thesis, University of Michigan, Ann Arbor, Michigan, 223p.
Culshaw, N.G., Check, G., Corrigan, D., Drage, J., Gower, R., Haggart, M.J., Wallace, P. and Wodika, N. 1989.
Georgian Bay geological synthesis: Dillon to Twelve Mile Bay, Grenville Province of Ontario; in Current
Research, Part C, Geological Survey of Canada, Paper 89-1C, p.157-163.
Culshaw, N.G., Corrigan, D., Drage, J. and Wallace, P. 1988. Georgian Bay geological synthesis: Key Harbour to
Dillon, Grenville Province of Ontario; in Current Research, Part C, Geological Survey of Canada, Paper 881C, p.129-133.
Culshaw, N.G., Corrigan, D., Ketchum, J.W.F., and Wallace, P. 1990. Georgian Bay geological synthesis: Twelve
Mile Bay to Port Severn, Grenville Province of Ontario; in Current Research, Part C, Geological Survey of
Canada, Paper 90-1C, p.107-112.
Culshaw, N.G., Corrigan, D., Ketchum, J.W.F., Wallace, P. and Wodicka, N. 2004a. Precambrian geology of the
Key Harbour area; Ontario Geological Survey, Preliminary Map P.3548, scale 1:50 000.
Culshaw, N.G., Corrigan, D., Ketchum, J.W.F., Wallace, P. and Wodicka, N. 2004b. Precambrian geology of the
Naiscoot area; Ontario Geological Survey, Preliminary Map P.3549, scale 1:50 000.
Culshaw, N.G., Corrigan, D., Ketchum, J.W.F., Wallace, P. and Wodicka, N. 2004c. Precambrian geology of the
Parry Sound area; Ontario Geological Survey, Preliminary Map P.3550, scale 1:50 000.
Culshaw, N.G., Corrigan, D., Ketchum, J.W.F., Wallace, P. and Wodicka, N. 2004d. Precambrian geology of the
Sans Souci area; Ontario Geological Survey, Preliminary Map P.3551, scale 1:50 000.
18
Culshaw, N.G., Corrigan, D., Ketchum, J.W.F., Wallace, P. and Wodicka, N. 2004e. Precambrian geology of the
Penetanguishene area; Ontario Geological Survey, Preliminary Map P.3552, scale 1:50 000.
Culshaw, N.G., Davidson, A. and Nadeau, L. 1983. Structural subdivisions of the Grenville Province in the Parry
Sound-Algonquin region, Ontario; in Current Research, Part B, Geological Survey of Canada, Paper 83-1B,
p.243-252.
Culshaw, N. and Dostal, J. 1997. Sand Bay gneiss association, Grenville Province, Ontario: a Grenvillian rift- (and
-drift) assemblage stranded in the Central Gneiss Belt?; Precambrian Research, v.85, p.97-113.
Culshaw, N. and Dostal, J. 2002. Amphibolites of the Shawanaga domain, Central Gneiss Belt, Grenville Province,
Ontario: tectonic setting and implications for relations between the Central Gneiss Belt and midcontinental
USA; Precambrian Research, v.113, p.65-85.
Culshaw, N.G., Jamieson, R.A., Ketchum, J.W.F., Wodicka, N., Corrigan, D. and Reynolds, P.H. 1997. Transect
across the northwestern Grenville orogen, Georgian Bay, Ontario: Polystage convergence and extension in the
lower orogenic crust; Tectonics, v.16, p.966-982.
Culshaw, N.G., Ketchum, J.W.F., Wodicka, N. and Wallace, P. 1994. Ductile extension following thrusting in the
deep crust: Evidence from the southern Britt Domain, southwest Grenville Province, Georgian Bay, Ontario;
Canadian Journal of Earth Sciences, v.31, p.160-175.
Culshaw, N. Reynolds, P.H. and Check, G. 1991. A 40Ar/39Ar study of post-tectonic cooling in the Britt domain of
the Grenville Province, Ontario; Earth and Planetary Science Letters, v.105, p.405-415.
Cumming, G.L., Wilson, J.T., Farquhar, R.M. and Russell, R.D. 1955. Some dates and subdivisions of the Canadian
Shield; Geological Association of Canada, Proceedings, v.7, p. 27-79.
Davidson, A. 1984a. Identification of ductile shear zones in the southwestern Grenville Province of the Canadian
Shield; in Precambrian Tectonics Illustrated, E. Schweizerbart'sche Verlagsbuchhandlung, Stuttgart, p.263279.
Davidson, A. 1984b. Tectonic boundaries within the Grenville Province of the Canadian Shield; Journal of
Geodynamics, v.1, p.433-444.
Davidson, A., Culshaw, N.G. and Nadeau, L. 1982. A tectono-metamorphic framework for part of the Grenville
Province, Parry Sound region, Ontario; in Current Research, Part A, Geological Survey of Canada, Paper 821A, p.175-190.
Davidson, A. and van Breemen, O. 1994. U-Pb ages of granites near the Grenville Front, Ontario; in Radiogenic
Age and Isotopic Studies: Report 8; Geological Survey of Canada Paper 94-F, p.107-114.
Davidson, A. and van Breemen, O. 2001. Baddeleyite U-Pb age of metadiabase near Key Harbour, Britt domain,
Grenville Province, Ontario; in Radiogenic age and isoptopic studies 14, Geological Survey of Canada, Current
Research, Paper 2001-F7, 11p. (available in electronic form only)
Dickin, A.P. and McNutt, R.H. 1989. Nd model age mapping of the southeast margin of the Archean foreland in the
Grenville Province of Ontario; Geology, v.17, p.299-303.
Dickin, A.P. and McNutt, R.H. 1990. Nd model-age mapping of Grenville lithotectonic domains: mid-Proterozoic
crustal evolution in Ontario; in Mid-Proterozoic Laurentia–Baltica, Geological Association of Canada, Special
Paper 38, p.79-94.
Easton, R.M. 1986. Geochronology of the Grenville Province; in The Grenville Province, Geological Association of
Canada, Special Paper 31, p.127-173.
19
Easton, R.M. 1992. The Grenville Province; in Geology of Ontario, Chapter 19, Ontario Geological Survey, Special
Volume 4, pt.2, p.713-904.
Easton, R.M. 1995. Paleozoic faulting and alteration in the Go Home domain, Grenville Province; in Summary of
Field Work and Other Activities 1995, Ontario Geological Survey, Miscellaneous Paper 164, p.31-33.
Easton, R.M. and Fyon, A.J. 1992. Metallogeny of the Grenville Province; in Geology of Ontario, Chapter 24,
Ontario Geological Survey, Special Volume 4, Part 2, p.1216-1252.
Fouts, C.F. and Marmont, C. 1989. Gneisses of the Parry Sound–Muskoka area: Flagstone resources; Ontario
Geological Survey, Open File Report 5725, 72p.
Garland, M.I. and Villard, D.J. 1990. Algonquin Resident Geologist's District—1990; in Report of Activities 1990,
Resident Geologists, Ontario Geological Survey, Miscellaneous Paper 152, p.293-299.
Heaman, L.M. and LeCheminant, A.N. 1993. Paragenesis and U-Pb systematics of baddeleyite (ZrO2); Chemical
Geology, v.110, p.95-126.
Hewitt, D.F. 1967. Geology and mineral deposits of the Parry Sound–Huntsville area; Ontario Department of Mines,
Geological Report 52, 65p.
Ketchum, J.W.F. and Davidson, A. 2000. Crustal architecture and tectonic assembly of the Central Gneiss Belt,
southwestern Grenville Province, Canada: a new interpretation; Canadian Journal of Earth Sciences, v.37,
p.217-234.
Ketchum, J.W.F., Heaman, L.M., Krogh, T.E., Culshaw, N.G. and Jamieson, R.A. 1998. Timing and thermal
influence of late orogenic extension in the lower crust: a U-Pb geochronological study from the southwest
Grenville orogen, Canada; Precambrian Research, v.89, p.25-45.
Ketchum, J.W.F., Jamieson, R.A., Heaman, L.M., Culshaw, N.G. and Krogh, T.E. 1994. 1.45 Ga granulites in the
southwestern Grenville Province: geologic setting, P-T conditions, and U-Pb geochronology; Geology, v.22,
p.215-218.
Ketchum, J.W.F. and Krogh, T.E. 1997. U-Pb constraints on high-pressure metamorphism in the Central Gneiss
Belt, southwestern Grenville orogen; Geological Association of Canada – Mineralogical Association of
Canada, Abstract Volume, v.22, p.A-78.
Kretz, R. 1983. Symbols for the rock-forming minerals; American Mineralogist, v.68, p.277-279.
Krogh, T.E. and Davis, G.L. 1969. Geochronology of the Grenville Province; Carnegie Institution of Washington,
Yearbook 67, p.224-230.
Krogh, T.E. and Davis, G.L. 1970a. Metamorphism 1700±100 m.y. and 900±100 m.y. ago in the northwest part of
the Grenville Province in Ontario; Carnegie Institution of Washington, Yearbook 68, p.308-309.
Krogh, T.E. and Davis, G.L. 1970b. Isotopic ages along the Grenville Front in Ontario; Carnegie Institution of
Washington, Yearbook 68, p.309-313.
Krogh, T.E. and Davis, G.L. 1971. Paragneiss studies in the Georgian Bay area 90 km southeast of the Grenville
Front; Carnegie Institution of Washington, Yearbook 69, p.339-341.
Logan, W.M. 1863. Report on the geology of Canada; Geological Survey of Canada, Report of Progress from its
Commencement to 1863, 963p.
Logan, W.M. 1866. Report of progress 1863-1866; Geological Survey of Canada, p.93.
20
Lowdon, J.A. 1960. Age determinations by the Geological Survey of Canada, Report 1: Isotopic Ages; Geological
Survey of Canada Paper 60-17, 51p.
Lowdon, J.A. 1961. Age determinations by the Geological Survey of Canada, Report 2: Isotopic Ages; Geological
Survey of Canada Paper 61-17, 127p.
Lumbers, S.B. and Vertolli, V.M. 2000a. Precambrian geology, Elmvale area; Ontario Geological Survey,
Preliminary Map P.3408, scale 1:50 000.
Lumbers, S.B. and Vertolli, V.M. 2000b. Precambrian geology, Gravenhurst area; Ontario Geological Survey,
Preliminary Map P.3409, scale 1:50 000.
Lumbers, S.B. and Vertolli, V.M. 2000c. Precambrian geology, Penetanguishene area; Ontario Geological Survey,
Preliminary Map P.3410, scale 1:50 000.
Lumbers, S.B. and Vertolli, V.M. 2000d. Precambrian geology, Bracebridge area; Ontario Geological Survey,
Preliminary Map P.3411, scale 1:50 000.
Lumbers, S.B. and Vertolli, V.M. 2000e. Precambrian geology, Lake Joseph area; Ontario Geological Survey,
Preliminary Map P.3412, scale 1:50 000.
Lumbers, S.B. and Vertolli, V.M. 2000f. Precambrian geology, Huntsville area; Ontario Geological Survey,
Preliminary Map P.3413, scale 1:50 000.
Lumbers, S.B. and Vertolli, V.M. 2000g. Precambrian geology, Orrville area; Ontario Geological Survey,
Preliminary Map P.3414, scale 1:50 000.
Marmont, C.M. 1988a. Feldspar in the Parry Sound–Huntsville–Haliburton area; Ontario Geological Survey, Open
File Report 5686, 133p.
Marmont, C.M. 1988b. Limestone (crystalline marble) in the Parry Sound–Huntsville area; Ontario Geological
Survey, Open File Report 5687, 71p.
Marmont, C.M. 1991. Building stone, feldspar, and limestone resources in Central Ontario; Ontario Geological
Survey, Open File Report 5719, 499p.
Murray, A. 1850. On the examination of the shores, islands and rivers of Lake Huron including parts of the east
coast of Hudson Bay and the Spanish River; in Geological Survey of Canada, Report of Progress 1848-49,
p.45-46.
NACSN. 1983. North American Stratigraphic Code, 1983; Association of Petroleum Geologists, Bulletin, v.67,
p.841-875.
40
39
Reynolds, P.H., Culshaw, N.G., Jamieson, R.A., Grant, S.L. and McKenzie, K. 1995. Ar/ Ar traverse - Grenville
Front Tectonic Zone to Britt Domain, Grenville Province, Ontario, Canada; Journal of Metamorphic Geology,
v.13, p.209-221.
Rivers, T., Martingole, J., Gower, C.F, and Davidson, A. 1989. New tectonic subdivisions of the Grenville Province,
southeast Canadian Shield; Tectonics, v.8, p.63-84.
Satterly, J. 1943. Mineral occurrences in Parry Sound District; Ontario Department of Mines, Annual Report, 1942,
v.51, pt.2, 86p.
21
Slagstad. T. 2003. Muskoka and Shawanga domains, Central Gneiss Belt, Grenville Province, Ontario: geochemical
and geochronological constraints on pre-Grenvillian and Grenvillian geological evolution; unpublished PhD
thesis, Dalhousie University, Halifax, Nova Scotia, 327p.
Stockwell, C.H. 1982. Proposals for time classification and correlation of Precambrian rocks and events in Canada
and adjacent areas of the Canadian Shield. Part 1: A time classification of Precambrian rocks and events;
Geological Survey of Canada, Paper 80-19, 135p.
Streckeisen, A. 1976. To each plutonic rock its proper name; Earth-Science Reviews, v.12, p.1-33.
Sutcliffe, R.H. 1991. Proterozoic geology of the Lake Superior area; in Geology of Ontario, Chapter 16, Ontario
Geological Survey, Special Volume 4, Part 1, p.627-658.
Tuccillo, M.E., Mezger, K., Essene, E.J. and van der Pluijm, B.A. 1992. Thermobarometry, geochronology and the
interpretation of P-T-t data in the Britt domain, Ontario Grenville orogen, Canada; Journal of Petrology, v.33,
p.1225-1259.
Turner, F.J. 1981. Metamorphic petrology, mineralogical, field and tectonic aspects; 2nd edition. McGraw-Hill, New
York, 524p.
van Berkel, J.T. and Schwertdner, W.M. 1986. Precambrian geology of the Moon River area, Muskoka and Parry
Sound Districts; Ontario Geological Survey, Preliminary Map P.2954, scale 1:50 000.
van Breemen, O. and Davidson, A. 1988. Northeast extension of Proterozoic terranes of mid-continental North
America; Geological Society of America Bulletin, v.100, p.630–638.
van Breemen, O. and Davidson, A. 1990. U-Pb zircon and baddeleyite ages from the Central Gneiss Belt, Ontario;
in Radiogenic Age and Isotopic Studies: Report 3, Geological Survey of Canada, Paper 89-2, p.85-92.
van Breemen, O., Davidson, A., Loveridge, W.D. and Sullivan, R.D. 1986. U-Pb zircon geochronology of
Grenvillian tectonites, granulites and igneous precursors, Parry Sound, Ontario; in The Grenville Province,
Geological Association of Canada, Special Paper 31, p.191-207.
Villard, D.J, Keevil, R., and Hogg, A. 1984. The gold potential of the Huntsville–Parry Sound area of Ontario;
Ontario Geological Survey, Open File Report 5521, 58p.
Walker, T.L. 1913. The Precambrian of Parry Island and vicinity; in Geological Survey of Canada, Guide Book
No. 5, p.98-100.
Wasserburg, G.J., and Hayden, R.J. 1955. A40-K40 dating; Geochimica et Cosmochimica Acta, v.7, p.51-60.
Wodicka, N., Parrish, R.R. and Jamieson, R.A. 1996. The Parry Sound domain: A far-traveled allochthon? New
evidence from U-Pb zircon geochronology; Canadian Journal of Earth Sciences, v.33, p.1087-1104.
Wodicka, N., Ketchum, J.W.F. and Jamieson , R.A. 2000. Grenvillian metamorphism of monocyclic rocks,
Georgian Bay, Ontario, Canada: implications for convergence history; The Canadian Mineralogist, v.38,
p.471-510.
Wynne-Edwards, H.R. 1972. The Grenville Province; in Variations in Tectonic Styles in Canada, Geological
Association of Canada Special Paper 11, p.263-334.
22
Appendix 1.
Listing of Published Geochronological Data for the Study Area.
23
Reference
Error, in Ma
Age, in Ma
Decay
System
Mineral
Appendix 1. Listing of published geochronological data for the study area.
Comment
31D13, Penetanguishene
z
U
1047
2 Bussy et al. 1995
z
U
1469
11 Ketchum and Krogh 1997
Go Home domain, pseudoeclogite, upper intercept, crystallization age
#4, Go home domain, age of regional metamorphism
z
U
1089
2 Ketchum and Krogh 1997
Go Home domain, pseudoeclogite, lower intercept, metamorphic age
31E4, Lake St. Joseph
984
976
985
995
940
976
761
839
860
Blackstone Lake, 207Pb/206Pb near concordant minimum
Blackstone Lake, 07Pb/206Pb , minimum
Blackstone Lake
GSC 59-45
GSC 59-44
Conger Twp, 07Pb/206Pb near concordant minimum
Tor 1223A
Tor 1224A
PS86B-1B, plateau age
u
u
k
m
m
u
k
b
m
W
W
K
K
K
W
K
K
A
z
z
U
U
1300 +17/-25 Wodicka, Parrish and Jamieson 1996
1317
24 Wodicka, Parrish and Jamieson 1996
90N213, tonalite, Paleoproterozoic inheritance at ~1660 and ~2270Ma
90N202, tonalite, interior Parry Sound domain, same age as the McKellar
gneiss (1326 as recalculated from van Breemen et al. 1986)
z
z
U
U
1163
1151
3 Wodicka, Parrish and Jamieson 1996
1 Wodicka, Parrish and Jamieson 1996
90N210, crystallization age, Parry Island anorthosite
89N153c, dike cutting Parry Island anorthosite, minimum age of
crystallization and time of metamorphism
z
U <1121
z
z
w
z
z
U
U
R
U
U
1350
1346
1330
1159
1377
4 Wodicka, Parrish and Jamieson 1996
41H7 and 41H8, Parry Sound
50 van Breemen et al. 1986
+69/-39 van Breemen et al. 1986
44 Connare & McNutt 1985
+5/-4 van Breemen et al. 1986
14 Wodicka, Parrish and Jamieson 1996
z
z
U
U
1160
1382
Circa Wodicka, Parrish and Jamieson 1996
30 Wodicka, Parrish and Jamieson 1996
w
z
R
U
1145
1042
Krogh and Davis 1969
4 Ketchum et al. 1998
#13, n=2
91-270, pre-kinematic dike cutting Pointe-au-Baril complex, in
Shawanaga shear zone
z
U
1019
4 Ketchum et al. 1998
z
U
988
2 Ketchum et al. 1998
t
t
t
t
t
m
b
m
m
m
U
U
U
U
U
A
A
A
A
A
1045
1026
967
956
1058
897
926
894
889
903
Ketchum et al. 1998
Ketchum et al. 1998
Ketchum et al. 1998
Ketchum et al. 1998
Tuccillo et al. 1992
Cosca 1989
Cosca 1989
Cosca 1989
Cosca 1989
Cosca 1989
91-267a, late syn-kinematic dike cutting Pointe-au-Baril complex, in
Shawanaga shear zone
91-269, post-kinematic dike cutting Pointe-au-Baril complex, in
Shawanaga shear zone
LH89-11-2, 07Pb/206Pb age
LH89-11-1, 07Pb/206Pb age
DS-1-2, 07Pb/206Pb age
DS-1-1, 07Pb/206Pb age
91-16
PSA-1, plateau
PSA-2, plateau
PS86B-9, plateau
PS86B-14B, plateau
PS86B-16C, plateau
40
60
60
70
80
3
2
4
4
3
3
3
Stockwell 1982
Wasserburg & Hayden 1955
Wasserburg and Hayden 1955
Lowdon 1960
Lowdon 1960
Cumming et al. 1955
Cumming et al. 1955
Cumming et al. 1955
Cosca 1989
41H1, Sans Souci
90N205c, 12 Mile Bay quartzite, youngest single grain
Whitestone anorthosite near Mill Lake, Geology of Ontario #321
Nobel gneiss (marginal orthogneiss), Geology of Ontario #323
Nobel gneiss, n=?, Isr=0.7033/17, MSWD=1.67
1159+5/-4, syntectonic pegmatite, Parry Sound shear zone
Isabella Island granite gneiss, cuts Whitestone anorthosite, upper limit for
igneous crystallization
89N104, Isabella Island granite gneiss, time of regional metamorphism
88N36c, megacrystic granite, best estimate of emplacement age,
mimimum age of 1361+/-9 Ma, metamorphism at 1160 Ma
24
Reference
Error, in Ma
Age, in Ma
Decay
System
Mineral
Appendix 1. Listing of published geochronological data for the study area - continued.
3
2
5
5
3
8
6
10
8
12
Comment
41H7 and 41H8, Parry Sound
Cosca 1989
Cosca 1989
Culshaw, Reynolds and Check 1991
Culshaw, Reynolds and Check 1991
Culshaw, Reynolds and Check 1991
Reynolds et al. 1995
Reynolds et al. 1995
Reynolds et al. 1995
Reynolds et al. 1995
Ketchum and Krogh 1997
m
b
h
b
m
m
m
m
m
z
A
A
A
A
A
A
A
A
A
U
909
1126
969
943
905
888
899
884
891
1121
z
U
1001
z
z
z
z
U
U
U
U
1095
1091
1114
<1385
w
z
t
R
U
U
1752
1457
1430
t
t
U
U
998
1049
15 Ketchum et al. 1998
Ketchum et al. 1998
t
t
t
t
t
t
t
t
t
t
t
t
t
z
U
U
U
U
U
U
U
U
U
U
U
U
U
U
985
961
1028
1024
1005
1004
1000
1000
958
1022
1018
1008
966
1452
Ketchum et al. 1998
Ketchum et al. 1998
Ketchum et al. 1998
Ketchum et al. 1998
Ketchum et al. 1998
Ketchum et al. 1998
Ketchum et al. 1998
Ketchum et al. 1998
Ketchum et al. 1998
Ketchum et al. 1998
Ketchum et al. 1998
Ketchum et al. 1998
Ketchum et al. 1998
2 Ketchum et al. 1994
z
U
1448
1 Ketchum et al. 1994
t
g
g
m
m
a
a
h
U
U
U
U
U
U
U
A
1078
1123
1396
1053
1062
1435
1450
974
4
3
6
2
2
2
1
5
PSI-861, plateau
PSI-861, total gas, excess argon, in Parry Sound shear zone
#6
#6
#7
#10
#11
#12
#13
Frederic Inlet pseudoecologite, Twin Doves Island, upper intercept,
metamorphic age
Frederic Inlet pseudoecologite, Twin Doves Island, lower intercept,
metamorphic age
Frederic Inlet pseudoecologite, Hooper Island, metamorphic age
Frederic Inlet pseudoecologite, King Bay, metamorphic age
#1, dike cuts early metamorphic fabric in Parry Sound domain
88N39b, Parry Sound assemblage quartzite, youngest grain, maximum
age of deposition
4 Ketchum and Krogh 1997
Ketchum and Krogh 1997
11 Ketchum and Krogh 1997
2 Bussy et al. 1995
4 Wodicka, Parrish and Jamieson 1996
41H9 and 41H10, Naiscoot
95 Krogh & Davis 1969, 1970a, 1970b, 1971b Pointe-au-Baril, #11, n=10, Isr=0.7016
+8/-6 van Breemen et al. 1986
Britt pluton emplacement, Geology of Ontario #320
17 Ketchum et al. 1998
GC89-117, tonalite phase of Pointe-au-Baril complex, upper intercept
GC89-117, tonalite phase of Pointe-au-Baril complex, lower intercept
TK84-92-1, 07Pb/206Pb, also 985 & 961 Ma fractions, older metamorphism
TK84-92-1, 07Pb/206Pb age
TK84-92-1, 07Pb/206Pb age
GC89-128-1, 07Pb/206Pb age
GC89-119-2, 07Pb/206Pb age
GC89-119-1, 07Pb/206Pb age
GC89-118-1, 07Pb/206Pb age
GC89-118-1, 07Pb/206Pb age
GC89-122-1, 07Pb/206Pb age
GC89-123-1, 07Pb/206Pb age
GC89-124-1, 07Pb/206Pb age
DS-3-1, 07Pb/206Pb age
DS-4-1, 07Pb/206Pb age
GC89-127-1, 07Pb/206Pb age
89-37a, mafic granulite, dates granulite facies metamorphism in Britt
domain
91-266, leucosome in mafic granulite, dates granulite facies
metamorphism in Britt domain at 1448 to 1452 Ma
Tuccillo et al. 1992
Tuccillo et al. 1992
Tuccillo et al. 1992
Tuccillo et al. 1992
Tuccillo et al. 1992
Tuccillo et al. 1992
Tuccillo et al. 1992
Culshaw, Reynolds and Check 1991
91-18, in Parry Sound shear zone
PS88-1, garnet, in Parry Sound shear zone
SH88-7b, garnet, Britt domain
SH88-7b/1, Britt domain
SH88-7b/2, Britt domain
SH88-58/1a, allanite, Britt domain
SH88-58/2a, allanite, Britt domain
#4, Britt pluton
25
964
948
904
904
899
896
1152
1050
Error, in Ma
Age, in Ma
Decay
System
Mineral
Appendix 1. Listing of published geochronological data for the study area - continued.
5
5
3
6
6
6
2
Reference
Comment
41H9 and 41H10, Naiscoot
Culshaw, Reynolds and Check 1991
Culshaw, Reynolds and Check 1991
Culshaw, Reynolds and Check 1991
Reynolds et al. 1995
Reynolds et al. 1995
Reynolds et al. 1995
Heaman and LeCheminant 1993
Heaman and LeCheminant 1993
#5, Shawanaga pluton
#5, Shawanaga pluton
#5, Shawanaga pluton
#50
#60
#70
coronitic metagabbro, see also van Breemen and Davidson 1990
coronitic metagabbro, see also van Breemen and Davidson 1990
h
b
m
m
m
m
d
z
A
A
A
A
A
A
U
U
z
U
* 1460 +12/-8 Krogh (unpubublished) cited in Ketchum
et al. 1998
Pointe-au-Baril complex granite, no location specified
z
U
* 1457 +10/-11 Ketchum et al. 1998
inherited zircon in pegmatite (GC91-267a,GC91-269,GC91-270) cutting
Pointe-au-Baril complex, upper intercept, no single location
z
U * ~1063
z
U
u
u
d
W
W
U
z
z
z
z
z
t
n
z
t
t
t
U
U
U
U
U
U
U
U
U
U
U
1013
2 Davidson & van Breemen 2001
1684
8 Corrigan, Culshaw and Mortensen 1994
1146 +137/-128 Corrigan, Culshaw and Mortensen 1994
1442 +7/-6 Corrigan, Culshaw and Mortensen 1994
945 +47/-48 Corrigan, Culshaw and Mortensen 1994
972
7 Corrigan, Culshaw and Mortensen 1994
1035
1 Corrigan, Culshaw and Mortensen 1994
1456
12 Corrigan, Culshaw and Mortensen 1994
1015
16 Corrigan, Culshaw and Mortensen 1994
990
2 Corrigan, Culshaw and Mortensen 1994
~980
Corrigan, Culshaw and Mortensen 1994
87DM34, zircon fraction, 07Pb/206Pb age
#1, upper intercept, Key Harbour granite
#1, lower intercept, Key Harbour granite
#2, upper intercept, Mann Island granodiorite
#2, lower intercept, Mann Island granodiorite
#2, Mann Island granodiorite, 07Pb/206Pb age
#3, peak M3 metamorphism, cooling through 725°C
#4, upper intercept, time of leucosome formation
#4, lower intercept, time of post-metamorphic cooling
#5, age of dike emplacement
#6, granodiorite similar to Mann Island granodiorite, similar titanite age
to Mann Island granodiorite
h
b
m
k
b
m
h
b
h
k
h
k
h
k
m
h
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
968
978
924
902
993
922
967
1004
1020
917
991
980
992
936
931
1005
#1, Britt pluton
#1, Britt pluton
#1, Britt pluton
#1, Britt pluton
#2, Britt pluton
#2, Britt pluton
#3, Britt pluton
#3, Britt pluton, excess argon?
#102, plateau, eastern Grenville Front tectonic zone
#102, plateau, eastern Grenville Front tectonic zone
#103, plateau, eastern Grenville Front tectonic zone
#103, plateau, eastern Grenville Front tectonic zone
#33, plateau, eastern Grenville Front tectonic zone
#33, plateau, eastern Grenville Front tectonic zone
#38, plateau
#118, plateau
Ketchum et al. 1998
Near concordant overgrowths on inherited zircons in pegmatite, dates
regional metamorphism, no single location
41H15, Key Harbour
1467 +11/-7 Davidson and van Breemen 1994
1043
875
>1454
Kings Island pluton, near Grenville Front tectonic zone--Britt domain
boundary, similar age to Britt pluton
Besner Mine, 207Pb/206Pb near concordant minimum
Besner Mine, 207Pb/206Pb near concordant maximum
87DM34, 3 discordant grains yield minimum age, 07Pb/206Pb ages of
1287, 1343 and 1454 Ma
Lowdon 1961
Cumming et al. 1955
Davidson and van Breemen 2001
5
6
3
6
5
3
7
6
5
8
5
8
8
8
7
8
Culshaw, Reynolds and Check 1991
Culshaw, Reynolds and Check 1991
Culshaw, Reynolds and Check 1991
Culshaw, Reynolds and Check 1991
Culshaw, Reynolds and Check 1991
Culshaw, Reynolds and Check 1991
Culshaw, Reynolds and Check 1991
Culshaw, Reynolds and Check 1991
Reynolds et al. 1995
Reynolds et al. 1995
Reynolds et al. 1995
Reynolds et al. 1995
Reynolds et al. 1995
Reynolds et al. 1995
Reynolds et al. 1995
Reynolds et al. 1995
26
k
h
m
k
h
m
m
m
k
b
A
A
A
A
A
A
A
A
K
K
929
998
934
922
990
932
903
904
835
779
Error, in Ma
Age, in Ma
Decay
System
Mineral
Appendix 1. Listing of published geochronological data for the study area - continued.
8
7
8
5
7
9
8
50
50
Reference
Comment
41H9 and 41H10, Naiscoot
Reynolds et al. 1995
Reynolds et al. 1995
Reynolds et al. 1995
Reynolds et al. 1995
Reynolds et al. 1995
Reynolds et al. 1995
Reynolds et al. 1995
Reynolds et al. 1995
Lowdon 1960, 1961
Lowdon 1960, 1961
#118
#49
#49
#49
#107
#108
#1a
#40
GSC 59-47
GSC 59-46
Mineral abbreviations: a = allanite, b = biotite, d = baddeleyite, g = garnet, h = hornblende, k = potassium feldspar, m = muscovite,
n = monazite, t = titanite, u = uranitinite, w = whole rock, z = zircon. Decay system abbreviations: A = 40Ar/39Ar , K = K/Ar, R = Rb/Sr,
U = U/Pb, W = Pb/Pb.
All ages are plotted on maps P.3548 through P.3552, except for ages with an * appearing before the age. In these cases, no specific location was
available, or the ages reported are composites from several sample sites.
27
Metric Conversion Table
Conversion from SI to Imperial
Conversion from Imperial to SI
SI Unit
Multiplied by
Gives
Imperial Unit
1 mm
1 cm
1m
1m
1 km
0.039 37
0.393 70
3.280 84
0.049 709
0.621 371
LENGTH
inches
1 inch
25.4
inches
1 inch
2.54
feet
1 foot
0.304 8
chains
1 chain
20.116 8
miles (statute) 1 mile (statute) 1.609 344
mm
cm
m
m
km
1 cm@
1 m@
1 km@
1 ha
0.155 0
10.763 9
0.386 10
2.471 054
AREA
square inches 1 square inch
square feet
1 square foot
square miles
1 square mile
acres
1 acre
6.451 6
0.092 903 04
2.589 988
0.404 685 6
cm@
m@
km@
ha
1 cm#
1 m#
1 m#
0.061 023
35.314 7
1.307 951
VOLUME
cubic inches
1 cubic inch
cubic feet
1 cubic foot
cubic yards
1 cubic yard
16.387 064
0.028 316 85
0.764 554 86
cm#
m#
m#
CAPACITY
1 pint
1 quart
1 gallon
Multiplied by
1L
1L
1L
1.759 755
0.879 877
0.219 969
pints
quarts
gallons
1g
1g
1 kg
1 kg
1t
1 kg
1t
0.035 273 962
0.032 150 747
2.204 622 6
0.001 102 3
1.102 311 3
0.000 984 21
0.984 206 5
MASS
ounces (avdp) 1 ounce (avdp) 28.349 523
ounces (troy) 1 ounce (troy) 31.103 476 8
pounds (avdp) 1 pound (avdp) 0.453 592 37
tons (short)
1 ton (short)
907.184 74
tons (short)
1 ton (short)
0.907 184 74
tons (long)
1 ton (long)
1016.046 908 8
tons (long)
1 ton (long)
1.016 046 90
1 g/t
0.029 166 6
1 g/t
0.583 333 33
CONCENTRATION
ounce (troy)/
1 ounce (troy)/
ton (short)
ton (short)
pennyweights/ 1 pennyweight/
ton (short)
ton (short)
Gives
0.568 261
1.136 522
4.546 090
L
L
L
g
g
kg
kg
t
kg
t
34.285 714 2
g/t
1.714 285 7
g/t
OTHER USEFUL CONVERSION FACTORS
1 ounce (troy) per ton (short)
1 gram per ton (short)
1 ounce (troy) per ton (short)
1 pennyweight per ton (short)
Multiplied by
31.103 477
grams per ton (short)
0.032 151 ounces (troy) per ton (short)
20.0
pennyweights per ton (short)
0.05
ounces (troy) per ton (short)
Note: Conversion factors which are in bold type are exact. The conversion factors have been taken from or have been
derived from factors given in the Metric Practice Guide for the Canadian Mining and Metallurgical Industries, published by the Mining Association of Canada in co-operation with the Coal Association of Canada.
28
ISSN 0826--9580
ISBN 0--7794--6720--5
LEGEND
79°39´55
45´
50´
55´
80°00´00
81
580000m
79
84
83
82
60
29a
18b
4983000m
Big
Splitrock
50b
35
Island
Island
33
Rabbit
45
35
37
45
85
Home
70
Bay
Long Island
48b
51a
50b
82
QUATERNARY
4983000m
Sahanatien
15b
Lake St. Patrick
er
iv
R
65
50b
Landing
GIBSON I.R. 31
18a
57
and till
33
2
4980000m
ua
30
32
a
qu
us
M
50b
84
18b
30
r
65
50b
60
82
51a
48b
30
12
20
Island
29b
28
Island
20
5
29b
70
68
Cognashene
10
28
34
Maxwell
75
Island
Island
25
Island
13
35
66
35
18b
50b
50
20
35
35
20
29a
80
55´
Whalesback
30
74
Islands
48b
40
65
29b
Tomb
Island
Island
29b
16
23
PARK
20
25
Minnicog-
29a
40
30
8
70
Island
51
72
60
18b
35
80
20
50
4
20
18b
53
75
25
3
30
15b
5
32
34
40
15
CONGER TP
20
71
80
50
Point
48
5
Roberts Island
4970000m
Ti
52
il Isla
nd
Kettle's Bay
Sawlog Bay
Clearwater Beach
Kettle's
Beach
18b
Gignac Lake
76
70
54b
23
45
6
85
48a
18b
6
66
86
67
57
25 40
20
25
20
15b
18b
18b
10
17
14
22
Kettle's
P
's
tt e
56
14
Cr
Marygrove
23
10
INTRUSIVE CONTACT
25
26
25
10
10
25
20
6
18b
r
u
Black Bay
Lake
10
80
St gr
25
C r eek
Beach
56
Lake
42
Port Severn
45
Amphibolite
44c
Interlayered amphibolite, semi-pelitic gneiss and
17b
41
47a
43
25
40
4960000m
Green
60
47a
4
TAY TP
W
a
39
Midland Point
u
sh
e
Portage
Park
Sunnyside
e
C
56
ha
nn
15b
Marble; may be associated with rusty graphitic schist
15c
Calc-silicate gneiss
Migmatitic Rocks
Pink, sugary, layered leucocratic gneiss
of granodioritic to monzodioritic composition
43b
Grey biotite leucogneiss of granodioritic composition
Migmatitic Rocks
Mafic Rocks
Grey, leucocratic, migmatitic hornblende-biotite-garnet
Amphibolite
orthogneiss of tonalitic to granodioritic composition
12
Metasedimentary Rocks
Unclassified paragneiss
11
Metasedimentary Rocks
Pink, layered, leucocratic paragneiss
Felsic Rocks
10
Metasedimentary Rocks
Rusty weathering, graphitic paragneiss
Intermediate to Felsic Granulites
Unsubdivided, grey to buff weathering, orthopyroxene-
9
Metasedimentary Rocks
bearing intermediate (granodiorite, tonalite to diorite)
Grey, migmatitic, leucocratic garnet-biotite paragneiss,
orthogneiss
locally with sillimanite; pink leucosome, may contain garnet,
Intermediate to Felsic Granulites (layered)
Bayfield Gneiss Association (units 6 to 8)
Intermediate to Felsic Rocks
Pink, sugary leucocratic gneiss
Intermediate to Felsic Granulites (retrogressed)
Unsubdivided, grey, foliated to gneissic, intermediate
7
Intermediate to Felsic Intrusive Rocks
7a
evidence of retrogression from a granulite facies precursor
58
potassium feldspar megacrysts
37
Sunset Beach
7b
Mafic Rocks
granulite or gneissic metagabbro
H o g Ba y
TAY TP
6
TAY TP
36
ls
Stur geon Bay
4957000m
Crystal Beach
Metasedimentary Rocks
36a
Layered paragneiss, garnet-rich granulite
36b
Marble, calc-silicate tectonic breccia
Metasedimentary Rocks
6a
17b
56
rusty weathering
ls
PROVINCIAL PARK
44°45´00
93
580000m
80°00´00
56
81
82
83
84
86
85
55´
87
88
89
590000m
91
93
92
50´
94
95
96
97
98
99
45´
600000m
01
02
03
604000m
Calc-silicate and amphibolite gneiss associated with
garnet-biotite paragneiss of unit 6a
Matchedash
Bay
WAUBASHENE BEACHES
Ogden's Beach
Grey, leuco- to mesocratic garnet-biotite paragneiss,
commonly with sillimanite; locally graphitic and
6b
44°45´00
Grey, leucocratic, migmatitic hornblende-biotite-garnet
orthogneiss of tonalitic to granodioritic composition
Unsubdivided, layered, predominantly mafic two-pyroxene
17b
4956000m
Unsubdivided grey and pink, variably layered, highly
strained orthogneiss, in places with recrystallized
(e.g., unit 39 or 40); pegmatite veins may be common
Triple Bay Park
57
Synform, interpreted;
unknown generation,
trend only, limbs dip
Lineation (with plunge,
in opposite directions
subhorizontal)
35
Mineral occurrences,
Fold axis; minor fold,
prospects,
m-asymmetry
discretionary
(with plunge)
occurrences
(as classed by the
Geological contact
Mineral Deposit
(interpreted)
Inventory (MDI))
Limit of mapping;
Location of isotopic
denotes limits of area
mapped during this
survey
Fault, interpreted;
trend only
bA 978 ± 6
age determination
Dorset
117
Sans
Souci
Dyer's Bay
Baysville
MacTier
P.3551
(trend only, inclined)
35
Port Sydney
141
BAY
Tobermory
Dwight
60
Huntsville
Rosseau
6
Foliation
11
Orrville
Parry Sound
118
400
Bala
Lion's
118
Bracebridge
169
45°
Head
45°
Edenhurst
Honey
Harbour
Purple
Valley
LAKE
Penetanguishene
Gravenhurst
P.3552
Norland
Washago
12
Wiarton
HURON
81°
Shallow
Nottawasaga
Midland
Bay
Leith
26
Woodford
11
80°
Thornbury
Location Map
12
169
79°
Orillia
48
427m
Brechin
1 cm equals 25 km
SOURCES OF INFORMATION
Thematic information on this map is tied to a digital base map derived
from map 31 D/13 of the National Topographic System, scale 1:50 000.
American Datum 1983 (NAD83), Zone 17.
Geological Survey of Canada Ontario Department of Mines 1954.
Aeromagnetics, Penetanguishene; Geological Survey of Canada
Ontario Department of Mines, Geophysical Map 128G, scale 1:63 360.
ABBREVIATIONS
Ontario Geological Survey 2002.
(MDI2)
gf ............................................................graphite
ls ..........................................................limestone
St gn...............................................stone, gneiss
St gr...............................................stone, granite
Ti ............................................................titanium
zU = zircon U/Pb date, in Ma
Mineral Deposit Inventory Version 2
October 2002 Release; Ontario Geological Survey, Digital Data.
Bussy, F., Krogh, T.E., Klemens, W.P. and Schwerdtner, W.M. 1995.
Tectonic and metamorphic events in the westernmost Grenville Province,
central Ontario: new results from high-precision U-Pb zircon
geochronology; Canadian Journal of Earth Sciences, v.32, p.660-671.
Culshaw, N.G., Corrigan, D., Drage, J. and Wallace, P. 1988. Georgian
Bay geological synthesis: Key Harbour to Dillon, Grenville Province of
Ontario; in Current Research, Part C, Geological Survey of Canada,
Paper 88-1C, p.129-133.
Ketchum, J.W.F. and Krogh, T.E. 1997. U-Pb constraints on high-
Grenville orogen; Geological Association of Canada Mineralogical
Association of Canada, Programs with Abstracts, v.22, p.A-78.
1 foot = 0.3048 m.
05
79°39´55
CREDITS
N. Wodicka, 1987 to 1990.
Geological compilation by N.G. Culshaw, 1991 and 2004.
Digital drafting by S. Josey.
R.M. Easton.
Unclassified paragneiss
43a
(granodiorite, tonalite to diorite) orthogneiss containing
17b
el
Robin's Point
Island
Grandview Beach
in opposite directions
Broadbent
Nobel
P.3550
Mafic orthogneiss
Britt Domain (units 1 to 14)
8
38
Methodist
58
Midl and Bay
n
Mafic Rocks
granulite
59
Canary Island
a
Monzonitic to granitic orthogneiss
PARAUTOCHTHON NORTH OF PARRY SOUND DOMAIN
Unsubdivided, buff to grey weathering, layered, feldspathic
Forest
Harbour
u
b
17b
muscovite, magnetite
17b
17b
Paradise Point
trend only, limbs dip
vertical)
GEORGIAN
Novar
Cartographic production by S. MacLean.
received a technical edit.
Discrepancies may occur for which the
Ontario Ministry of Northern Development and Mines does not assume
18b
22
Penetang
69
Kearney
Sprucedale
McKellar
To enable the rapid dissemination of information, this map has not
Island
18b
59
Unclassified granitoid orthogneiss
Grey, migmatitic, leucocratic hornblende-biotite orthogneiss
Buff to pink weathering, leucocratic granulite
Island
20
TAY TP
17a
Intermediate to Felsic Rocks
Parry Sound Domain (interior) (units 36 to 41)
Potato
18b
Intermediate to Felsic Rocks
15a
PARRY SOUND DOMAIN (INTERIOR)
25
35
Pink to grey, migmatitic leucogranite to granodiorite
Quartzite
18b
St. Andrews
Penetanguishene
Mafic orthogneiss
44b
TECTONIC CONTACT WITH SUBJACENT
61
60
Point
44a
Channel
32
Pink to grey leucocratic gneiss
18b
BASE OF LOWER GO HOME DOMAIN NOT OBSERVED
Mafic and Metasedimentary Rocks
Tug
Lake
Pointe au
Geology, legend and mineral deposit information reviewed by
13
St gr
15
18a
Metasedimentary Rocks
15
Intermediate to Felsic Rocks
62
26
6
Pen
e
Cranberry
St gr
36
30
tan
g Ha
rbour
43
15
25
26
27
10
Dunchurch
Geology by N.G. Culshaw, D. Corrigan, J.W.F. Ketchum, P. Wallace and
14
30
61
(trend only, inclined,
35
Ardbeg
Baril Station
Felsic Rocks
18
Blackstone Lake Gneiss Association (units 42 and 43)
45
42
18b
17b
Reynolds
Grey, migmatitic layered gneiss
15
45
47a
unknown generation,
Magnetawan
Burk's Falls
P.3549
Metric conversion factor:
Nadeau Island Gneiss Association (units 9 to 14)
25
35
18b
Su
ck
er
Petaguishene
Antiform, interpreted;
unknown generation
35
Ahmic
Harbour
Inlet
Honey Harbour Gneiss Association (units 15 to 18)
63
Little Lake
15
zU 1469 ± 11
62
Pink, sugary, layered leucocratic gneiss
46b
quartzite
55
60
32
Lake
46a
35
20
Point
foliation;
South River
Sundridge
Magnetawan
Geology not tied to surveyed lines.
Felsic to Intermediate, Layered or Migmatitic Rocks
44d
Moore
zU 1089 ± 2
Point
44
Point
53
Basin
Highland
64
30
60
Peekaboo Point
Port Loring
North
Magnetic declination approximately 10°49'W in 2004.
Grey, migmatitic tonalite to granodiorite orthogneiss
35
53
Farlain
4960000m
e
18
35
Northwest
Toanche
47a
80
Present Island
53
Farlain
L
ak
10
St gr
a
rb
o
r
46
65
's
Leduc
65
H
Pakesley
PARAUTOCHTHON SOUTH OF PARRY SOUND DOMAIN
18b
17a
te
u
50´
33
64
Key
Commanda
ALLOCHTHON-PARAUTOCHTHON BOUNDARY
Moon River Gneiss Association (units 44 to 46)
45
32
46°
Restoule
Pickerel
pressure metamorphism in the Central Gneiss Belt, southwestern
24
Point
O
ro
n
14
Beausoleil
18b
6
Grey hornblende-epidote-biotite tonalitic orthogneiss
(NADEAU ISLAND GNEISS ASSOCIATION):
Moon River Subdomain (units 42 to 46)
13
Grey, migmatitic, tonalitic to granodioritic gneiss with
TECTONIC CONTACT WITH SUBJACENT BRITT DOMAIN
16
14
10
Fossmill
varied amounts of pink leucosome
17
8
14
20
Coutnac Beach
20
Grey metatextite with pink, hornblende-epidote-bearing
ALLOCHTHON
66
73
Maceys Bay
23
25
Kiosk
79°
Powassan
LATE PALEOPROTEROZOIC
69
r
a
65
50´
TINY TP
400
17
B
56
Migmatitic Rocks
19b
17
12
Intermediate to Felsic Rocks
leucosome
EARLY MESOPROTEROZOIC to
19
10
23
ee k
PROVINCIAL PARK
63
67
46
30
18
Quartzite
19a
50
12
10
10
22
21e
Small outcrops of unit 47a or 47b hosted by adjacent
80
37
5
80
80°
Noëlville
Lower Go Home Domain (units 15 to 18)
65
3
10
o
ic
AWENDA
36
19
Weakly foliated to gneissic, mafic intrusive complex
15
45
Para-amphibolite
tectonostratigraphic boundaries) (indicated by triangles)
85
33
17a
Anorthosite, gabbroic anorthosite, minor gabbro
country rock units (commonly found along
20
Lake
66
47b
47a
50
24
47a
Deer
63
36
7
18b
Small outcrops of unit 48a or 48b hosted by adjacent
Island
85
18b
25
26
85
47
48c
19
42
55
26
45
33
47a
13
10
26
20
consisting of gabbro, anorthosite and ultramafic rocks
64
80
Hornblende diorite, gabbro
47c
50
26
Weakly foliated to gneissic metagabbro, primary
48b
Bay
80
20
Beach
30
20
10
30
Wolverine
14
14
34
46
Home
69
75
17a
24
21d
19c
68
25
56
45
32
8
Calc-silicate gneiss
Mafic Intrusive Rocks, Anorthosite Suite
47
80
5
21
Pink to grey marble
21c
Ojibway Gneiss Association (units 19 and 20)
Go
67
66
17b
51
61
18b
43
85
65
Unit 50a, with associated pink granite and grey
21b
country rock units (indicated by dots)
22
18b
18b
horizons
igneous texture commonly preserved
Little
60
60
4
15b
31
paragneiss and schist ("Dillon schist") with quartzite
Intermediate Intrusive Rocks
69
43
BAXTER TP
Park
30
11
Alban
Waubamik
Dillon
Mafic Intrusive Rocks
48
50
42
10
Bayview
30
MATCHEDASH TP
38
18
Medium to dark grey, biotite-rich quartz-plagioclase
Unsubdivided pink and grey leucocratic gneiss
14
3
12
5
55
15b
Beau sole
Sawlog Bay
68
60
19
15a
70
18b
Metasedimentary Rocks
Weakly foliated to gneissic, grey hornblende-biotite
granodiorite and monzodiorite
41
15b
21
Weakly foliated to gneissic, grey tonalite with associated
62
18b
49
35
8
84
50b
20
70
26
Agreement (ERDA) signed by the governments of Canada and Ontario.
Universal Transverse Mercator (UTM) co-ordinates are in North
Unit 51a, with associated granite and monzonite
minor tonalite
65
20
Harbour
15b
Bay
18
Dark grey dioritic orthogneiss, possible hypabyssal
intrusion (circa 1450 Ma)
granodiorite, locally potassium feldspar megacrystic,
64
South
36
30
22b
Grey tonalitic orthogneiss
57
65
40
Intermediate Rocks
Weakly foliated to gneissic, pink monzonite, minor
granodiorite
64
36
15
50a
31
47a
15
47
2
22
Intermediate to Felsic Intrusive Rocks
Chute
54
60
10
18b
Honey
50
Tonch
65
72
18b
12
24
45
30
Island
80
50
71
8
South Bay
Harbour
PARK
51
60
16
Unit 52a, strongly foliated to protomylonitic
PROVINCIAL
28
33
15b
30
75
Honey
Royal
69
71
Island
65
52
20
78
Unit 52a, with associated granite and quartz monzonite,
21a
Big
23
73
51b
44
18b
35
75
25
70
5
grey, migmatitic leucogneiss
syenite
SIX MILE LAKE
25
25
10
Island
45
37
45
40
Felsic Rocks
Pink, migmatitic, sugary leucocratic gneiss and subordinate
Felsic to Intermediate Intrusive Rocks
51a
gf
28
15b
20
Mermaid
40
20
56
45
7
51
30
7
18b
56
Beausoleil
43
18b
9
Little
Bay
Bay
25
65
42
23
22a
30
35
60
Bay
16
Beausoleil
Turtle
20
Pink, leucocratic granite, locally potassium feldspar
72
18b
15
15b
30
20
20
4
Grey, layered quartzofeldspathic gneiss containing
commonly potassium feldspar megacrystic
15
35
35
10
21
46
14
16
North
20
74
4970000m
52b
30
9
Deer Island
40
18b
23
24
Intermediate to Felsic Rocks
Felsic Intrusive Rocks
65
30
45
45
52
52c
50
51a
29a
45
Georgian Bay
73
5
25
15b
45
55
85
28
30
71
20
Lake
37
48
33
13
Fairy
10
29a
55
6
34
Island
Sand Bay Gneiss Association (units 21 to 24)
20
60
only
parallel tectonic
ALLOCHTHON-PARAUTOCHTHON BOUNDARY
megacrystic
Landing
30
subsidiary agreement to the Economic and Regional Development
P.3548 Britt
interpreted; trend
layering and/or
TECTONIC CONTACT WITH SUBJACENT LOWER GO HOME DOMAIN:
Shawanaga Domain (units 19 to 24)
Ontario 1985 Mineral
Development Agreement (COMDA), a
Red Bay
15b
14
the five-year Canada
Harbour
Lineament,
Compositional
35
Intermediate to Felsic Rocks
hornblende, biotite, epidote
Wood
35
24
29b
20
74
30
85
23
Fraser Bank
35
51a
60
69
20
20
INTRUSIVE CONTACT
52a
80
55
30
30
15b
53
30
28
Smooth
6
33
7
ha
80
50
40
C
SYMBOLS
Grey, migmatitic tonalitic and granodioritic orthogneiss
COMMONLY CONTAINING GARNET
66
Bay Geological Synthesis, funded as part of
Trout Creek
Felsic Rocks
"SINGLE CYCLE PLUTONIC ROCKS", VARIABLY
70
48b
28
st
o
Buck
50b
Island
nashene
20
Bearshead Lake
mapping program, Project C.2.3, Georgian
French River
Pink, sugary leucocratic granite gneiss
Lake
6
Thibodeau
L
DEFORMED AND MIGMATITIC ORTHOGNEISS,
51a
26
coarse-grained, locally ophitic textured, metagabbro
el
nn
10
50
Mapping was conducted as part of a three-year
69
Mafic Rocks
Pere Brebeuf Gneiss Association (units 25 and 26)
Mafic Intrusive Rocks, Coronitic Metagabbro Suite
Dark green to black, weakly foliated to gneissic, medium- to
70
40
Grey, migmatitic tonalitic and granodioritic orthogneiss
Layered to podiform calc-silicate gneiss
70
12
Island
18b
55
18b
15b
80
30
Starr's
55´
18b
50
50
20
65
Island
12
27
PROVINCIAL
10
Thompson's
29a
Governor
20
AWENDA
73
48b
correspond to a suite or a complex.
Geological Survey.
Killarney
Unit 54a, with associated anorthosite and gabbro pods
(circa 1165 Ma)
45
30
30
53
60
70
60
29a
Metasedimentary Rocks
27
25
50
45
70
72
Giants
55
65
40
30
51a
Island
If it were decided to
Mafic orthogneiss, amphibolite
Weakly foliated to gneissic mafic rocks of unknown
75
Cedar Nook
30
28
and slivers
10
50
50b
54b
Crooked
25
72
metamorphism or intrusion of mafic dikes.
1983 North American Stratigraphic Code, in most cases, they would
29b
Mafic Rocks
facies metamorphism and variably retrogressed
Bay
Bay
20
48b
35
65
35
Webber
Culshaw et al. (1988), that is primarily based on rock type, but which
formally name a "gneiss association" as a lithodemic unit under the
protolith and of varied age, subjected to eclogite
73
12
gneiss association is an informal stratigraphic term, introduced by
This map is published with the permission of the Director, Ontario
Byng
54
11
15
WITHIN THE GRENVILLE PROVINCE
76
24
Thus, not all
map units in the legend may appear on the map face.
Intermediate to Felsic Rocks
Grey, heterogeneous, leucosome-rich (>25%),
2 km
NTS References: 31 D/13
46°
75
60
80
MESOPROTEROZOIC
54a
44
16
Maps P.3548, P.3549, P.3550, P.3551 and P.3552.
also may contain information with respect to plutonic history,
29
1
©
81°
54
33
30
10
54
This is a legend common to Ontario Geological Survey Preliminary
77
PARK
50
Lake
28
26
Ship
40
34
3
24
This legend is a field legend that locally incorporates the results of
A
0
Queen's Printer for Ontario, 2004.
laboratory investigations, including petrography and geochemistry.
c
INTRUSIVE CONTACT
57
35
Straight and mylonitic gneiss derived from units 1a
and/or 1b
a
No
Unit 1a, with minor amounts of unsubdivided polycyclic
migmatitic granodioritic gneiss
PROVINCIAL
37
30
66
12
34
35
Big
23
80
40
16
70
25
Island
Burnt
20
33
15
20
Wabeck
1c
LOCATED WITHIN THE PARRY SOUND SHEAR ZONE
Brown weathering, fine- to medium-grained diabase
McCrae
60
61
60
1b
b
HIGH-GRADE METAMORPHISM
40
51a
70
(590 Ma)
Lone Lake
48b
80
29
25
Island
Metasedimentary Rocks
Mafic Intrusive Rocks (Grenville diabase dike swarm)
GIBSON RIVER
50
50b
14
19
40
Aberdeen
47
30
16
Island
70
leucosome older than the dikes is observed
Crooked
18b
51a
30
35
70
28
15b
60
15b
75
25
15a
22
Arthur
15c
Eshpabekong
76
33
25
35
45
50b
35
40
75
Island
25
20
50
20
21
25
30
r
ek
5
29a
45
51a
35
metamorphosed mafic dikes (amphibolite).
Pine Island Gneiss Association (units 27 to 29)
69
re
C
10
Portage
Bone
12
78
18b
ry
12
48b
40
30
1000 m
Mostly medium-grained, moderately foliated to gneissic,
pelitic and garnet-rich gneiss interlayered with
NEOPROTEROZOIC
55
6
50a
20
84
Gibson Riv
e
1
15
Franceville
47
Island
38
15b
35
1a
migmatitic, granodiorite to tonalite containing
Upper Go Home Domain (units 25 to 29)
ng
Hu
Stocking's
45
1
PENETANGUISHENE AREA
Scale 1:50 000
Para-amphibolite and unsubdivided paragneiss; includes
Gneiss Association (unit 30)
Gibson Lake
70
32
5
Intermediate Migmatitic Rocks
Mafic and Metasedimentary Rocks
grey to white sublithographic to lithographic limestone)
PRECAMBRIAN
GIBSON TP
50
25
8
35
Mafic Rocks
UNCONFORMITY
26
45
70
37
45
77
33
Cognashene
40
Quartzite, minor associated paragneiss
Grey biotite-muscovite-garnet-kyanite gneiss and schist
26
65
70
Lake
18b
85
85
87
5
49
sillimanite gneiss; minor quartzite, calc-silicate gneiss
TECTONIC CONTACT (SUSPECT) WITH THE SHAWANAGA DOMAIN,
70
22
locally with garnet-hornblende and garnet-kyanite and
granodiorite orthogneiss
Gneissic Rocks Structurally Below the Lighthouse
50
45
Layered, pink to grey quartz-feldspar-biotite paragneiss,
Layered, migmatitic, grey tonalite, minor trondhjemite,
grey to blue-grey interbedded limestone and dolostone,
arkosic sandstone, pebbly sandstone, siltstone and shale)
26
Ontario Geological Survey
PRECAMBRIAN GEOLOGY
and metasedimentary gneiss
79
50a
50b
38
Intermediate to Felsic Rocks with Metadiabase Dikes
quartzofeldspathic gneiss and minor quartzite
Chemical Sedimentary Rocks
Lake
51a
20
Mafic monzodiorite gneiss
and Shadow Lake Formation (calcareous red and green
Lalonde
46
78
66
St gn
80
Mafic gneiss; minor metagabbro, anorthositic gneiss
3b
Unsubdivided: includes Gull River Formation (light brown-
48b
55
15
25
56
Lake
60
75
4980000m
15b
77
48b
48b
51a
Bear
75
45
35
65
10
30
85
31
MIDDLE ORDOVICIAN
Lake
35
3a
Metasedimentary Rocks
2
ORDOVICIAN
80
80
32
29b
ve
50
40
32
60
Ri
48b
50b
29a
79
sh
20
80
30
Mafic Rocks
3
Amphibolite
Boot
M
50a
60
10
84
80
iv er
s on R
Gib
51a
us
q
87
25
Mafic and Metasedimentary Rocks
Bustard Islands Gneiss Association (unit 1)
PALEOZOIC
81
sh
50a
60
Predominantly grey gneiss with pink granitic leucosome
33b
51a
50
75
4c
UNCONFORMITY
33
47
quartzite
33a
51a
47
Pink, sugary leucocratic gneiss
Glacial deposits; sand and gravel, clay
32
67
Unsubdivided pink and grey leucocratic gneiss
4b
Lighthouse Gneiss Association (units 31 to 33)
20
65
30
18b
29a
34
82
60
81
4a
Para-amphibolite, layered mafic gneiss, paragneiss and
PLEISTOCENE
70
83
Intermediate to Felsic Rocks
4
Mafic Rocks
:
MAP P.3552
Lake, stream and swamp deposits
Lake
Lake
Potters
20
63
51a
35
RECENT
Lake
48b
28
Armer Bay Gneiss Association (units 34 and 35)
Quartzite, minor associated paragneiss and para-amphibolite
25
60
Multicomponent layered gneiss and migmatite, minor
amphibolite
Lafarce
Gibson
50
62
Intermediate to Mafic Migmatitic Rocks
5
Parry Sound Domain (basal) (units 30 to 35)
Sahanatien
60
10
Key Harbour Gneiss Association (units 2 to 5)
LOCATED WITHIN PARRY SOUND SHEAR ZONE
CENOZOIC
zU 1047 ± 2
13
51a
PHANEROZOIC
Webster Lake
48b
4
50
22
10
46
Home
10
45°00´00
51a
15
20
THRUST CONTACT WITH PARRY SOUND DOMAIN (BASAL),
05
604000m
WOOD TP
25
35
03
02
01
600000m
99
98
97
Lake 15
Lake
8
42
Go
Go
62
15
51a
Lake
24
51a
25
Swan
Lake
Home
50a
64
Coldwater
Go
35
45°00´00
96
95
94
93
92
91
590000m
89
88
87
86
85
abc
liability.
Users should verify critical information.
Issued 2004.
Information from this publication may be quoted if credit is given.
It is
recommended that reference to this map be made in the following
form:
Culshaw, N.G., Corrigan, D., Ketchum, J.W.F., Wallace, P. and
Wodicka, N. 2004. Precambrian geology, Penetanguishene area;
Ontario Geological Survey, Preliminary Map P.3552, scale 1:50 000.
55´
560000m
59
58
57
64
63
62
61
45°15´00
31
23
25
31
PARRY ISLAND I.R. 16
Parry Island
47a
47a
Baker
Group
5010000m
50
65
60
75
72
34
57
55
40
14
20
86
47a
75
40
37
Group
37
50
Conlin
Island
Island
58
48
no
bu
au
W
37
48
37
70
70
40
zU 1151 ± 1
66
an
57
61
ne
l
37
80
37
72
70
55
61
Matthews
37
Ajax
41
53
69
Vanderdasson
Island
Island
70
44
64
39
70
87
48
30
63
76
66
85
60
37
71
30
73
38
37
70
75
37
72
72
99
72
40
65
37
65
57
58
39
85
37
55
Georgian Bay
36
29
40
96
Loon
50
31
35
38
40
32
95
20
5
8
28
75
51
45
40
39
26
21
44b
35
14
8
27
23
zU <1121 ± 4
29a
25
30
26
22
30
40
O'DONNELL POINT
21
10
30
POINT
23
44b
47
32
13
29b
30
10
32
40
24
18
23
44
29a
10
27
40
36
27
14
18b
20
65
26
35
35
30
32
51
25
14
18b
18b
60
51a
82
27
50b
88
36
Western Islands
5
10
11
45
40
9
50
45
34
Island
30
38
70
51a
30
50
25
38
16
29a
10
20
15a
15a
16
Galbraith
Starr
Island
Island
13
55
80
41
29
45
30
45°00´00
550000m
80°22´34
51
52
20´
53
54
55
56
57
58
59
15´
560000m
61
62
63
64
65
10´
66
67
68
69
570000m
71
72
05´
73
74
75
76
77
78
80°00´00
37
580000m
81
83
84
40
36
60
Marble; may be associated with rusty graphitic schist
15c
Calc-silicate gneiss
4984000m
69
Coldwater
Lake
87
88
89
590000m
91
92
50´
93
trend only, limbs dip
Fold axis; minor fold,
94
Ardbeg
Dunchurch
Pointe au
Baril Station
69
Waubamik
Dillon
Synform, interpreted;
(with plunge)
unknown generation,
Fold axis; minor fold,
in opposite directions
(with plunge)
Mineral occurrences,
Fold axis; minor fold,
discretionary
m-asymmetry
occurrences (as
(with plunge)
classed by the
Mineral Deposit
Inventory (MDI))
(interpreted)
11
Orrville
35
Dorset
Rosseau
Port Sydney
141
BAY
Tobermory
Dwight
60
Huntsville
Parry Sound
117
Sans
Souci
Baysville
MacTier
118
P.3551
Bala
400
Lion's
118
Bracebridge
169
45°
Head
45°
Edenhurst
Honey
Harbour
Purple
Valley
LAKE
Penetanguishene
Gravenhurst
P.3552
Norland
Washago
12
Wiarton
HURON
81°
Shallow
Nottawasaga
Bay
Leith
26
Woodford
Midland
11
80°
12
169
79°
Orillia
48
Thornbury
427m
Location Map
Fenelon
Brechin
1 cm equals 25 km
SOURCES OF INFORMATION
Thematic information on this map is tied to a digital base map derived
from maps 41 H/1 and 31 E/4 of the National Topographic System,
scale 1:50 000.
Universal Transverse Mercator (UTM) co-ordinates
are in North American Datum 1983 (NAD83), Zone 17.
Location of isotopic
Limit of mapping;
Novar
Broadbent
Nobel
P.3550
Kearney
Sprucedale
McKellar
Red Bay
s-asymmetry
Magnetawan
Burk's Falls
P.3549
bA 978 ± 6
age determination
denotes limits of area
mapped during this
survey
Geological Survey of Canada Ontario Department of Mines 1953.
Aeromagnetics, Lake Joseph; Geological Survey of Canada Ontario
Department of Mines, Geophysical Map 126G, scale 1:63 360.
Geological Survey of Canada Ontario Department of Mines 1965.
Boundary of local to
Aeromagnetics, Sans Souci; Geological Survey of Canada Ontario
Department of Mines, Geophysical Map 1495G, scale 1:63 360.
retrogression of
mineral assemblages
to amphibolite-facies
ornamentation is on
the lower grade
(amphibolite-facies)
side (south)
Ontario Geological Survey 2002.
(MDI2)
Mineral Deposit Inventory Version 2
October 2002 Release; Ontario Geological Survey, Digital Data.
Cosca, M.A. 1989. Cooling and inferred uplift/erosion history of the
Grenville orogen, Ontario: constraints from Argon-40/Argon-39;
unpublished PhD thesis, University of Michigan, Ann Arbor, Michigan,
223p.
Culshaw, N.G., Corrigan, D., Drage, J. and Wallace, P. 1988. Georgian
Bay geological synthesis: Key Harbour to Dillon, Grenville Province of
Paper 88-1C, p.129-133.
ABBREVIATIONS
Cumming, G.L., Wilson, J.T., Farquhar, R.M. and Russell, R.D. 1955.
Some dates and subdivisions of the Canadian Shield; Geological
Association of Canada, Proceedings, v.7, p.27-79.
Ag ...............................................................silver
Au .................................................................gold
Lowdon, J.A. 1960. Age determinations by the Geological Survey of
Ce .............................................................cerium
Canada, Report 1: isotopic ages; Geological Survey of Canada, Paper
Cu.............................................................copper
60-17, 51p.
Fe ..................................................................iron
fel ............................................................feldspar
Stockwell, C.H. 1982. Proposals for time classification and correlation
gt ...............................................................garnet
of Precambrian rocks and events in Canada and adjacent areas of the
mica ............................................................mica
Canadian Shield. Part 1: A time classification of Precambrian rocks and
Mo...................................................molybdenum
events; Geological Survey of Canada, Paper 80-19, 135p.
Ni................................................................nickel
van Berkel, J.T. and Schwertdner, W.M. 1986. Precambrian geology of
peat ..............................................................peat
the Moon River area, Muskoka and Parry Sound districts; Ontario
REE......................................rare earth elements
Geological Survey, Preliminary Map P.2954, scale 1:50 000.
40
SM ..................................sulphide mineralization
Wasserburg, G.J. and Hayden, R.J. 1955. Ar
St an .......................................stone, anorthosite
Cosmochimica Acta, v.7, p.51-60.
Grey biotite leucogneiss of granodioritic composition
-K
40
dating; Geochimica et
Th ............................................................thorium
Wodicka, N., Parrish, R.R. and Jamieson, R.A. 1996. The Parry Sound
U ............................................................uranium
domain: a far-traveled allochthon? New evidence from U-Pb zircon
Zn..................................................................zinc
geochronology; Canadian Journal of Earth Sciences, v.33, p.1087-1104.
Magnetic declination approximately 10°42'W in 2004.
mA = muscovite Ar/Ar date, in Ma
Geology not tied to surveyed lines.
kK = potassium feldspar K/Ar date, in Ma
Metric conversion factor:
1 foot = 0.3048 m.
uW = uraninite Pb/Pb date, in Ma
zU = zircon U/Pb date, in Ma
CREDITS
Migmatitic Rocks
of granodioritic to monzodioritic composition
Geology by N.G. Culshaw, D. Corrigan, J.W.F. Ketchum, P. Wallace and
N. Wodicka, 1987 to 1990.
Migmatitic Rocks
Grey, leucocratic, migmatitic hornblende-biotite-garnet
Mafic Rocks
orthogneiss of tonalitic to granodioritic composition
12
Geological compilation by N.G. Culshaw, 1991 and 2004.
Metasedimentary Rocks
Unclassified paragneiss
11
Metasedimentary Rocks
45°00´00
95
Geology, legend and mineral deposit information reviewed by
R.M. Easton.
Cartographic production by S. MacLean.
Felsic Rocks
10
Metasedimentary Rocks
Intermediate to Felsic Granulites
To enable the rapid dissemination of information, this map has not
received a technical edit.
Discrepancies may occur for which the
Ontario Ministry of Northern Development and Mines does not assume
9
Metasedimentary Rocks
liability.
Users should verify critical information.
Grey, migmatitic, leucocratic garnet-biotite paragneiss,
locally with sillimanite; pink leucosome, may contain garnet,
Intermediate to Felsic Granulites (layered)
Issued 2004.
Information from this publication may be quoted if credit is given.
Bayfield Gneiss Association (units 6 to 8)
Intermediate to Felsic Rocks
Pink, sugary leucocratic gneiss
Intermediate to Felsic Granulites (retrogressed)
7
Intermediate to Felsic Intrusive Rocks
7a
Unsubdivided grey and pink, variably layered, highly
strained orthogneiss, in places with recrystallized
7b
Mafic Rocks
Grey, leucocratic, migmatitic hornblende-biotite-garnet
orthogneiss of tonalitic to granodioritic composition
Metasedimentary Rocks
36a
Layered paragneiss, garnet-rich granulite
36b
Marble, calc-silicate tectonic breccia
Metasedimentary Rocks
6a
Grey, leuco- to mesocratic garnet-biotite paragneiss,
commonly with sillimanite; locally graphitic and
rusty weathering
Calc-silicate and amphibolite gneiss associated with
garnet-biotite paragneiss of unit 6a
20
86
15b
6b
400
70
55´
Unclassified paragneiss
granulite or gneissic metagabbro
85
70
42
85
15a
Unsubdivided, layered, predominantly mafic two-pyroxene
42
82
Pink, sugary, layered leucocratic gneiss
43b
(granodiorite, tonalite to diorite) orthogneiss containing
40
50
20 46
55
38
51a
51a
Ahmic
Harbour
Grey, migmatitic, leucocratic hornblende-biotite orthogneiss
6
15
Metasedimentary Rocks
potassium feldspar megacrysts
70
18b
79
40
50
Mafic Rocks
(e.g., unit 39 or 40); pegmatite veins may be common
Lake
Byng
wR = whole rock Rb/Sr date, in Ma
8
18a
25
60
4
48b
80
29a
15
20
20
Monzonitic to granitic orthogneiss
granulite
30
37
40
68
Big Island
80
30
64
25
4984000m
42
43a
50
40
50a
53
r
15
15
49
29a
40
unknown generation,
South River
Sundridge
Magnetawan
Dyer's Bay
mK = muscovite K/Ar date, in Ma
Unsubdivided, buff to grey weathering, layered, feldspathic
15
55
80
65
34
18b
Lake
17b
Britt Domain (units 1 to 14)
evidence of retrogression from a granulite facies precursor
Home
50
30
80
15
55
51a
39
86
49
26
15
28
Pine Islands
Tate
27
60
6
45
30
80
85
80
40
50
Port Loring
North
P.3548 Britt
6
z-asymmetry
35
Pakesley
Harbour
muscovite, magnetite
87
Island
15
85
only
bK = biotite K/Ar date, in Ma
Intermediate to Felsic Rocks
Unsubdivided, grey to buff weathering, orthopyroxene-
Rabbit
38
Unclassified granitoid orthogneiss
Unsubdivided, grey, foliated to gneissic, intermediate
47b
40
83
40
Go
30
17a
Rusty weathering, graphitic paragneiss
Lake
45
Intermediate to Felsic Rocks
Quartzite
Buff to pink weathering, leucocratic granulite
88
35
e
iv
75
30
GIBSON TP
Lake
64
Pink to grey, migmatitic leucogranite to granodiorite
Pink, layered, leucocratic paragneiss
41
R
51a
60
65
Interlayered amphibolite, semi-pelitic gneiss and
Pink to grey leucocratic gneiss
18b
PARAUTOCHTHON NORTH OF PARRY SOUND DOMAIN
orthogneiss
Lunnen
50b
44
44c
18a
BASE OF LOWER GO HOME DOMAIN NOT OBSERVED
bearing intermediate (granodiorite, tonalite to diorite)
Island
Surerus
30
75
40
5
Turtle
48b
80
Island
10
Key
Commanda
St gr ...............................................stone, granite
15
PARRY SOUND DOMAIN (INTERIOR)
sh
32
40
60
50
67
15a
18b
86
Lake
20
62
45
65
Gunn
Amphibolite
er
ua
65
50b
Mafic orthogneiss
44b
TECTONIC CONTACT WITH SUBJACENT
60
31
28
80
67
Flatrock Lake
51a
45
15a
iv
35
61
50
Leclairc Lake
20
51a
87
44a
Felsic Rocks
Mafic orthogneiss
GIBSON I.R. 31
35
Gray
55
60
60
35
46°
Restoule
Si .................................................................silica
Mafic and Metasedimentary Rocks
89
R
70
45
25
30
30
60
35
55
42
48
24
50a
32
Grey hornblende-epidote-biotite tonalitic orthogneiss
Fossmill
Nb ...........................................................niobium
Intermediate to Felsic Rocks
Parry Sound Domain (interior) (units 36 to 41)
38
60
10
oo
n
15b
51a
20
19c
30
50
50
Island
21
M
84
87
35
Kiosk
79°
Powassan
Digital drafting by S. Josey.
48
53
20
47
10
52
Lake
27
Grey, migmatitic, tonalitic to granodioritic gneiss with
Honey Harbour Gneiss Association (units 15 to 18)
Amphibolite
30
80
56
55
38
64
42
Mu sq
Bands
18b
19b
PARAUTOCHTHON SOUTH OF PARRY SOUND DOMAIN
13
Irvine
70
43
69
20
45
18
Grey metatextite with pink, hornblende-epidote-bearing
47
58
51a
Tadenac
75
10
65
45
4990000m
18b
Lake
30
8
55
South Group
74
51a
Migmatitic Rocks
ALLOCHTHON-PARAUTOCHTHON BOUNDARY
14
400
49
55
26
Intermediate to Felsic Rocks
80°
Noëlville
Pickerel
Blackstone Lake Gneiss Association (units 42 and 43)
73
58
Steers
91
80
55
50
55
57
20
20
Quartzite
Nadeau Island Gneiss Association (units 9 to 14)
25
9
16
Grey, migmatitic layered gneiss
quartzite
25
15
63
13
32
47a
65
38
36
45
Adams
75
20
12
35
30
11
45
Bay
50
Pink, sugary, layered leucocratic gneiss
46b
44d
75
47
15
23
Tadenac
Island
18
46a
47a
32
80
Para-amphibolite
21e
11
Alban
(NADEAU ISLAND GNEISS ASSOCIATION):
55
80
50
10
10
29a
80
48b
Galla Lake
85
10
50
66
70
30
10
2
34
Peacock
18
20
45
32
51a
42
15a
45
22
51a
89
32
44
Bay
20
47a
67
30
40
60
Big David
Lake
27
46b
42
80
(trend only, inclined,
TECTONIC CONTACT WITH SUBJACENT BRITT DOMAIN
Felsic to Intermediate, Layered or Migmatitic Rocks
Lake
45
5
45
60
25
60
4990000m
Galla
Creek
44
45
60
18
29a
ers
Lake
Lake
18b
Lower
56
60
in
M
25
27
70
52
40
35
35
34
80
2
interpreted; trend
varied amounts of pink leucosome
White
McMaster
50
28
21d
leucosome
Grey, migmatitic tonalite to granodiorite orthogneiss
38
35
58
60
45
45
58
47
60
Calc-silicate gneiss
19a
6
44c
40
48b
60
46
92
15
62
44
25
10
35
75 80
U
19
16
68
56
42
65
30
20
89
16
55
30
18b
60
22
19
55
21c
Unsubdivided pink and grey leucocratic gneiss
Moon River Gneiss Association (units 44 to 46)
47
32
47
05´
60
38
25
11
6
29b
65
47a
55
10
20
24
45
20
Moon River Subdomain (units 42 to 46)
60
46a
50
14
65
57
30
I.R. 79
Ri
ve
r
52
56
65
38
53
72
46b
45
70
30
25
47a
12
17
on
Foliation
granulite-facies
17
45
61
37
34
MOOSE POINT
45
25
32
9
30
33
10
37
47a
M
o
35
Pink to grey marble
Ojibway Gneiss Association (units 19 and 20)
ALLOCHTHON
8
32
25
30
18b
30
21b
Ontario 1985 Mineral
Development Agreement (COMDA), a
GEORGIAN
extensive
INTRUSIVE CONTACT
68
42
32
34
25
29a
20
12
50
30
32
5
horizons
18
60
52
40
hanging-wall side
Medium to dark grey, biotite-rich quartz-plagioclase
paragneiss and schist ("Dillon schist") with quartzite
50
35
Metasedimentary Rocks
21a
EARLY MESOPROTEROZOIC to
45
60
21
LATE PALEOPROTEROZOIC
40
45
42
35
Moose Bay
34
30
2
25
27
30
35
91
e Bay
T w elv e Mil
2
80
14
47
15
27
25
20
35
St an
44b
29a
45
92
10
35
26
I.R. 79
O'Donnell Channel
5
Small outcrops of unit 47a or 47b hosted by adjacent
94
58
25
30
25
45
57
47a
28
MOOSE
PROVINCIAL NATURE RESERVE
44c
21
31
23
05´
85
52
47
53
Dark grey dioritic orthogneiss, possible hypabyssal
Lower Go Home Domain (units 15 to 18)
80
42
Grey tonalitic orthogneiss
tectonostratigraphic boundaries) (indicated by triangles)
56
42
(trend only, inclined,
Geological contact
Weakly foliated to gneissic, mafic intrusive complex
60
56
38
51
Anorthosite, gabbroic anorthosite, minor gabbro
country rock units (commonly found along
95
Myers
75
50
34
82
68
47a
47c
56
44c
25
20
9
37
46b
FREEMAN TP
80
16
38
50
55
67
70
6
24
60
8
44c
27
80
55
40
20
Weakly foliated to gneissic metagabbro, primary
Small outcrops of unit 48a or 48b hosted by adjacent
Lake
Lake
50
46b
the five-year Canada
Ontario; in Current Research, Part C, Geological Survey of Canada,
70
80
55
trend only, teeth on
intrusion (circa 1450 Ma)
Unit 50a, with associated pink granite and grey
Buckhorn
St an
47a
70
Intermediate Rocks
22b
consisting of gabbro, anorthosite and ultramafic rocks
21
Felsic Rocks
22a
Weakly foliated to gneissic, grey hornblende-biotite
48c
47b
25
St gr
75
40
Unit 51a, with associated granite and monzonite
Hornblende diorite, gabbro
47a
Gooley
44b
Intermediate to Felsic Rocks
Weakly foliated to gneissic, pink monzonite, minor
Mafic Intrusive Rocks, Anorthosite Suite
47
Haggart Lake
9
65
21
15
38
38
37
47a
10
26
26
30
Unit 52a, strongly foliated to protomylonitic
96
36
Lake
65
unknown generation
prospects,
22
country rock units (indicated by dots)
40
44c
35
44c
35
22
93
58
Thrust fault, interpreted;
subhorizontal)
grey, migmatitic leucogneiss
Unit 52a, with associated granite and quartz monzonite,
48b
36
54
4
48
23
44b
47a
45
21
20
44c
29
North Group
30
38
71
22
Island
Western Islands
47
38
65
47a
15
21
45
45
46a
foliation;
Antiform, interpreted;
Pink, migmatitic, sugary leucocratic gneiss and subordinate
igneous texture commonly preserved
45
45
75
40
47a
North
River
27
40
52
94
57
48a
4
44a
25
24
23
Mafic Intrusive Rocks
48
2
Vaughan
Bay Geological Synthesis, funded as part of
Inlet
mineral assemblages;
97
57
26
Moon
42
40
Lake
51
Arnolds Bay
25
40
37
46b
47
31
25
75
26
47a
8
25
47
45
26
70
60
65
47
52
18
14
85
15
42
trend only
Lineation (with plunge,
hornblende, biotite, epidote
Intermediate Intrusive Rocks
15
28
46b
Pink, leucocratic granite, locally potassium feldspar
granodiorite and monzodiorite
50
70
35
65
10
18
PARK
68
18
35
Grey, layered quartzofeldspathic gneiss containing
Weakly foliated to gneissic, grey tonalite with associated
80
34
36
25
49
75
52
52
35
15
55
24
granodiorite
46b
80
20
44a
50b
98
27
48
30
layering and/or
in opposite directions
minor tonalite
Foot's Bay
27
65
46a
65
65
Fault, interpreted;
vertical)
35
granodiorite, locally potassium feldspar megacrystic,
24
53 25
45
31
Intermediate to Felsic Rocks
Intermediate to Felsic Intrusive Rocks
50a
20
20
11
44c
30
20
30
60
47
25
50
47
63
33
38
38
20
77
42
80
41
40
48
40
13
40
44c
22
28
36
PROVINCIAL
38
64
70
24
34
MASSASAUGA
30
41
50
33
37
31
73
75
42
70
9
15
20
25
U
66
35
60
32
Lake
51b
612
86
Park Lake
65
70
50
Eagle
34
99
80
37
Compositional
vertical)
Felsic to Intermediate Intrusive Rocks
51a
23
50
30
51
27
45
51
Stewart
U
53
46a
26
52c
37
71
65
44
44a
24
River
37
43b
20
36
10
39
35
40
28
38
Dock
35
46
45
47
55
U
mapping program, Project C.2.3, Georgian
Trout Creek
parallel tectonic
Felsic Rocks
ALLOCHTHON-PARAUTOCHTHON BOUNDARY
25
55
35
TECTONIC CONTACT WITH SUBJACENT LOWER GO HOME DOMAIN:
syenite
30
42
42
30
80
25
55
18
10
Bay
15
Moon Bay
33
43
Manitou
60
45
80
35
44c
45
30
25
44b
65
Mapping was conducted as part of a three-year
46°
Lineament,
commonly potassium feldspar megacrystic
Lake
MacTier
37
45
Moon
67
26
42
44b
46b
38
66
23
48
24
25
44
40
55
43
55
55
60
68
27
Island
30
46
35
43b
67
27
47b
24
70
2
Lake
40
52b
5000000m
69
36
75
43a
35
26
50
40
THE
30
18
25
77
43
75
37
68
21
49
45
37
66
30
75
32
25
megacrystic
40
30
67
28
44
30
55
peat
30
SYMBOLS
Pink, sugary leucocratic granite gneiss
Felsic Intrusive Rocks
52a
Ricketts Lake
36
MacRae
gt
30
Island
50
e
31
55
30
35
22
46a
75
70
52
10
60
63
25
Ju n iper La k
26
COMMONLY CONTAINING GARNET
Lake
47
peat
77
44a
54
43b
66
50
01
U
39
30
44c
62
Moon
36
55
75
31
60
40
47a
27
45
30
31
39
63
82
75
62
47
37
62
65
80
40
25
44
37
32
35
80
30
26
54
zU 1317 ± 24
50
70
43
29
46
70
41
65
75
Lake
44
DEFORMED AND MIGMATITIC ORTHOGNEISS,
55
18
55
35
41
64
48
70
56
46
80
52
34
33
38
Woods
50
35
Little
Juniper
"SINGLE CYCLE PLUTONIC ROCKS", VARIABLY
59
30
Fenton
Geological Survey.
French River
Metasedimentary Rocks
trend only, limbs dip
60
38
46b
15
15
58
36
44
42
Bay
20
44
42
26
32
35
46
57
This map is published with the permission of the Director, Ontario
69
Sand Bay Gneiss Association (units 21 to 24)
43a
65
Queen's Printer for Ontario, 2004.
81°
Shawanaga Domain (units 19 to 24)
52
56
45
44b
13
50
60
61
29
41
Kapikog Lake
60
45
©
Panache
coarse-grained, locally ophitic textured, metagabbro
35
40
15
18
36
Mafic Rocks
Layered to podiform calc-silicate gneiss
56
80
47
27
2 km
Agreement (ERDA) signed by the governments of Canada and Ontario.
Mafic orthogneiss, amphibolite
25
46a
42
28
1
subsidiary agreement to the Economic and Regional Development
Grey, migmatitic tonalitic and granodioritic orthogneiss
INTRUSIVE CONTACT
53
35
44a
68
50
31
46b
50
32
Bay
65
52
31
60
correspond to a suite or a complex.
29b
Dark green to black, weakly foliated to gneissic, medium- to
23
C
re
ek
46b
65
43
30
40
42
48
75
44
65
50
50
62
55
65
23
37
65
70
36
56
97
47
70
62
60
50
60
43
18
r
1983 North American Stratigraphic Code, in most cases, they would
Mafic Intrusive Rocks, Coronitic Metagabbro Suite
(circa 1165 Ma)
02
41
45
31
53
10´
51
46
50
C
o
n
g
e
35
If it were decided to
29a
Grey, migmatitic tonalitic and granodioritic orthogneiss
23
45
41
49
49
53
43b
50
Woods
40
47
75
29
45
70
70
40
43
40
40
48
er
70
38
21
45
75
30
44c
47a
55
41
20
iv
26
45
48
40
60
55
66
70
28
44
42
42
32
R
62
Sharpe Island
60
67
55
54
52
65
70
41
40
70
25
37
45
63
40
400
41
68
35
43b
82
57
40
35
80
metamorphism or intrusion of mafic dikes.
Unit 54a, with associated anorthosite and gabbro pods
and slivers
52
28
46
66
36
67
98
55
54
60
42
20
53
50
41
21
71
44c
38
55
30
70
Lake
40
Healey Lake
60
50
61
75
77
40
50
42
52
15
72
Moon Bay
60
85
50
84
66
31
70
40
71
North
45
45
40
54b
60
24
50
Hutcheson
Culshaw et al. (1988), that is primarily based on rock type, but which
Weakly foliated to gneissic mafic rocks of unknown
facies metamorphism and variably retrogressed
03
55
60
46b
35
66
80
24
65
80
26
57
47a
63
gneiss association is an informal stratigraphic term, introduced by
Intermediate to Felsic Rocks
Pere Brebeuf Gneiss Association (units 25 and 26)
protolith and of varied age, subjected to eclogite
27
32
Thus, not all
map units in the legend may appear on the map face.
formally name a "gneiss association" as a lithodemic unit under the
Mafic Rocks
54a
27
43b
39
45
40
44a
42
Channel
69
46
42
72
32
63
50
La Force Lake
67
42
80
66
47
70
80
75
75
26
56
84
50
80
54
86
74
65
Wreck Island
80
30
42
27
Maps P.3548, P.3549, P.3550, P.3551 and P.3552.
also may contain information with respect to plutonic history,
Grey, heterogeneous, leucosome-rich (>25%),
0
Killarney
29
45
50
85
69
CONGER TP
19
62
35
64
24
35
37
40
56
56
35
36
40
85
40
38
37
71
66
55
36
65
5000000m
e
g
35
laboratory investigations, including petrography and geochemistry.
This is a legend common to Ontario Geological Survey Preliminary
A
1000 m
NTS References: 41 H/1, 31 E/4
This legend is a field legend that locally incorporates the results of
30
43a
5
53
52
r
75
53
60
o
n
57
25
30
65
73
HIGH-GRADE METAMORPHISM
54
54
63
38
67
23
39
80
26
25
45
iv
e
70
50
20
65
40
Copperhead
65
18
25
40
Island
34
37
80
65
52
50
45
48
04
U,Th
50
38
MESOPROTEROZOIC
WITHIN THE GRENVILLE PROVINCE
30
22
65
Lake Joseph
25
45
56
40
a
72 45
45
43a
Straight and mylonitic gneiss derived from units 1a
migmatitic granodioritic gneiss
Lake Joseph
80
Unit 1a, with minor amounts of unsubdivided polycyclic
and/or 1b
c
INTRUSIVE CONTACT
Siding
80
68
32
65
35
45
80
74
52
Island
66
65
75
Barnard
36a
37
80
40
32
35
Moon
80
Harbour
30
Island
70
79
37
85
25
63
Wahsoune
66
35
60
R
44
56
37
62
75
45
80
80
25
47
C
e
75
88
37
65
80
65
45
62
51
75
70
Blackstone
55
37
73
60
38
17
70
29
80
9
n
52
75
01
Island
75
39
42
o
82
10´
Miron
35
46
49
31
70
25
50
40
61
20
43b
1c
LOCATED WITHIN THE PARRY SOUND SHEAR ZONE
Brown weathering, fine- to medium-grained diabase
Dock
No
leucosome older than the dikes is observed
b
29
(590 Ma)
05
47
st
Souci
63
55
70
28
85
73
44
59
70
52
54
40
ck
50
Sans
60
02
29
50
30
Metasedimentary Rocks
Mafic Intrusive Rocks (Grenville diabase dike swarm)
55
Loucks Lake
64
45
CONGER TP
Gneiss Association (unit 30)
75
20
23
70
la
B
44
38
80
80
35
23
43
55
60
43
35
28
75
n
oo
M
Island
14
50
56
40
30
73
43b
35
37
metamorphosed mafic dikes (amphibolite).
Pine Island Gneiss Association (units 27 to 29)
45
35
70
70
Lake
40
peat
42
Para-amphibolite and unsubdivided paragneiss; includes
1b
SANS SOUCI AREA
Scale 1:50 000
Mostly medium-grained, moderately foliated to gneissic,
migmatitic, granodiorite to tonalite containing
Upper Go Home Domain (units 25 to 29)
37
61
72
35
56
44
67
72
58
50
18
60
50
55
74
Cu
30
37
60
42
Intermediate Migmatitic Rocks
1
Mafic and Metasedimentary Rocks
NEOPROTEROZOIC
35
McQuillan
53
50
60
40
Amphibolite
and metasedimentary gneiss
PRECAMBRIAN
06
16
42
41
70
Little Blackstone Lake
41
75
43b
Mafic Rocks
TECTONIC CONTACT (SUSPECT) WITH THE SHAWANAGA DOMAIN,
40
55
42
44
sillimanite gneiss; minor quartzite, calc-silicate gneiss
Quartzite, minor associated paragneiss
Gneissic Rocks Structurally Below the Lighthouse
60
65
43b
50
37
45
43a
locally with garnet-hornblende and garnet-kyanite and
granodiorite orthogneiss
grey to white sublithographic to lithographic limestone)
40
31
35
80
68
80
Layered, pink to grey quartz-feldspar-biotite paragneiss,
Layered, migmatitic, grey tonalite, minor trondhjemite,
Grey biotite-muscovite-garnet-kyanite gneiss and schist
Bay
Ontario Geological Survey
PRECAMBRIAN GEOLOGY
33a
UNCONFORMITY
65
15
30
Lake
50
45
47
10
70
50
73
70
77
Bay
70
Skidway
80
25
76
Rawson
26
85
Crooked
70
Fryingpan
Port
60
Island
76
46
45
45
37
50
37
56
40
55
40
23
34
45
54
21
37
75 57
50
80
61
Island
71
45
65
Pennsylvania
39
65
70
80
40
Souci
40
76
68
64
66
64
31
80
85
60
45
70
37
52
72
63
84
42
Mafic monzodiorite gneiss
Intermediate to Felsic Rocks with Metadiabase Dikes
grey to blue-grey interbedded limestone and dolostone,
Gordon
43b
Mafic gneiss; minor metagabbro, anorthositic gneiss
3b
Unsubdivided: includes Gull River Formation (light brown-
arkosic sandstone, pebbly sandstone, siltstone and shale)
42
60
80
40
65
75
70
Island
03
75
37
Sans
58
PROVINCIAL PARK
36
3a
Metasedimentary Rocks
quartzofeldspathic gneiss and minor quartzite
Chemical Sedimentary Rocks
36
45
70
67
Quartzite, minor associated paragneiss and para-amphibolite
and Shadow Lake Formation (calcareous red and green
26
43a
15
43b
60
54
36
43
80
60
33
52
38
73
80
53
56
45
45
55
Echo
88
56
47
07
25
34
43a
45
Bay
36
Lake
22
40
45
THE MASSASAUGA
70
56
Island
52
70
72
25
35
60
60
52
72
52
82
Lake
Lake
40
36
85
20
36
25
ek
39
39
04
56
50
Hines
Bround
35
47b
35
20
44
60
45
40
75
35
85
37
Wilcox
70
16
60
37
65
37
40
Island
73
56
52
60
70
54
48
45
32
Gordon
20
30
42
26
85
Lake
74
88
Pauls
70
64
50
Lake
75
37
36a
81
69
56
Crane Lake
50
25
40
43a
re
C
39
39
39
49
37
70
25
Peanut
Lake
67
68
37
69
80
60
10
41
58
46
15
56
36
Krapek Lake
45
Mafic Rocks
3
pelitic and garnet-rich gneiss interlayered with
25
34
Lake
73
31
MIDDLE ORDOVICIAN
Stanley House
60
Lake
50
15
40
25
Lake
Payne
Oldfield
Mafic and Metasedimentary Rocks
t
36a
82
50
75
62
45
Warnica
58
58
64
Spider Lake
Clear
35
40
37
37
60
80
80
5
05
51
60
55
zU 1300 ± 17
48
67
87
66
50
06
81
74
40
45
81
08
54
Lake
Predominantly grey gneiss with pink granitic leucosome
1a
a
Islands
69
75
37
65
57
56
75
41
70
40
50
78
35
Island
40
65
20
45
40
4c
ORDOVICIAN
44
37
45
45
43b
47b
56
37
47
65
22
17
39
55
Portage
quartzite
33b
32
34
Nb,Si
Pink, sugary leucocratic gneiss
Bustard Islands Gneiss Association (unit 1)
PALEOZOIC
Lake
25
fel,U,Th,
48
60
37
85
61
35
51
33
UNCONFORMITY
Tiffin
30
40
70
42
and till
09
40
50
70
70
50
73
78
43a
Unsubdivided pink and grey leucocratic gneiss
4b
2
Glacial deposits; sand and gravel, clay
Hamer Bay
75
R
37
64
40
14
29
55
45
Lake
26
57
38
70
36
Blackstone
50
82
70
41
25
6
Lake
Nb
28
31
38
17
Burnt
30
Lake
Lake
55
38
64
69
58
4a
Para-amphibolite, layered mafic gneiss, paragneiss and
Lighthouse Gneiss Association (units 31 to 33)
29
42
gt,mica
35
Stonehouse
11
56
40
85
Zr,Th,Nb,
75
65
70
37
65
74
48
26
Asperitas
40
55
35
69
43
60
40
80
Zn,Fe
82
Island
20
48a
Cu,SM,
Lake
Lake
26
26
40
41
Corbier
Crane
80
Island
80
85
21
34
PLEISTOCENE
27
Th,U
61
43b
U,fel,REE,
30
Traves
10
Falkner
71
Bernyk
45
38
59
37
65
37
25
75
37
65
78
56
75
31
Intermediate to Felsic Rocks
4
Mafic Rocks
:
MAP P.3551
Lake, stream and swamp deposits
10
Hamer Lake
35
fel,
28
47b
uW 984, kK 985 ± 40
73
mK 995 ± 60
35
RECENT
bK 839 ± 80, uW 976,
50
mK 940 ± 60
61
QUATERNARY
kK 761 ± 70
45
47b
75
30
56
70
zU 1163 ± 3
47
Umbrella
65
45
69
33a
67
54
25
U,fel
27
REE,U
35
mA 860 ± 3
Ce,Si,
23
fel
Multicomponent layered gneiss and migmatite, minor
Armer Bay Gneiss Association (units 34 and 35)
CENOZOIC
Lake
20
Mo,
Intermediate to Mafic Migmatitic Rocks
5
Parry Sound Domain (basal) (units 30 to 35)
37
Roberts
fel
Th,Nb
72
25
47
Lake
48
80
30
52
15
25
75
56
40
70
71
80
54a
Ch
07
37
45
52
54a
54
Au
20
48
Lake
Kingshott
62
45
55
25
45
62
70
60
75
65
80
65
McEachern
Key Harbour Gneiss Association (units 2 to 5)
LOCATED WITHIN PARRY SOUND SHEAR ZONE
amphibolite
5011000m
27
fel,REE,
THRUST CONTACT WITH PARRY SOUND DOMAIN (BASAL),
45°15´00
400
50
57
10
abc
32
30
64
70
17
77
Lake
70
64
30
37
70
50
60
Cu,Ni
70
Clear
42
Island
37
82
Lake
36a
61
Lent
31
52
35
47a
37
60
Spider
39
48
80
35
Cu
Zn,Cu
SM,gt,
37
74
40
Zn,Mo,
65
50
70
Ag,Cu,
53
22
60
34
Au,Cu,SM
61
80
45
20
42
08
Fe,Ni
70
55
52
50
25
48
37
40
65
599000m
98
PHANEROZOIC
85
Lake
22
82
42
68
34
24
75
48a
70
75
FOLEY TP
80
40
Lake
41
39
66
70
25
26
58
38
59
53
Lake
COWPER TP
42
47
35
25
Salmon
Lake
40
39
36a
37
41
39
80
25
Ansley
31
75
50
47
67
32
26
Hooton
Oak Lake
Blackstone
11
80
One Island
47
45
40
22
Island
32
62
39
33
Peak
46
Boyd
41
41
74
Island
75
13
24
72
09
47
55
Louisa
75
Ni
19
32
50
59
Spider Lake
35
34
39
56
45
33a
65
28
55
25
45
Island
45
70
45
29
37
Derbyshire
33a
34
Ni
92
LEGEND
79°43´33
45´
97
96
95
94
93
45
50
30
39
ke
56
55
54
a
53
91
590000m
89
88
87
86
84
83
82
81
580000m
79
L
20´
80°00´00
78
77
76
75
74
r
52
51
71
570000m
69
68
67
66
73
72
River
ne
to
ks
550000m
65
05´
B lac
80°22´32
15´
10´
50´
96
97
98
45´
99
600000m
79°43´29
It is
recommended that reference to this map be made in the following
form:
Culshaw, N.G., Corrigan, D., Ketchum, J.W.F., Wallace, P. and
Wodicka, N. 2004. Precambrian geology, Sans Souci area; Ontario
Geological Survey, Preliminary Map P.3551, scale 1:50 000.
60
7
50
Inlet
15
13
20
eb
es
h
55
13
40
40
16
14
62
52
30
17
25
McCoy
42
Island
34
44
Osawa
14
30
15
16
20
4
McCoy
Island
Southwest
Island
10
69
9
52b
Islands
75
Twin
13
90
14
41
55
77
76
7
27
10
9
10
15
20
62
23
55
30
9
2
22
11
40
77
87
5
6
45
62
5
15
72
LIMESTONE
60
38
7
ISLANDS
12
13
St ls
25´
PROVINCIAL
56
22
NATURE
10
12
North Limestone
Island
44
46
10
49
27
5
10
18
52b
15
34
15
7
8
50
44
30 11
Island
20
4
Beaver
20
68
10
65
52
10
72
51
22a
89
33
54a
36
Island
50
l
e
76
Island
n
25
20
19b
15
Limestone
Islands
26
Boucher
20
20
56
LIMESTONE
19a
Lake
70
60
40
45
Wallis
Stalker
Rocks
30
9
RESERVE
15
Snug
Snug
45
52b
15
U,Si,ap
12
B
li
n
35
40
o
23
d
B
ll
19b
in
s
B
18
20
15
25
24
20
80
7
Spectacle
Islands
6
70
Snug
11
9
9
5
Haven
23
19a
24
55
13
53
55
38
19b
23
23
9
60
18
7
15
22
Gowar
4
67
12
22
Parry
Is
la
23
20
n
d
24
Pleasant Island
44
43
21
28
38
20
50b
28
31
5020000m
Snake
35
53
17
23
12
18
Georgian Bay
21
9
19a
71
18
60
15
74
Painkiller
48
57
31
8
33a
38
35
69
40
40
23
22a
19b
11
24
60
45
72
62
21a
Cathcart
70
50
23
62
62
33a
56
80
45
45
24
45
40
mA 905 ± 3
70
80
30
72
54
14
82
62
48
U
Ingersoll
85
Stapley
30
Island
33a
Island
44
53
30
70
78
33a
40
70
Parry Island
Bay
20
33a
60
85
50
70
12
70
63
85
65
65
80
31
68
29
30
Island
46
17
20
Narrows
40
26
37
39
85
33a
35
60
80°33´38
535000m
36
37
38
540000m
39
30´
41
43
44
45
25´
46
47
48
49
550000m
51
52
20´
53
54
55
56
57
58
560000m
61
62
63
64
65
10´
66
67
68
63
39
gt,Mo,
35
570000m
65
16
66
82
39
45
45
57
70
34
75
Lake
40
71
72
05´
74
75
76
77
78
79
80°00´00
580000m
81
82
35
50
84
85
55´
87
Orrville
Parry Sound
11
35
Dorset
Port Sydney
141
BAY
Tobermory
Dwight
60
Huntsville
117
Sans
Souci
Dyer's Bay
Baysville
MacTier
6
P.3551
118
400
Bala
Lion's
118
Bracebridge
169
Edenhurst
Purple
Valley
LAKE
Penetanguishene
45°
unknown generation,
Fold axis; minor fold,
trend only, limbs dip
z-asymmetry
in opposite directions
(with plunge)
Synform, interpreted;
Fold axis; minor fold,
unknown generation,
m-asymmetry
trend only, limbs dip
(with plunge)
in opposite directions
Gravenhurst
P.3552
Red Bay
Washago
12
Wiarton
HURON
Antiform, interpreted;
Honey
Harbour
81°
Nottawasaga
Bay
Leith
Shallow
Midland
11
80°
169
79°
Orillia
12
48
Brechin
26
1 cm equals 25 km
Location Map
SOURCES OF INFORMATION
Thematic information on this map is tied to a digital base map derived
from maps 41 H/7 & 41 H/8, and 31 E/5 of the National Topographic
Geological contact
Mineral occurrences,
(interpreted)
prospects,
discretionary
Limit of mapping;
occurrences (as
denotes limits of area
classed by the
mapped during this
Mineral Deposit
survey
Inventory (MDI))
System, scale 1:50 000.
Universal Transverse Mercator (UTM)
co-ordinates are in North American Datum 1983 (NAD83), Zone 17.
Geological Survey of Canada Ontario Department of Mines 1953.
Aeromagnetics, Seguin Falls; Geological Survey of Canada Ontario
Department of Mines, Geophysical Map 127G, scale 1:63 360.
Geological Survey of Canada Ontario Department of Mines 1965.
Boundary of local to
Location of isotopic
bA 978 ± 6
extensive
retrogression of
granulite-facies
mineral assemblages
to amphibolite-facies
mineral assemblages;
age determination
ornamentation is on
the lower grade
(amphibolite-facies)
side (south)
Aeromagnetics, Parry Sound; Geological Survey of Canada Ontario
Department of Mines, Geophysical Map 1496G, scale 1:63 360.
Ontario Geological Survey 2002.
Mineral Deposit Inventory Version 2
(MDI2) October 2002 Release; Ontario Geological Survey, Digital Data.
Bussy, F., Krogh, T.E., Klemens, W.P. and Schwerdtner, W.M. 1995.
Tectonic and metamorphic events in the westernmost Grenville
Province, central Ontario: new results from high-precision U-Pb zircon
geochronology; Canadian Journal of Earth Sciences, v.32, p.660-671.
Connare, K.M. and McNutt, R.H. 1985. Rb-Sr geochronology of the
Nobel gneiss and McKellar gneiss, Parry Sound region, Ontario; in
Current Research, Part A, Geological Survey of Canada, Paper 85-1A,
p.175-180.
ABBREVIATIONS
Cosca, M.A. 1989. Cooling and inferred uplift/erosion history of the
Grenville orogen, Ontario: constraints from Argon-40/Argon-39;
unpublished PhD thesis, University of Michigan, Ann Arbor, Michigan,
ap .............................................................apatite
223p.
Al .........................................................aluminum
Culshaw, N.G., Corrigan, D., Drage, J. and Wallace, P. 1988. Georgian
Au.................................................................gold
Bay geological synthesis: Key Harbour to Dillon, Grenville Province of
clay ...............................................................clay
Ontario; in Current Research, Part C, Geological Survey of Canada,
Co..............................................................cobalt
Paper 88-1C, p.129-133.
Cu.............................................................copper
40
39
post-tectonic cooling in the Britt domain of the Grenville Province,
18a
Pink to grey leucocratic gneiss
gt ...............................................................garnet
Ontario; Earth and Planetary Science Letters, v.105, p.405-415.
18b
Pink to grey, migmatitic leucogranite to granodiorite
mb ............................................................marble
Ar/
Ar study of
mica .............................................................mica
Ketchum, J.W.F., Heaman, L.M., Krogh, T.E., Culshaw, N.G. and
Intermediate to Felsic Rocks
Mo...................................................molybdenum
Jamieson, R.A. 1998. Timing and thermal influence of late orogenic
17a
Unclassified granitoid orthogneiss
Nb...........................................................niobium
extension in the lower crust: a U-Pb geochronological study from the
17b
Monzonitic to granitic orthogneiss
Ni ...............................................................nickel
southwest Grenville orogen, Canada; Precambrian Research, v.89,
peat
p.25-45.
............................................................peat
Mafic Rocks
Si.................................................................silica
Mafic orthogneiss
SM...................................sulphide mineralization
Ketchum, J.W.F. and Krogh, T.E. 1997. U-Pb constraints on high-
St an .......................................stone, anorthosite
pressure metamorphism in the Central Gneiss Belt, southwestern
Metasedimentary Rocks
St gb..............................................stone, gabbro
Grenville orogen; Geological Association of CanadaMineralogical
15a
Unclassified paragneiss
St gn...............................................stone, gneiss
Association of Canada, Programs with Abstracts, v.22, p.A-78.
15b
Marble; may be associated with rusty graphitic schist
St gr...............................................stone, granite
15c
Calc-silicate gneiss
St ls ...........................................stone, limestone
Krogh, T.E. and Davis, G.L. 1969. Geochronology of the Grenville
St mb .............................................stone, marble
Province; Carnegie Institution of Washington, Yearbook 67, p.224-230.
Ti.............................................................titanium
U.............................................................uranium
Reynolds, P.H., Culshaw, N.G., Jamieson, R.A., Grant, S.L. and
Zn..................................................................zinc
McKenzie, K. 1995.
40
39
Ar/
Ar traverse - Grenville Front Tectonic Zone
bA = biotite Ar/Ar date, in Ma
Metamorphic Geology, v.13, p.209-221.
Thermobarometry, geochronology and the interpretation of P-T-t data
tU = titanite U/Pb date, in Ma
in the Britt domain, Ontario Grenville orogen, Canada; Journal of
Intermediate to Felsic Rocks
Grey, migmatitic, leucocratic hornblende-biotite orthogneiss
zU = zircon U/Pb date, in Ma
Petrology, v.33, p.1225-1259.
43a
Pink, sugary, layered leucocratic gneiss
of granodioritic to monzodioritic composition
43b
Grey biotite leucogneiss of granodioritic composition
van Breemen, O., Davidson, A., Loveridge, W.D. and Sullivan, R.D.
Migmatitic Rocks
1986. U-Pb zircon geochronology of Grenvillian tectonites, granulites
Mafic Rocks
Grey, leucocratic, migmatitic hornblende-biotite-garnet
and igneous precursors, Parry Sound, Ontario; in The Grenville
Amphibolite
orthogneiss of tonalitic to granodioritic composition
Province, Geological Association of Canada, Special Paper 31, p.191-
12
Metasedimentary Rocks
Unclassified paragneiss
43a
37
13
Lake
Wodicka, N., Parrish, R.R. and Jamieson, R.A. 1996. The Parry Sound
36
35
16
37
48
26
400
Tucker
Magnetic declination approximately 10°36'W in 2004.
Felsic Rocks
10
Metasedimentary Rocks
Rusty weathering, graphitic paragneiss
Geology not tied to surveyed lines.
Metasedimentary Rocks
Metric conversion factor:
Intermediate to Felsic Granulites
Unsubdivided, grey to buff weathering, orthopyroxene-
9
bearing intermediate (granodiorite, tonalite to diorite)
Grey, migmatitic, leucocratic garnet-biotite paragneiss,
orthogneiss
locally with sillimanite; pink leucosome, may contain garnet,
CONGER TP
47
5012000m
38
40
35
15
66
Bayfield Gneiss Association (units 6 to 8)
590000m
91
50´
CREDITS
Intermediate to Felsic Granulites (retrogressed)
Intermediate to Felsic Rocks
Pink, sugary leucocratic gneiss
Unsubdivided, grey, foliated to gneissic, intermediate
7
Intermediate to Felsic Intrusive Rocks
7a
Unsubdivided grey and pink, variably layered, highly
strained orthogneiss, in places with recrystallized
7b
Mafic Rocks
Grey, leucocratic, migmatitic hornblende-biotite-garnet
orthogneiss of tonalitic to granodioritic composition
Unsubdivided, layered, predominantly mafic two-pyroxene
Metasedimentary Rocks
Metasedimentary Rocks
6a
Grey, leuco- to mesocratic garnet-biotite paragneiss,
36a
Layered paragneiss, garnet-rich granulite
commonly with sillimanite; locally graphitic and
36b
Marble, calc-silicate tectonic breccia
rusty weathering
Calc-silicate and amphibolite gneiss associated with
garnet-biotite paragneiss of unit 6a
Geology by N.G. Culshaw, D. Corrigan, J.W.F. Ketchum, P. Wallace and
N. Wodicka, 1987 to 1990.
Geological compilation by N.G. Culshaw, 1991 and 2004.
Digital drafting by S. Josey.
Geology, legend and mineral deposit information reviewed by
R.M. Easton.
Cartographic production by S. MacLean.
To enable the rapid dissemination of information, this map has not
received a technical edit.
Discrepancies may occur for which the
Ontario Ministry of Northern Development and Mines does not assume
liability.
Users should verify critical information.
Issued 2004.
Information from this publication may be quoted if credit is given.
45°15´00
89
1 foot = 0.3048 m.
Intermediate to Felsic Granulites (layered)
6b
Lake
geochronology; Canadian Journal of Earth Sciences, v.33, p.1087-1104.
Pink, layered, leucocratic paragneiss
granulite or gneissic metagabbro
70
66
88
11
Metasedimentary Rocks
potassium feldspar megacrysts
17
86
Nobel
Culshaw, N., Reynolds, P.H. and Check, G. 1991. A
60
Clear
55
40
53
83
Novar
Broadbent
Migmatitic Rocks
evidence of retrogression from a granulite facies precursor
60
50
73
56
50
30
GEORGIAN
Kearney
Sprucedale
McKellar
69
Waubamik
Dillon
hA = hornblende Ar/Ar date, in Ma
6
82
27
25
Baril Station
Tuccillo, M.E., Mezger, K., Essene, E.J. and van der Pluijm, B.A. 1992.
(granodiorite, tonalite to diorite) orthogneiss containing
38
37
60
42
Lake
49
Dunchurch
wR = whole rock Rb/Sr date, in Ma
60
60
U
38
14
13
40
50
35
Lake
Lake
Sovereign
81
43b
75
Salmon
only
(with plunge)
35
Magnetawan
Burk's Falls
Ardbeg
fel............................................................feldspar
Britt Domain (units 1 to 14)
8
30
Forget
Fold axis; minor fold,
s-asymmetry
35
Ahmic
Harbour
Inlet
Fe..................................................................iron
(e.g., unit 39 or 40); pegmatite veins may be common
75
50
35
37
Lake
Third
41
43
45
34
50
interpreted; trend
35
Byng
to Britt Domain, Grenville Province, Ontario, Canada; Journal of
Unsubdivided, buff to grey weathering, layered, feldspathic
35
Second
60
16
75
South River
Sundridge
Magnetawan
Felsic Rocks
granulite
40
40
85
HUMPHREY TP
37
54
Long Arm
Port Loring
North
mA = muscovite Ar/Ar date, in Ma
55
Road
38
61
37
Nb
75
62
45
65
86
Pakesley
P.3548 Britt
muscovite, magnetite
37
30
60
37
51
15
39
69
40
65
35
40
Road
Lineament,
Grey hornblende-epidote-biotite tonalitic orthogneiss
PARAUTOCHTHON NORTH OF PARRY SOUND DOMAIN
37
37
34
70
76
70
43
49
64
mb
Hayes Corners
42
25
Rosseau
Black
Cu
73
21
70
35
85
56
37
37
48
30
75
40
80
75
24
41
36
44
SM,Au
8
85
38
First
65
Key
Commanda
45°
Grey, migmatitic, tonalitic to granodioritic gneiss with
Quartzite
Buff to pink weathering, leucocratic granulite
45
75
72
39
61
12
53
40
16
40
40
Lake
85
55
72
Interlayered amphibolite, semi-pelitic gneiss and
46°
Pickerel
207.
52
fel
Cu,SM,Ni
Lake
13
81
40
Scime
70
45
44c
Parry Sound Domain (interior) (units 36 to 41)
37
30
80
75
79
50
72
Amphibolite
TECTONIC CONTACT WITH SUBJACENT
68
70
27
Lake
Grey metatextite with pink, hornblende-epidote-bearing
17
Lake
41
44
80
45
74
19a
Fossmill
domain: a far-traveled allochthon? New evidence from U-Pb zircon
Windfall
Cu,SM,Ni
36
16
80
Cu,Mo,SM
Legged
36a
Lake
55
41
Lake
21
Rankin
63
67
11
47
45
65
55
85
36a
39
80
Mafic orthogneiss
44b
80
80
55
30
Lake
80
80
57
59
67
74
80
15
Migmatitic Rocks
BASE OF LOWER GO HOME DOMAIN NOT OBSERVED
PARRY SOUND DOMAIN (INTERIOR)
3
86
78
45
75
SM
37
69
Spider
46
30
55
59
15´
Lake
39
44
5011000m
42
57
39
Ni
Vicary
29
30
74
15
Three
44a
38
80
40
34
15
Mafic and Metasedimentary Rocks
57
75
Lake
Otter Lake
75
85
85
85
33
54
40
74
30
43
52
Creswicke Lake
76
45°15´00
40
Westphal
Cu,Au,Ag
30
80
39
10
57
41
47a
74
35
50
65
30
Lake
Cu,Ni
Seven Mile
16
77
80
85
16
26
62
25
Lake
25
25
45
48
44
30
25
7
th
ou
el
nn
ha
C
Island
27
41
Good Cheer
50
65
31
34
29
35
14
S
35
PROVINCIAL
PARK
18
Intermediate to Felsic Rocks
35
64
62
75
42
27
23
60
60
Blue
40
30
Cu
40
34
COWPER TP
Otter Lake
9
17
33
Canoe Lake
Horseshoe
Falding
40
THE MASSASAUGA
33
37
McLaren
39
52
43
72
88
65
49
49
30
20
20
Armer Bay
33
34
62
49
McCoy Lake
38
44
24
Five
67
47a
27
20
23
Cu
52
30
25
40
25
Islands
11
Cu
39
Grey, migmatitic layered gneiss
7
Wright
75
Unsubdivided pink and grey leucocratic gneiss
Honey Harbour Gneiss Association (units 15 to 18)
14
18
41
s Cre e k
40
84
60
68
60
82
39
39
Mile
22
37
45
17
Martyr
47a
n
86
31
45
Otter Lake
55
Lake
Cu
44
37
35
Island
45
46
40
5
20
Island
80
70
56
St an
33
50a
Hulett
50
31
17
50a
48
70
ha
C
Ha
in e
45
45
Holmur
50
39
Jack Lake
Dunroe
Bay
Island
80
34
57
th
34
55
Murdock
Long
Lake
46
Lioness
69
Dockmure
31
44
33
13
u
So
n
l
e
Intermediate to Felsic Rocks
PARAUTOCHTHON SOUTH OF PARRY SOUND DOMAIN
13
71
60
55
60
Fe,Ti,SM
Lake
49
75
45
30
Co,Cu,SM
53
22
57
54
Sandy
71
35
Underhill
57
57
Lipscombe
30
30
Quartzite
Nadeau Island Gneiss Association (units 9 to 14)
Lake
Lake
64
21e
Blackstone Lake Gneiss Association (units 42 and 43)
Lake
45
McDonald
Linger
19
Para-amphibolite
Kiosk
79°
Powassan
Restoule
Ag................................................................silver
Horseshoe
Back Lake
30
Cu
10
29
70
44
70
65
69
46b
40
40
84
Bennett Lake
Lake
24
49
21d
ALLOCHTHON-PARAUTOCHTHON BOUNDARY
Grey, migmatitic tonalite to granodiorite orthogneiss
Brennan
400
65
84
72
Sanagan
25
Isabella
FOLEY TP
78
51
46
40
82
r
68
27
47a
zU 1377 ± 14
78
47a
e
Island
zU 1160
60
43
zU 1382 ± 30
C
n
45
Virtue Lake
Lake
Cu
65
25
e
iv
Fe,Ti
7
34
78
50
70
45
65
ee
in
n
ha
70
34
82
84
23
43
Island
60
65
n
R
50a
l
80
80
35
37
72
n
y
e
85
33
80
Waubun o
25
32
45
70
55
35
81
57
o
B
15
St an
35
33a
60
65
66
33a
45
Island
15
79
m
o
Three Mile Lake
50
Nash
70
35
43
33a
65
75
50
33
55
45
45
Pink, sugary, layered leucocratic gneiss
quartzite
PARK
69
84
35
75
64
43
65
60
68
32
14
65
55
62
22a
55
19a
65
76
40
48
Lake
46a
44d
PROVINCIAL
50
63
55
St mb
44
15
St gb
55
80
30
Calc-silicate gneiss
80°
Noëlville
Head
(NADEAU ISLAND GNEISS ASSOCIATION):
Felsic to Intermediate, Layered or Migmatitic Rocks
Lake
OASTLER
Rintoul
48
Victoria Island
34
R iver
LAKE
Point
2
33
60
Bo y ne
61
48
Rose
St an,
30
50
70
45
33a
el
40
16
32
70
89
r
Yarrow
33
27
15
iv
e
19
40
47a
35
66
70
85
18
70
65
ann
14
bA 1126 ± 2
30
54
22
80
58
Ch
12
81
70
mA 909 ± 3
31
FIRST NATION I.R.
Al
Island
33b
58
19a
33a
84
70
50
Parry Island
Palestine
63
62
33a
70
22a
33
PARRY ISLAND
Parry Island
49
78
37
Island
gt,mica
84
47a
47
50
31
68
31
50
40
82
10
75
57
47
Bateau
32
69
80
68
62
85
Oastler Lake
83
71
35
17
57
63
zU <1385 ± 4
80
75
19a
76
70
45
59
71
71
80
Depot Harbour
Lake
37
29
31
83
33a
39
Depot Island
45
46
5020000m
Cu
trend only, teeth on
subhorizontal)
TECTONIC CONTACT WITH SUBJACENT BRITT DOMAIN
16
Lake
Cochrane
66
28
17
Pink to grey marble
21c
Small outcrops of unit 47a or 47b hosted by adjacent
Flaxman
Cu,fel
Cu,Au
34
75
45
39
Medium to dark grey, biotite-rich quartz-plagioclase
21b
19c
Moon River Gneiss Association (units 44 to 46)
20´
St mb
65
67
Lake
Lake
McNutt
thrust, interpreted;
(trend only, inclined)
varied amounts of pink leucosome
Moon River Subdomain (units 42 to 46)
21
Liebeck
Lake
Lake
400
35
88
35
70
67
74
Haines
30
78
35
21a
19b
17
Cu,Ag,
mb
80
Metasedimentary Rocks
LATE PALEOPROTEROZOIC
22
South Parry
85
46
68
48
41
31
21
31
mica
Sound
75
Weakly foliated to gneissic, mafic intrusive complex
INTRUSIVE CONTACT
Lake
gt
51
50
Dark grey dioritic orthogneiss, possible hypabyssal
Alban
Rosseau
leucosome
ALLOCHTHON
Lake
82
39
75
47b
McGowan
60
85
37
47
Depot
43
40
Lake
Island
mb,fel,
31
31
33a
Pell
79
46
35
9
mA 891 ± 8
Harbour
28
23
25
44
45
50
31
62
el
se Island Cha nn
Ro
49
43
25
31
39
37
83
66
Parry Island
Bay
Spectacle Lake
Richmond
Parry
Hay
70
19
EARLY MESOPROTEROZOIC to
Capton
Harbour
50
58
36
40
67
20
34
28
37
40
29
54
Anorthosite, gabbroic anorthosite, minor gabbro
Mohan Lake
Zn,Au,gt
45
21e
55
68
46
22b
tectonostratigraphic boundaries) (indicated by triangles)
Lovell
55
mb
30
35
47a
Lake
20
34
34
50a
Small outcrops of unit 48a or 48b hosted by adjacent
country rock units (commonly found along
55
30
31
36
22
33a
31
79
Islands
28
41
41
Nias
24
41
Rose
40
Reid Islands
34
37
43
48c
47c
Lake
24
75
31
41
70
45
60
33
20
Lake
27
25
Island
45
31
48
24
23
40
11
30
47
43
20
33
24
67
Island
41
54
48
6
19
23
Lane
36b
35
35
24
29
Islands
50a
Weakly foliated to gneissic metagabbro, primary
Hornblende diorite, gabbro
St gn
St mb
35
10
21
23
46
54b
23
Long
39
g
35
25
Grey tonalitic orthogneiss
Lower Go Home Domain (units 15 to 18)
40
40
37
30
30
Sister
65
19a
12
18
Shoal
48
24
21a
29
McLean
28
52a
24
60
9
60
Sound
25
15
5
24
48
40
Spruce
10
10
56
15
Island
9
16
15
29
Island
14
50b
19
13
Pancakes
15
21
Davy Island
20
19
19a
26
20´
10
Parry
26
31
26
13
S Channel
10
21b
8
65
The
P arry Sound
10
41
23
19
12
10
14
78
9
15
29
e
15
19
5
3
S
44
38
50
15
14
10
30
60
Lake
Faris
36
22a
Ojibway Gneiss Association (units 19 and 20)
consisting of gabbro, anorthosite and ultramafic rocks
Lake
21
19a
22
Unit 50a, with associated pink granite and grey
48b
Haines
5
35
15
Weakly foliated to gneissic, grey hornblende-biotite
Mafic Intrusive Rocks, Anorthosite Suite
39
Cu
25
30
12
11
23
47a
40
M
e
is
4
25
Intermediate Rocks
horizons
Martin Lake
Lake
St gn
15
16
St. Aubyn Bay
20
St gr
5
Development Agreement (COMDA), a
subsidiary agreement to the Economic and Regional Development
P.3550
hanging-wall side
Pink, migmatitic, sugary leucocratic gneiss and subordinate
paragneiss and schist ("Dillon schist") with quartzite
country rock units (indicated by dots)
47
15
North
10
w
21c
50
zU 1114 ± 2
24
Lake
Neville
20
30
23
18
Heaslip
16
16
Lake
St gn
Nb,U
22
21
igneous texture commonly preserved
Carruthers
Mill Lake
clay
5
45
21a
16
e
K
18
Island
11
6
20
zU 1159 ± 5
St gn
PARK
Bay
31
Unit 51a, with associated granite and monzonite
Intermediate Intrusive Rocks
48a
52a
20
hanging-wall side
Lineation (with plunge,
Felsic Rocks
intrusion (circa 1450 Ma)
Mafic Intrusive Rocks
48
Standing
Lake
20
15
16
19a
47a
Lake
13
29
20
PROVINCIAL
23
35
Darlington's
U
30
24
23
KILLBEAR
Park
mA 889 ± 3
McLean Lake
35
Wall
35
9
Killbear
21d
13
22
28
Home Lake
trend only, teeth on
Foliation
35
Grey, layered quartzofeldspathic gneiss containing
Weakly foliated to gneissic, pink monzonite, minor
granodiorite and monzodiorite
25
40
Thrust fault, interpreted;
Allochthon boundary
Intermediate to Felsic Rocks
grey, migmatitic leucogneiss
Weakly foliated to gneissic, grey tonalite with associated
30
50a
48a
Ouimet Point
13
U,Nb
53
25
15
73
57
17
16
49
CHRISTIE TP
Lake
5
14
22
12
23
8
50
32
21a
Lake
10
40
St gr
20
23
granodiorite
Dell
25
the five-year Canada Ontario 1985 Mineral
Pointe au
unknown generation
Grey, migmatitic tonalitic and granodioritic orthogneiss
hornblende, biotite, epidote
minor tonalite
50b
35
St gn
24
granodiorite, locally potassium feldspar megacrystic,
26
36
45
Bay Geological Synthesis, funded as part of
P.3549
foliation;
Intermediate to Felsic Rocks
Dainty
69
St gn
mapping program, Project C.2.3, Georgian
Killarney
trend only
parallel tectonic
Felsic Rocks
Intermediate to Felsic Intrusive Rocks
50a
Frey
12
25
Mapping was conducted as part of a three-year
46°
Fault, interpreted;
layering and/or
35
Felsic to Intermediate Intrusive Rocks
47a
34
10
12
12
15
Mowat Island
25
23
26
21
St gn
6
35
12
9
15
12
49
26
Island
23
4
20
4
Unit 52a, strongly foliated to protomylonitic
Lake
McGruther Lake
45
30
Bay
25
10
16
Compositional
ALLOCHTHON-PARAUTOCHTHON BOUNDARY
syenite
50
zU 1350 ± 50
Bowers
37
52c
51a
20
50a
St gn
21e
15
20
47
36
7
16
Unit 52a, with associated granite and quartz monzonite,
27
39
U
12
18
22b
20
14
25
Pink, leucocratic granite, locally potassium feldspar
52b
51b
20
21a
Geological Survey.
Harbour
Layered to podiform calc-silicate gneiss
25
28
23
15
24
18
70
21d
Gilboe Lake
Lake
Lake
20
17
15
37
19
124
wR 1330 ± 44
21
Avis
51
20
25
24
78
19b
21a
ay
50
St gn
53
58
Horse Island
24
a
y
30
75
53
5
30
24
13
C
32
21d
17
46
12
wR 1145
15
13
23
40
60
60
70
Harbour
15
Island
39
66
60
70
19a
35
40
67
18
Bay
13
8
30
20
SYMBOLS
Metasedimentary Rocks
TECTONIC CONTACT WITH SUBJACENT LOWER GO HOME DOMAIN:
Santa Lake
Cramadog
35
40
Island
23
Loon
32
45
21a
21
25
megacrystic
28
Martini Lake
20
47a
This map is published with the permission of the Director, Ontario
Trout Creek
Pink, sugary leucocratic granite gneiss
Felsic Intrusive Rocks
52a
er
Riv
10
45
25
Elizabeth
25
30
8
zU 1346 ± 69
54
15
50
14
60
23
20
54a
Island
75
37
75
15
NATURE
20
25
52a
50
23
21
12
23
8
80
29
Island
26
commonly potassium feldspar megacrystic
mA 884 ± 10
Island
32
20
70
52
PROVINCIAL
46
30
11
7
70
50
19
29
33
38
Grave
13
40
Huckleberry Island
19
31
70
9
1
47
22a
27
Lake
Corners
31
20
Mafic orthogneiss, amphibolite
COMMONLY CONTAINING GARNET
52
2 km
NTS Reference: 41 H/7 & 41 H/8, 31 E/5
French River
Mafic Intrusive Rocks, Coronitic Metagabbro Suite
DEFORMED AND MIGMATITIC ORTHOGNEISS,
Seq uin
20
20
21
15
28
vertical)
(circa 1165 Ma)
1
69
Mafic Rocks
"SINGLE CYCLE PLUTONIC ROCKS", VARIABLY
29
Basin
22
Goat
29
McDOUGALL TP
47a
Portage Lake
Mountain
12
16
24
20
10
30
7
32
25
38
21d
79
32
60
23
25
52b
Mink
5
Lily
54a
ISLANDS
25
28
Island
62
79
10
16
23
South
15
19b
15
40
22
40
41
21a
20
54
n
Green
25
27
Franklin
70
20
St gn
0
Agreement (ERDA) signed by the governments of Canada and Ontario.
Grey, migmatitic tonalitic and granodioritic orthogneiss
Sand Bay Gneiss Association (units 21 to 24)
Badger's
14
16
15
13
12
46
correspond to a suite or a complex.
Grey, heterogeneous, leucosome-rich (>25%),
INTRUSIVE CONTACT
Isabella
mA 903 ± 3
23
35
16
32
a
h
C
9
23
65
7
Bay
40
73
24
9
29a
29b
Lake
St gn
67
24
36
30
20
If it were decided to
1983 North American Stratigraphic Code, in most cases, they would
(trend only, inclined,
Pepper
Lake
35
Carling
metamorphism or intrusion of mafic dikes.
Intermediate to Felsic Rocks
coarse-grained, locally ophitic textured, metagabbro
Carling
25
23
60
65
U
10
gneiss association is an informal stratigraphic term, introduced by
Culshaw et al. (1988), that is primarily based on rock type, but which
formally name a "gneiss association" as a lithodemic unit under the
Dark green to black, weakly foliated to gneissic, medium- to
Lake
35
ek
Thus, not all
map units in the legend may appear on the map face.
A
Shawanaga Domain (units 19 to 24)
80
37
20
40
25´
Funston
U
36
21a
65
30
Greer
20
54
35
18
53
5030000m
19b
40
15
Cr
e
Maps P.3548, P.3549, P.3550, P.3551 and P.3552.
and slivers
Lake
Nobel
35
15
37
21a
45
30
10
laboratory investigations, including petrography and geochemistry.
This is a legend common to Ontario Geological Survey Preliminary
also may contain information with respect to plutonic history,
Lake
23
tU 1058 ± 2
1000 m
©
Unit 54a, with associated anorthosite and gabbro pods
19b
46
30
Lake
55
10
70
L ake
52a
6
40
Grey biotite-muscovite-garnet-kyanite gneiss and schist
Weakly foliated to gneissic mafic rocks of unknown
facies metamorphism and variably retrogressed
21e
Blair
35
32
55
es
Straight and mylonitic gneiss derived from units 1a
This legend is a field legend that locally incorporates the results of
Pere Brebeuf Gneiss Association (units 25 and 26)
protolith and of varied age, subjected to eclogite
Lake
Bell
10
28
52
60
20
17
56
5
5
21d
35
ng
36
28
30
50
75
60
54a
Ardagh
21a
h
5
32
23
m
19b
18
39
54a
54b
36
40
Cole Lake
16
20
16
23
mA 899 ± 6
20
15
21a
21a
10
37
S
26
28
11
Island
70
ko
e
sh
e
b
19
36
Raper
2
40
30
40
21a
80
9
50
45
im
23
10
15
21d
8
e
22
35
5
52b
12
75
28
35
23
30
8
10
30
23
S
a
c
Mafic Rocks
31
Blackwater
15
18
80
30
10
76
76
39
55
52b
84
60
20
18
4
15
5
36
39
56
4
55
66
18
47
18
53
80
4
7
35
38
25
R
30
5
60
60
60
56
63
9
52
67
5
6
57
g
Trout
47a
Shebeshekong
32
60
21a
75
40
36
19b
Island
70
42
85
23
19b
30
30
21b
44
70
Edgar
14
hA 969 ± 5
38
43
RESERVE
29
bA 943 ± 5
40
Island
41
55
70
Elmtree
34
11
14
10
10
Metasedimentary Rocks
35
54
5
10
20
20
7
34
37
45
15
21a
45
20
41
55
ko
n
r
e
5030000m
30
45
54
70
60
28
85
39
38
55
60
19b
15
HIGH-GRADE METAMORPHISM
WITHIN THE GRENVILLE PROVINCE
Lake
15
No
Unit 1a, with minor amounts of unsubdivided polycyclic
and/or 1b
LOCATED WITHIN THE PARRY SOUND SHEAR ZONE
29
MESOPROTEROZOIC
32
tr
35
19b
1c
b
Boy
45
15
25
le Shebe s
he
Litt
21d
S
11
1b
migmatitic granodioritic gneiss
Hurdville
20
15
559
40
10
iv
18
Dillon
25
23
70
20
15
20
35
21e
2
4
PARRY SOUND AREA
81°
40
21
17
30
INTRUSIVE CONTACT
35
5
37
72
10
28
35
35
45
55
1
Adanac
21a
25
13
23
30
33
61
15
58
23
55
20
85
75
80
53
30
Shebeshekong
12
Landing
21b
43
5
Brooks
23
72
17
ek
re
14
42
31
21a
72
45
65
7
62
6
53
52b
Lake
MAP P.3550
Queen's Printer for Ontario, 2004.
Brown weathering, fine- to medium-grained diabase
47a
C
14
19b
16
52
leucosome older than the dikes is observed
Gneiss Association (unit 30)
40
45
43
metamorphosed mafic dikes (amphibolite).
pelitic and garnet-rich gneiss interlayered with
bA 926 ± 4
30
Para-amphibolite and unsubdivided paragneiss; includes
Gneissic Rocks Structurally Below the Lighthouse
(590 Ma)
Lake
mA 897 ± 4
ir
53
Cu
43
70
Mostly medium-grained, moderately foliated to gneissic,
migmatitic, granodiorite to tonalite containing
Mafic Intrusive Rocks (Grenville diabase dike swarm)
55
33
1a
Mafic and Metasedimentary Rocks
Pine Island Gneiss Association (units 27 to 29)
Johnston
Intermediate Migmatitic Rocks
1
and metasedimentary gneiss
PRECAMBRIAN
39
5
30
20
75
35
15
peat
CARLING TP
Sand Bay
83
24
30
27
13
Amphibolite
grey to white sublithographic to lithographic limestone)
Ontario Geological Survey
Scale 1:50 000
Mafic Rocks
quartzofeldspathic gneiss and minor quartzite
Broadbent
23
20
Quartzite, minor associated paragneiss
NEOPROTEROZOIC
la
20
6
19
21a
11
40
19
sillimanite gneiss; minor quartzite, calc-silicate gneiss
Unsubdivided: includes Gull River Formation (light brown-
34
Waubamik
12
15
36
locally with garnet-hornblende and garnet-kyanite and
grey to blue-grey interbedded limestone and dolostone,
:
PRECAMBRIAN GEOLOGY
granodiorite orthogneiss
Upper Go Home Domain (units 25 to 29)
23
19b
Mafic monzodiorite gneiss
Layered, pink to grey quartz-feldspar-biotite paragneiss,
TECTONIC CONTACT (SUSPECT) WITH THE SHAWANAGA DOMAIN,
Mile
Spectacle Lake
15
30
14
14
10
Nine
23
19b
20
31
Chemical Sedimentary Rocks
31
Lake
27
Mafic gneiss; minor metagabbro, anorthositic gneiss
3b
Layered, migmatitic, grey tonalite, minor trondhjemite,
and Shadow Lake Formation (calcareous red and green
Lake
20
20
er
32
McKELLAR TP
Lake
50
35
25
29
45
56
65
B
35
32
85
iv
MIDDLE ORDOVICIAN
Campbell
Cranberry
31
19b
16
75
52a
20
30
17
R
g
30
20
30
33a
UNCONFORMITY
35
30
10
25
25
61
Johns
mica
Lake
Dinner Lake
64
14
16
g
30
55
5
54
51
e
sh
n
9
19b
2
Sh
eb
40
o
k
Island
16
23
40
33
70
19b
69
tU 1045
25
e
Dart
peat
62
60
70
12
55
73
70
20
40
15
47a
30
peat
22
38
40
47a
70
37
10
10
25
42
50b
12
60
11
14
55
18
11
in
b
a
arkosic sandstone, pebbly sandstone, siltstone and shale)
30
12
55
7
85
35
35
35
19b
11
3a
Metasedimentary Rocks
2
Intermediate to Felsic Rocks with Metadiabase Dikes
ORDOVICIAN
36
r
36
50
13
9
4
80
10
40
80
52b
20
40
43
55
36
50
14
35
16
23
50
50
8
25
85
4
14
Island
14
75
82
Sisters
33
80
60
66
18
72
4
Fe
w
u
e
iv
R
35
tU 1026
6
3
3
Quartzite, minor associated paragneiss and para-amphibolite
Bustard Islands Gneiss Association (unit 1)
PALEOZOIC
Tongue Lake
23
19b
58
itouwabing L ake
peat,St gr
35
17
34
Lake
65
19b
30
70
75
80
20
64
52b
60
35
36
Ma n
Lake
39
69
19b
Mafic Rocks
33b
Harris
U
21e
St gn
85
75
15
33
52a
mica
3
12
10
mA 888 ± 8
40
34
32
Mazur
55
25
65
80
35
34
40
18
Lockett
Ri
ve
r
13
62
64
64
82
7
10
23
65 Lake
70
9
10
8
Lake
22
35
St gn
15
5
g
36
10
76
19b
82
82
19
Imrie
12
46
20
30
21a
6
2
11
52b
41
35
60
30
72
14
74
87
20
20
on
clay
68
45
60
10
75
50a
Big
23
30
10
30
19
McCoy
26
25
68
43
20
35
45
3
4
30
36
27
Island
5
5
76
6
7
11
35
Little
62
75
70
11
65
25
10
30
65
50
52b
50b
53
11
80
50
6
40
73
25
12
10
32
5
65
e
Mafic and Metasedimentary Rocks
UNCONFORMITY
mA 894 ± 3
FERGUSON TP
20
Sh
eb
Predominantly grey gneiss with pink granitic leucosome
Lake
25
25
50
50
22
12
60
40
20
56
63
45
60
19
75
15
and till
37
20
19b
75
50
ak
e
6
1
tU 967
45
50
21
L
22
57
77
19b
tU 956
45
6
30
ek
on
g
55
18
80
33
2
30
Pink, sugary leucocratic gneiss
4c
Glacial deposits; sand and gravel, clay
57
Crow
24
Woods
45
45
31
ek
35
h
30
46
45
k
34
S
9
75
10
34
10
10
21a
23
27
15
50b
70
St an
Lake
15
5
35
30
35
45
35
28
19b
24
e
sh
14
21d
23
zU 1121 ± 12
19b
23
22
Redfern
5
78
L
it
tl
e
50
24
zU 1095
Island
3
27
70
63
80
50
16
4b
Lighthouse Gneiss Association (units 31 to 33)
Lake
e
Blai r Cr
Hertzberg
36
30
zU 1091 ± 11
67
40
50b
38
18
Lake
35
25
54
26
38
22
30
55
15
65
SHAWANAGA TP
20
5
83
zU 1001 ± 4
11
80
12
25
23
8
20
9
8
15
45
45
78
52b
40
19b
8
41
70
66
76
20
40
45
70
8
Shawanaga
9
5
70
49
Unsubdivided pink and grey leucocratic gneiss
quartzite
PLEISTOCENE
Killeen Lake
Mile
R
75
53
Nine
25
it
o
zU 1042 ± 4
23
53
52b
25
Lake, stream and swamp deposits
e
38
Marsh
4a
Para-amphibolite, layered mafic gneiss, paragneiss and
on
2
50
80
70
60
23
13
4
22
Intermediate to Felsic Rocks
4
Mafic Rocks
RECENT
38
47a
52a
12
12
35
15
n
zU 988 ± 2
85
55
4
St an
50
23
27
23
ck
st
30
27
20
5
50b
30
40
50
QUATERNARY
35
80
35
M
a
5
25
30
30
40
5
52
30
19b
6
B la
t
3
21
Lake
r
le
In
14
75
52b
11
54a
4
25
85
peat
Madigans
Multicomponent layered gneiss and migmatite, minor
Armer Bay Gneiss Association (units 34 and 35)
Vowel
47a
Ri
ve
zU 1019 ± 4
46
20
eric
50a
42
41
50b
35
Intermediate to Mafic Migmatitic Rocks
5
Parry Sound Domain (basal) (units 30 to 35)
CENOZOIC
19b
g
50a
Fr
ed
14
70
80
Key Harbour Gneiss Association (units 2 to 5)
LOCATED WITHIN PARRY SOUND SHEAR ZONE
amphibolite
21e
14
Lake
51
55
4
65
8
52b
37
23
30
25
Rainy
50a
51
THRUST CONTACT WITH PARRY SOUND DOMAIN (BASAL),
5039000m
ito
uw
ab
in
54b
3
12
45
50a
50b
28
16
11
67
66
65
64
63
62
61
PHANEROZOIC
Ma
n
11
5038000m
23
65
19b
9
11
35
Grouse Lake
560000m
59
58
57
45°30´00
La
ke
27
53
35
Island
78
56
55
e
17
21a
Shawanaga
54
53
52
de
26
5
11
16
51
550000m
abc
593000m
92
91
590000m
89
88
87
86
85
84
a
th
40
49
48
47
46
er
45°30´00
45
44
43
83
82
81
580000m
79
78
iv
42
41
77
76
75
74
R
540000m
39
38
72
71
570000m
69
68
73
u
in
37
36
535000m
20´
25´
30´
80°33´38
15´
55´
80°00´00
05´
10´
LEGEND
79°47´48
50´
92
593000m
94
79°47´48
It is
recommended that reference to this map be made in the following
form:
Culshaw, N.G., Corrigan, D., Ketchum, J.W.F., Wallace, P. and
Wodicka, N. 2004. Precambrian geology, Parry Sound area; Ontario
Geological Survey, Preliminary Map P.3550, scale 1:50 000.
5
56
50a
1
72
5
34
1
50a
25
31
4a
47
64
26
5
60
15
76
5
50a
20
17
58
26
57
33
50b
5
4a
84
81
62
Gi
x
rou
R
e
iv
r
5
70
57
20
72
62
Rocks
50b
55
58
50a
27
61
48
25
48
82
86
5060000m
40
77
39
80
1
44
70
55
Island
42
65
4b
4b
60
80
79
33
80
50b
47
85
76
80
76
58
Head
Island
51
70
60
25
42
Olwyn
40
45
7b
37
40
4a
35
8
85
St gn
20
50
40
84
25
32
50a
28
7a
80
40
60
80
7b
45
10
55
N ai
iv
ot R
sco
er
M
h
a
n
n
48
64 8
70
64
50
78
7a
75
ar
Ch
70
78
7b
80
Burnt
70
60
40
62
61
60
61
8
10
80
60
8
25
48a
18
7b
70
7a
60
35
4
1
8
11
529A
20
8
30
Lake
66
60
67
74
Inlet
67
37
47
7b
30
43
7a
56
27
30
60
20
51
37
33
47
30
7a
30
33
38
58
25
34
32
16 14
8
23
6b
20
25
8
10
45
45
14
15
22
34
31
70
37
7b
60
8
tU 1430 ± 17
20
70
20
52b
60
20
8
40
52b
20
25
75
24
15
30
zU 1448 ± 1
85
50
12
69
70
52b
85
70
7b
23
14
55
Pointe au Baril
85
52b
Lookout
10
7b
85
20
25
46
40
52b
50
10
49
13
5
14
45
5
40
5
7b
52b
60
35
37
15
25
Middle
31
Ojibway
Island
5
22
55
35
80
80
Oberlin Bay
80
65
80
75
41
Bill
80
30
14
18
30
8
9
19b
40
75
40
52b
60
11
39
10
35
45
15
11
45°30´00
40´
27
28
29
530000m
31
32
35´
33
34
35
36
37
38
39
30´
540000m
12
3
41
42
43
44
20
44
75
51
35
20
34
70
70
4
82
68
75
13
9
80
55
50b
46
25´
38
Lake
4
(with plunge)
occurrences
22b
Dark grey dioritic orthogneiss, possible hypabyssal
9
ROUND LAKE
6
82
50a
50b
47
gU 1450 ± 1
41
PROVINCIAL
Mineral Deposit
(interpreted)
Inventory (MDI))
Medium to dark grey, biotite-rich quartz-plagioclase
Limit of mapping;
Location of isotopic
paragneiss and schist ("Dillon schist") with quartzite
denotes limits of area
horizons
mapped during this
21b
Pink to grey marble
survey
21c
Calc-silicate gneiss
21d
Para-amphibolite
21e
Quartzite
Metasedimentary Rocks
21a
19b
51
52
20´
11
Orrville
35
Dorset
Port Sydney
141
BAY
Tobermory
Dwight
60
Huntsville
Parry Sound
117
Sans
Souci
Dyer's Bay
Baysville
MacTier
6
P.3551
118
400
Bala
Lion's
118
Bracebridge
169
45°
Edenhurst
Honey
Harbour
Purple
Valley
LAKE
Penetanguishene
Gravenhurst
P.3552
Red Bay
Norland
Washago
12
Wiarton
HURON
Nottawasaga
81°
Bay
Leith
Midland
11
80°
169
79°
Orillia
12
48
Brechin
26
Location Map
1 cm equals 25 km
SOURCES OF INFORMATION
Thematic information on this map is tied to a digital base map derived
from maps 41 H/9 and 10 of the National Topographic System, scale
1:50 000. Universal Transverse Mercator (UTM) co-ordinates are in
North American Datum 1983 (NAD83), Zone 17.
Geological Survey of Canada Ontario Department of Mines 1965.
Aeromagnetics, Pointe-au-Baril; Geological Survey of Canada Ontario
Department of Mines, Geophysical Map 1497G, scale 1:63 360.
Geological Survey of Canada Ontario Department of Mines 1965.
Aeromagnetics, Naiscoot River; Geological Survey of Canada Ontario
(MDI2)
Migmatitic Rocks
gf ............................................................graphite
19a
St gn ..............................................stone, gneiss
Grey metatextite with pink, hornblende-epidote-bearing
Grey, migmatitic, tonalitic to granodioritic gneiss with
Grey hornblende-epidote-biotite tonalitic orthogneiss
Felsic Rocks
Mineral Deposit Inventory Version 2
October 2002 Release; Ontario Geological Survey, Digital Data.
Culshaw, N.G., Corrigan, D., Drage, J. and Wallace, P. 1988. Georgian
Bay geological synthesis: Key Harbour to Dillon, Grenville Province of
Ontario; in Current Research, Part C, Geological Survey of Canada,
Paper 88-1C, p.129-133.
Culshaw, N., Reynolds, P.H. and Check, G. 1991. A
40
39
Ar/
Ar study of
post-tectonic cooling in the Britt domain of the Grenville Province,
bA = biotite Ar/Ar date, in Ma
Ontario; Earth and Planetary Science Letters, v.105, p.405-415.
hA = hornblende Ar/Ar date, in Ma
mA = muscovite Ar/Ar date, in Ma
Heaman, L.M. and LeCheminant, A.N. 1993. Paragenesis and U-Pb
wR = whole rock Rb/Sr date, in Ma
systematics of baddeleyite (ZrO2); Chemical Geology, v.110, p.95-126.
aU = allanite U/Pb date, in Ma
dU = baddeleyite U/Pb date, in Ma
Ketchum, J.W.F., Heaman, L.M., Krogh, T.E., Culshaw, N.G. and
gU = garnet U/Pb date, in Ma
Jamieson, R.A. 1998. Timing and thermal influence of late orogenic
nU = monazite U/Pb date, in Ma
extension in the lower crust: a U-Pb geochronological study from the
tU = titanite U/Pb date, in Ma
southwest Grenville orogen, Canada; Precambrian Research, v.89,
zU = zircon U/Pb date, in Ma
p.25-45.
50
50a
Pink to grey leucocratic gneiss
18b
Pink to grey, migmatitic leucogranite to granodiorite
53
55
55
CARLING TP
Rainy
17a
Unclassified granitoid orthogneiss
17b
Monzonitic to granitic orthogneiss
56
Krogh, T.E. and Davis, G.L. 1970. Metamorphism 1700±100 m.y. and
900±100 m.y. ago in the northwest part of the Grenville Province in
Mafic Rocks
Mafic orthogneiss
Krogh, T.E. and Davis, G.L. 1970. Isotopic ages along the Grenville
Metasedimentary Rocks
15a
p.309-313.
Unclassified paragneiss
15b
Marble; may be associated with rusty graphitic schist
15c
Calc-silicate gneiss
Krogh, T.E. and Davis, G.L. 1971. Paragneiss studies in the Georgian
Bay area 90 km southeast of the Grenville Front; Carnegie Institution of
Reynolds, P.H., Culshaw, N.G., Jamieson, R.A., Grant, S.L. and
McKenzie, K. 1995.
40
39
Ar/
Ar traverse - Grenville Front Tectonic Zone
to Britt Domain, Grenville Province, Ontario, Canada; Journal of
Britt Domain (units 1 to 14)
Metamorphic Geology, v.13, p.209-221.
Grey biotite leucogneiss of granodioritic composition
Tuccillo, M.E., Mezger, K., Essene, E.J. and van der Pluijm, B.A. 1992.
Thermobarometry, geochronology and the interpretation of P-T-t data
14
Migmatitic Rocks
in the Britt domain, Ontario Grenville orogen, Canada; Journal of
Grey, migmatitic, leucocratic hornblende-biotite orthogneiss
Petrology, v.33, p.1225-1259.
of granodioritic to monzodioritic composition
van Breemen, O., Davidson, A., Loveridge, W.D. and Sullivan, R.D.
Migmatitic Rocks
1986. U-Pb zircon geochronology of Grenvillian tectonites, granulites
Mafic Rocks
Grey, leucocratic, migmatitic hornblende-biotite-garnet
and igneous precursors, Parry Sound, Ontario; in The Grenville
Amphibolite
orthogneiss of tonalitic to granodioritic composition
Province, Geological Association of Canada, Special Paper 31, p.191-
12
Metasedimentary Rocks
12a
Unclassified paragneiss
12b
Orthopyroxene-bearing, calcareous paragneiss, mafic
12c
Mafic granulites
gneiss and para-amphibolite
Magnetic declination approximately 10°29'W in 2004.
d
57
39
19b
58
15´
59
45°30´00
560000m
61
62
563000m
Geology not tied to surveyed lines.
d
Felsic Rocks
Metric conversion factor:
11
1 foot = 0.3048 m.
Metasedimentary Rocks
CREDITS
Intermediate to Felsic Granulites
10
Metasedimentary Rocks
Rusty weathering, graphitic paragneiss
N. Wodicka, 1987 to 1990.
Intermediate to Felsic Granulites (layered)
Grey, migmatitic, leucocratic garnet-biotite paragneiss,
Unsubdivided, buff to grey weathering, layered, feldspathic
locally with sillimanite; pink leucosome, may contain garnet,
granulite
muscovite, magnetite
Intermediate to Felsic Granulites (retrogressed)
Bayfield Gneiss Association (units 6 to 8)
36b
Marble, calc-silicate tectonic breccia
Digital drafting by S. Josey.
Geology, legend and mineral deposit information reviewed by
8
Intermediate to Felsic Rocks
Pink, sugary leucocratic gneiss
Intermediate to Felsic Intrusive Rocks
7a
Unsubdivided grey and pink, variably layered, highly
strained orthogneiss, in places with recrystallized
potassium feldspar megacrysts
6
Metasedimentary Rocks
6a
Cartographic production by S. MacLean.
To enable the rapid dissemination of information, this map has not
received a technical edit.
Discrepancies may occur for which the
Ontario Ministry of Northern Development and Mines does not assume
liability.
Users should verify critical information.
Grey, leucocratic, migmatitic hornblende-biotite-garnet
orthogneiss of tonalitic to granodioritic composition
Metasedimentary Rocks
Layered paragneiss, garnet-rich granulite
Geological compilation by N.G. Culshaw, 1991 and 2004.
R.M. Easton.
Mafic Rocks
36a
Geology by N.G. Culshaw, D. Corrigan, J.W.F. Ketchum, P. Wallace and
Metasedimentary Rocks
Grey, leuco- to mesocratic garnet-biotite paragneiss,
commonly with sillimanite; locally graphitic and
Lake
50b
54
Krogh, T.E. and Davis, G.L. 1969. Geochronology of the Grenville
Intermediate to Felsic Rocks
19b
16
Krogh, T.E. 1994. 1.45 Ga granulites in the southwestern Grenville
Geology, v.22, p.215-218.
18a
7b
36
55
11
550000m
age determination
ABBREVIATIONS
PARAUTOCHTHON NORTH OF PARRY SOUND DOMAIN
5040000m
559
75
38
49
bA 978 ± 6
Unsubdivided pink and grey leucocratic gneiss
granulite or gneissic metagabbro
15
24
Nobel
P.3550
Ontario Geological Survey 2002.
Intermediate to Felsic Rocks
Unsubdivided, layered, predominantly mafic two-pyroxene
42
50b
GEORGIAN
Novar
Broadbent
BASE OF LOWER GO HOME DOMAIN NOT OBSERVED
7
37
27
80
McKellar
69
Kearney
Sprucedale
Department of Mines, Geophysical Map 1507G, scale 1:63 360.
(e.g., unit 39 or 40); pegmatite veins may be common
Shawanaga
43
Dunchurch
Front in Ontario; Carnegie Institution of Washington, Yearbook 68,
15
evidence of retrogression from a granulite facies precursor
18
50a
30
48
43b
NATURE RESERVE
45
40
80
Pink, sugary, layered leucocratic gneiss
(granodiorite, tonalite to diorite) orthogneiss containing
50a
53
54
(as classed by the
Geological contact
Unsubdivided, grey, foliated to gneissic, intermediate
15
19b
tU 966
45
Wiwassasegen
85
10
50b
4
Lake
73
23
39
42
Raven
82
70
SHAWANAGA TP
75
72
70
nU 1062 ± 2
Magnetawan
Burk's Falls
Ardbeg
Waubamik
Dillon
Pink, layered, leucocratic paragneiss
zU 1050
dU 1152 ± 2
10
nU 1053 ± 2
25
Ahmic
Harbour
Ontario; Carnegie Institution of Washington, Yearbook 68, p.308-309.
9
gU 1435 ± 2
50a
43a
65
10
85
12
Intermediate to Felsic Rocks
Unsubdivided, grey to buff weathering, orthopyroxene-
33
32
70
South River
Sundridge
Magnetawan
Quartzite
Buff to pink weathering, leucocratic granulite
40
25
14
70
23
14
23
85
10
60
75
64
19b
28
Port Loring
North
Province; Carnegie Institution of Washington, Yearbook 67, p.224-230.
43
80
80
9
gU 50a
1396 ± 6
75
41
Birch
50b
75
25
40
tU 1008
60
Island
30
10
44
55
65
50
20
41
32
52b
9
76
55
53
14
gf
60
20
65
discretionary
Grey tonalitic orthogneiss
Parry Sound Domain (interior) (units 36 to 41)
I.R. 17
45
14
30
Pakesley
Province: geologic setting, P-T conditions, and U-Pb geochronology;
18
61
9
62
21a
86
52b
9
SHAWANAGA
10
40
I.R. 17B
78
Interlayered amphibolite, semi-pelitic gneiss and
PARRY SOUND DOMAIN (INTERIOR)
55
84
54
Key
Commanda
Ketchum, J.W.F., Jamieson, R.A., Heaman, L.M., Culshaw, N.G. and
bearing intermediate (granodiorite, tonalite to diorite)
25
9
28
40
85
m-asymmetry
22a
orthogneiss
35
NAISCOUTAING
19b
40
25
38
44c
44
Lake
78
10
46°
Restoule
207.
80
40
14
33
30
33
Landing
Amphibolite
TECTONIC CONTACT WITH SUBJACENT
50a
80
9
Shawanaga
9
80
15
23
52b
45
15
85
50b
39
60
Shawanaga
64
tU 958
78
23
Intermediate Rocks
Honey Harbour Gneiss Association (units 15 to 18)
13
51
83
60
65
27
12
55
70
80
20
78
45
17
55
10
55
55
70
Island
60
Island
55
45
40
50a
20
70
85
14
50a
40
10
11
37
34
18
30
Carolyn
11
70
9
45
84
50
15
31
65
Shawana
ga River
Lake
42
12
80
70
9
85
40
14
32
hA 964 ± 5
31
Island
65
80
45
10
11
33
35
65
Nadeau
50
Islands
5040000m
65
76
10
Black
11
14
52b
31
50
Sasega
87
20
40
45
81
bA 948 ± 5
35
35
65
Skerryvore
51
Oak
Island
73
60
52b
mA 904 ± 3
55
34
14
52
20
80
55
52b
25
45
35
42
30
30
8
65
15
Mafic orthogneiss
44b
70
49
30
30
11
16
24
35
60
35
53
11
30
44a
Rock
11
24
70
75
32
75
prospects,
52
14
5
Black
Lake
25
60
19
10
50
5
65
40
30
20
22
50
12
10
tU 1028
52b
Mineral occurrences,
Fold axis; minor fold,
Nadeau Island Gneiss Association (units 9 to 14)
43
49
15
14
12
5
tU 1000
47
55
14
52b
85
26
45
50
12
Island
14
Channel
8
5
48
11
40
Grey, migmatitic layered gneiss
quartzite
77
25
30
20
12
Pollard
(with plunge)
Pink, sugary, layered leucocratic gneiss
gf
75
5
20
30
16
6
18
10
20
43
30
14
50
11
26
35
14
30
35
51
12
Island
Jergens
50
30
26
48
r
25
10
24
30
Island
35
36
20
Rathlyn
26
14
40
20
O'Brien Islands
47
53
26
in opposite directions
Pink, migmatitic, sugary leucocratic gneiss and subordinate
Blackstone Lake Gneiss Association (units 42 and 43)
66
57
40
3
25
44
14
Shawana g
a R
iv
e
20
40
Island
60
33
50
trend only, limbs dip
z-asymmetry
PARAUTOCHTHON SOUTH OF PARRY SOUND DOMAIN
EAST BURPEE TP
63
10
65
Synform, interpreted;
Fold axis; minor fold,
ALLOCHTHON-PARAUTOCHTHON BOUNDARY
Mafic and Metasedimentary Rocks
44d
25
5
Fossmill
Pickerel
Shallow
Felsic Rocks
(NADEAU ISLAND GNEISS ASSOCIATION):
Intermediate to Felsic Rocks
46
56
30
8
Pentecost
15
75
30
20
50
50
20
10
35
14
30
14
17
40
80
17
85
43
Shawanaga Inlet
48
34
60
48
30
35
49
26
36
47
4
48
25
29
30
15
Island
40
35
20
45
Burnt
35
55
78
10
14
5
14
55
38
33
16
4
30
45
40
44
49
12b
10
67
70
15
49
40
80
25
Island
50
36
3
65
70
Island
68
42
45
14
37
33
50
30
25
20
16
33
82
35
75
45
12cb
72
Tonches
75
40
Kiosk
79°
Powassan
Washington, Yearbook 69, p.339-341.
44
14
17
70
15
17
14
40
in opposite directions
unknown generation,
TECTONIC CONTACT WITH SUBJACENT BRITT DOMAIN
Granite
Lake
24
58
10
31
85
32
Fold axis; minor fold,
(with plunge)
varied amounts of pink leucosome
Grey, migmatitic tonalite to granodiorite orthogneiss
38
10
55
12
mA 896 ± 6
20
22
72
20
89
zU 1452 ± 2
70
tU 1024
36
45
50
Island
11
zU 1114
63
27
47
55
Barclay
40
20
46b
6
38
40
35
31
Lake
49
10
40
14
7b
18
tU 1005
57
44
30
trend only, limbs dip
Grey, layered quartzofeldspathic gneiss containing
19b
Felsic to Intermediate, Layered or Migmatitic Rocks
20
Tower
8
46
63
46
7b
65
49
20
65
27
75
60
75
25
5
7b
20
20
6a
50
40
22
70
46
46a
14
unknown generation,
s-asymmetry
Moon River Gneiss Association (units 44 to 46)
70
Lost
Antiform, interpreted;
subhorizontal)
leucosome
16
Lake
14
Lineation (with plunge,
Intermediate to Felsic Rocks
Small outcrops of unit 47a or 47b hosted by adjacent
48
Turtle
85
14
19
Moon River Subdomain (units 42 to 46)
10
8
51
hanging-wall side
fel............................................................feldspar
17
70
88
35
10
8
28
20
75
22
27
47
10
vertical)
35
tectonostratigraphic boundaries) (indicated by triangles)
35´
12
20
52b
trend only, teeth on
ALLOCHTHON
tU 1049
75
10
42
22
tU 1000
20
Weakly foliated to gneissic, mafic intrusive complex
INTRUSIVE CONTACT
tU 985
49
gf
20
60
Anorthosite, gabbroic anorthosite, minor gabbro
28
55
7b
80
80°
Noëlville
Rosseau
Ojibway Gneiss Association (units 19 and 20)
Small outcrops of unit 48a or 48b hosted by adjacent
49
Lake
20
20
30
45
40
45
thrust, interpreted;
(trend only, inclined,
Hornblende diorite, gabbro
tU 961
17
26
20
21
3
644
60
60
65
80
Weakly foliated to gneissic metagabbro, primary
Owl
30
75
55
8
Pointe au Baril
Station
9
trend only
unknown generation
LATE PALEOPROTEROZOIC
49
24
8
tU 1004
29
40
6a
24
16
L
g
layering and/or
Allochthon boundary
intrusion (circa 1450 Ma)
Lake
17
70
20
12
22
35´
tU 998 ± 15
n
Lo
56
80
18
8
80
68
16
11
7b
70
28
70
17
6
26
d
37
n
39
8
7a
22
EARLY MESOPROTEROZOIC to
Kibeong
Lake
85
Alban
Lower Go Home Domain (units 15 to 18)
63
34
22
5050000m
14
24
Fault, interpreted;
foliation;
35
Unit 50a, with associated pink granite and grey
country rock units (commonly found along
Sucker Lake
20
Compositional
Grey, migmatitic tonalitic and granodioritic orthogneiss
Weakly foliated to gneissic, grey hornblende-biotite
Argue
la
30
25
16
48
45
47c
Is
6a
11
Georgian Bay
7b
47b
Lake
55
Niweme
82
35
grey, migmatitic leucogneiss
consisting of gabbro, anorthosite and ultramafic rocks
49
25
7b
52
35
37
30
30
49
26
70
77
47a
55
16
11
69
81°
Baril Station
Mafic Intrusive Rocks, Anorthosite Suite
47
Spectacle
47
Bay
d
6a
2
25
45
11
50
23
6b
51
Lake
subsidiary agreement to the Economic and Regional Development
P.3549
parallel tectonic
19c
ek
Cre
40
50
30
20
r
ck e
Su
Lake
Brewery
13
40
53
30
26
33
35
25
14
Unit 51a, with associated granite and monzonite
Ontario 1985 Mineral
Development Agreement (COMDA), a
Inlet
Intermediate to Felsic Rocks
country rock units (indicated by dots)
23
25
77
4
8
18
5
85 52
30
48c
10
oo
19
50
45
7b
24
7a
23
igneous texture commonly preserved
48b
Island
80
32
Lake
Bird
70
Skunk
20
22
48
8
7b
SYMBOLS
35
Intermediate Intrusive Rocks
48a
r
fish Rive
Dog
7b
52
Bi g w
60 15
40
75
23
50
75
18
7b
84
60
6a
54
22
26
5050000m
6b
61
52
55
40
50
fel
8
Lake
10
19
41
25
18
78
36
60
25
the five-year Canada
P.3548 Britt
Felsic Rocks
Mafic Intrusive Rocks
48
52
57
7b
70
23
70
20
50
25
23
24
35
33
50
45
Wilson
Moose
57
Sturgeon
80
33
70
8
30
20
50
10
33
42
6a
53
7b
12
20
62
9
20
Bay Geological Synthesis, funded as part of
Harbour
Weakly foliated to gneissic, grey tonalite with associated
18
mapping program, Project C.2.3, Georgian
Killarney
Layered to podiform calc-silicate gneiss
Weakly foliated to gneissic, pink monzonite, minor
granodiorite and monzodiorite
78
27
65
15
Island
70
22
65
35
7a
60
51
80
49
70
6a
25
30
33
65
9
34
63
26
Gibraltar
30
42
23
8
6b
75
39
15
65
10
67
43
8
Harbour
5
30
27
24
72
67
Mapping was conducted as part of a three-year
Trout Creek
35
granodiorite
8
Bayfield
17
53
Lake
HARRISON TP
7b
3
58
29
52
Bayfield
Inlet
40
50b
Oxbow
PROVINCIAL PARK
Geological Survey.
French River
Metasedimentary Rocks
Intermediate to Felsic Intrusive Rocks
50a
STURGEON BAY
7b
Cranberry
Adjacent rocks may have been
Mafic orthogneiss, amphibolite
Shawanaga Domain (units 19 to 24)
minor tonalite
35
65
26
Georgian
20
24
50
12
40
53
This map is published with the permission of the Director, Ontario
Head
Felsic to Intermediate Intrusive Rocks
54
57
7b
42
Unit 52a, strongly foliated to protomylonitic
51b
Little Wilson
e
6a
10
metamorphism at circa 1450 Ma.
wholly overprinted by Grenvillian upper amphibolite facies metamorphism.
syenite
Lak
NTS Reference: 41 H/9, 10
Agreement (ERDA) signed by the governments of Canada and Ontario.
These rocks locally preserve evidence for granulite facies
ALLOCHTHON-PARAUTOCHTHON BOUNDARY
granodiorite, locally potassium feldspar megacrystic,
52
10
23
ile
Lake
32
52c
41
70
35
86
522000m
M
7b
16
Unit 52a, with associated granite and quartz monzonite,
51a
Si
x
65
10
57
55
Island
80°43´44
Lake
32
50
Mafic Rocks
commonly potassium feldspar megacrystic
Mile
Six
Pink, leucocratic granite, locally potassium feldspar
52b
55
51
7b
Meneilly
53
13
Manbert
25
48a
Passag
e
7a
Miskokway
Horseshoe
8
7b
Ale xand
er
65
7b
55
d
TECTONIC CONTACT WITH SUBJACENT LOWER GO HOME DOMAIN:
megacrystic
Evans Lake
48a
85
73
75
Grey, migmatitic tonalitic and granodioritic orthogneiss
Felsic Intrusive Rocks
52a
85
8
85
52
64
80
7a
73
45
42
40
60
Island
correspond to a suite or a complex.
hornblende, biotite, epidote
85
7a
22
ann el
Ch
35
54
46
33
7b
If it were decided to
1983 North American Stratigraphic Code, in most cases, they would
Grey, heterogeneous, leucosome-rich (>25%),
Pink, sugary leucocratic granite gneiss
COMMONLY CONTAINING GARNET
56
Lake
65
Big
t
DEFORMED AND MIGMATITIC ORTHOGNEISS,
Lake
6a
th
80
In le
les
fel
35
80
metamorphism or intrusion of mafic dikes.
29a
"SINGLE CYCLE PLUTONIC ROCKS", VARIABLY
16
80
gneiss association is an informal stratigraphic term, introduced by
Culshaw et al. (1988), that is primarily based on rock type, but which
Sand Bay Gneiss Association (units 21 to 24)
Lake
30
53
20
u
50
INTRUSIVE CONTACT
7b
42
66
65
26
Mafic Intrusive Rocks, Coronitic Metagabbro Suite
(circa 1165 Ma)
2 km
Pointe au
Unit 54a, with associated anorthosite and gabbro pods
Lone
87
48a
80
Ri v e r So
72
60
1
45°
48
8
map units in the legend may appear on the map face.
A
Pere Brebeuf Gneiss Association (units 25 and 26)
Tree
80
80
27
coarse-grained, locally ophitic textured, metagabbro
57
81
8
22
28
Weakly foliated to gneissic mafic rocks of unknown
Dark green to black, weakly foliated to gneissic, medium- to
Lake
70
e
dl
id
77
75
Lake
48a
48
65
60
53
Seesee
34
15
Thus, not all
Intermediate to Felsic Rocks
29b
25
74
7a
Naiscoot
C
65
49
el
54a
54b
40´
44
Maps P.3548, P.3549, P.3550, P.3551 and P.3552.
formally name a "gneiss association" as a lithodemic unit under the
and slivers
er
21
52a
78
67
68
0
Byng
facies metamorphism and variably retrogressed
58
79
45
er
Riv
7a
55
62
7b
R
iv
laboratory investigations, including petrography and geochemistry.
This is a legend common to Ontario Geological Survey Preliminary
also may contain information with respect to plutonic history,
protolith and of varied age, subjected to eclogite
Gordon
7b
17
56
Grey biotite-muscovite-garnet-kyanite gneiss and schist
c
Mafic Rocks
Naiscoot
o
ot
7b
78
58
t
oo
Nort h Cha nnel
30
83
30
is c
Na
35
River
34
70
23
80
57
50
a
is
c
60
43
74
39
WITHIN THE GRENVILLE PROVINCE
BURTON TP
7b
7b
This legend is a field legend that locally incorporates the results of
LOCATED WITHIN THE PARRY SOUND SHEAR ZONE
Lake
I.R. 17A
80
Nai scoot
35
80
50
45
51
3
7b
20
a
Metasedimentary Rocks
b
HIGH-GRADE METAMORPHISM
59
60
70
48
54
12
85
75
50b
Timber
17
1000 m
46°
80
7b
NAISCOOT AREA
©
Lake
54
NAISCOUTAING
54
46
hA 974 ± 5
7b
42
16
7a
31
Island
50a
mA 904 ± 6
57
83
70
30
60
6
56
45
40
30
29
MESOPROTEROZOIC
45
70
37
Straight and mylonitic gneiss derived from units 1a
subjected to similar metamorphic conditions, but have been subsequently
8
75
Unit 1a, with minor amounts of unsubdivided polycyclic
and/or 1b
migmatitic granodioritic gneiss
85
58
7b
(590 Ma)
No
leucosome older than the dikes is observed
1c
MAP P.3549
Queen's Printer for Ontario, 2004.
INTRUSIVE CONTACT
29
N
50b
55
48
Gneiss Association (unit 30)
5060000m
Back
36
42
50b
45
20
32
77
4b
55
Wolf
70
85
58
metamorphosed mafic dikes (amphibolite).
Mafic Intrusive Rocks (Grenville diabase dike swarm)
r
e
iv
migmatitic, granodiorite to tonalite containing
1b
Ontario Geological Survey
Scale 1:50 000
Mostly medium-grained, moderately foliated to gneissic,
Para-amphibolite and unsubdivided paragneiss; includes
Pine Island Gneiss Association (units 27 to 29)
mA 899 ± 6
7b
8
80
60
36
20
Lake
44
80
80
5
50a
13
1a
Mafic and Metasedimentary Rocks
NEOPROTEROZOIC
Littles
63
70
35
10
45
64
25
16
50b
25
50
16
55
65
55
7b
20
60
60
R
Intermediate Migmatitic Rocks
1
Gneissic Rocks Structurally Below the Lighthouse
Brown weathering, fine- to medium-grained diabase
is
r
Mafic Rocks
Upper Go Home Domain (units 25 to 29)
Headquarters
30
38
30
4b
Lake
Lake
40
34
Quartzite, minor associated paragneiss
grey to white sublithographic to lithographic limestone)
61
55
5
14
Pike
Skunk
65
7b
50b
80
59
40´
50b
sillimanite gneiss; minor quartzite, calc-silicate gneiss
and metasedimentary gneiss
PRECAMBRIAN
Lake
Harris Lake
20
Layered, pink to grey quartz-feldspar-biotite paragneiss,
locally with garnet-hornblende and garnet-kyanite and
Amphibolite
:
PRECAMBRIAN GEOLOGY
granodiorite orthogneiss
TECTONIC CONTACT (SUSPECT) WITH THE SHAWANAGA DOMAIN,
7b
Mafic monzodiorite gneiss
Layered, migmatitic, grey tonalite, minor trondhjemite,
grey to blue-grey interbedded limestone and dolostone,
Grandpa
16
8
33a
UNCONFORMITY
Lake
50b
35
70
66
8
Mafic gneiss; minor metagabbro, anorthositic gneiss
3b
Unsubdivided: includes Gull River Formation (light brown-
Lake
Log
3a
Metasedimentary Rocks
2
Intermediate to Felsic Rocks with Metadiabase Dikes
quartzofeldspathic gneiss and minor quartzite
Chemical Sedimentary Rocks
arkosic sandstone, pebbly sandstone, siltstone and shale)
Sullivan Lake
Long Moose
Pike
20
44
8
48a
Foster
15
10
p
Lake
50
30
78
wR 1752 ± 95
75
20
45
63
38
ee
3
Quartzite, minor associated paragneiss and para-amphibolite
and Shadow Lake Formation (calcareous red and green
62
Northern
35
40
70
5
25
48
56
Harris Lake
70
D
ig
B
35
53
54
30
45
Laird Rocks
10
5
7b
4b
36
70
35
25
15
4b
40
5
44
50a
10
6
7b
47
50
65
35
7b
36
32
15
30
10
10
36
50
18
65
4a
8
18
8
25
Norgate Inlet
60
Lake
24
20
48
68
30
50
11
50b
49
8
24
61
34
50b
45
85
60
70
75
50
66
56
16
8
1
50
34
75
47
66
65
Norgate
76
Giroux
65
zU 1457 ± 8
19
40
Mafic Rocks
pelitic and garnet-rich gneiss interlayered with
WALLBRIDGE TP
4a
38
31
Burton
South Branch
66
35
38
6
82
84
2
2
10
57
4a
52a
5
60
5
20
3
10
50b
19
MIDDLE ORDOVICIAN
63
Lake
54
84
7b
Doctor
Magnetawan
4a
50b
Mafic and Metasedimentary Rocks
ORDOVICIAN
South
5
85
46
57
50b
19
8
25
52a
11
47
20
35
50a
13
48
Predominantly grey gneiss with pink granitic leucosome
Bustard Islands Gneiss Association (unit 1)
32
68
70
Pink, sugary leucocratic gneiss
4c
33b
PALEOZOIC
43
74
63
4c
10
70
19
50
33
64
70
4b
quartzite
UNCONFORMITY
30
11
50b
36
and till
45
45
Unsubdivided pink and grey leucocratic gneiss
Para-amphibolite, layered mafic gneiss, paragneiss and
Glacial deposits; sand and gravel, clay
57
4a
50b
8
66
4a
4c
70
8
50b
4a
Lighthouse Gneiss Association (units 31 to 33)
5
4a
4
Mafic Rocks
PLEISTOCENE
Lake
20
70
54
34
65
80
50b
1
11
Lake, stream and swamp deposits
Granite
54
Intermediate to Felsic Rocks
35
RECENT
Magnetawan
69
50
39
Tea Lake
5
4
Multicomponent layered gneiss and migmatite, minor
Armer Bay Gneiss Association (units 34 and 35)
QUATERNARY
North
MAGNETAWAN I.R. 1
27
30
BROWN TP
Lake
4a
5
Parry Sound Domain (basal) (units 30 to 35)
CENOZOIC
5066000m
8
8
50b
Key Harbour Gneiss Association (units 2 to 5)
LOCATED WITHIN PARRY SOUND SHEAR ZONE
amphibolite
Ri
ve
r
4a
50b
47
27
Island
529
18
65
an
THRUST CONTACT WITH PARRY SOUND DOMAIN (BASAL),
Intermediate to Mafic Migmatitic Rocks
PHANEROZOIC
Miner
17
4a
eta
w
abc
45°45´00
Lake
y
49
35
M agn
5
4 10
10
37
5
30
15
78
50b
54
53
52
51
61
560000m
59
LEGEND
80°10´58
a
28
44
50b
55
52b
550000m
49
48
47
46
MAGNETAWAN I.R. 1
4a
75
4a
45
44
58
57
56
B
50
22
4a
Olga
50b
40
Island
45
50
50b
43
42
41
540000m
39
38
37
8
26
37
1
4a
36
35
34
33
ga Inl
et
40
50a
70
32
34
52b
5066000m
31
530000m
Sha
wa
na
45°45´00
29
28
a
r
27
26
55
563000m
62
H
25
e
24
k
23
30´
35´
40´
522000m
25´
a
80°43´40
15´
20´
Issued 2004.
Information from this publication may be quoted if credit is given.
form:
rusty weathering
6b
Calc-silicate and amphibolite gneiss associated with
garnet-biotite paragneiss of unit 6a
Culshaw, N.G., Corrigan, D., Ketchum, J.W.F., Wallace, P. and
Wodicka, N. 2004. Precambrian geology, Naiscoot area; Ontario
Geological Survey, Preliminary Map P.3549, scale 1:50 000.
80°10´55
It is
recommended that reference to this map be made in the following
81°00´00
501000m
02
03
04
06
05
50´
55´
07
510000m
09
08
12
11
13
16
15
14
19
18
17
40´
45´
22
21
520000m
24
23
530000m
29
28
27
26
25
Island
STRUTHERS
70
51b
Pi
51b
Island
l
e re
ck
FRENCH RIVER I.R. 13
iv
e
re
ek
g
C
ke
Da
lle
s
iv
Pickerel
e
r
r
e
k
91
FRENCH RIVER I.R. 13
51b
MIDDLE ORDOVICIAN
Nisbet Lake
51b
Lake
56
5
51b
Lake
French River
5090000m
Island
er
Bucke
Ri
v
nc
h
F re
89
Lake
47a
31
Mafic monzodiorite gneiss
2
Intermediate to Felsic Rocks with Metadiabase Dikes
33a
Layered, pink to grey quartz-feldspar-biotite paragneiss,
Layered, migmatitic, grey tonalite, minor trondhjemite,
locally with garnet-hornblende and garnet-kyanite and
granodiorite orthogneiss
sillimanite gneiss; minor quartzite, calc-silicate gneiss
Quartzite, minor associated paragneiss
Mafic Rocks
Amphibolite
1a
Mostly medium-grained, moderately foliated to gneissic,
migmatitic, granodiorite to tonalite containing
Para-amphibolite and unsubdivided paragneiss; includes
metamorphosed mafic dikes (amphibolite).
pelitic and garnet-rich gneiss interlayered with
leucosome older than the dikes is observed
1b
grey to blue-grey interbedded limestone and dolostone,
Gneissic Rocks Structurally Below the Lighthouse
grey to white sublithographic to lithographic limestone)
Gneiss Association (unit 30)
1c
89
Unit 1a, with minor amounts of unsubdivided polycyclic
Straight and mylonitic gneiss derived from units 1a
and/or 1b
Metasedimentary Rocks
This legend is a field legend that locally incorporates the results of
Grey biotite-muscovite-garnet-kyanite gneiss and schist
laboratory investigations, including petrography and geochemistry.
b
This is a legend common to Ontario Geological Survey Preliminary
Maps P.3548, P.3549, P.3550, P.3551 and P.3552.
LOCATED WITHIN THE PARRY SOUND SHEAR ZONE
NEOPROTEROZOIC
A
gneiss association is an informal stratigraphic term, introduced by
Culshaw et al. (1988), that is primarily based on rock type, but which
also may contain information with respect to plutonic history,
t
Bass Lake
50
5
ox
Cre e k
1a
4a
5
Brown weathering, fine- to medium-grained diabase
iv
e
45
hA 1020 ± 5
1a
Gateway
R
l
Grundy
1b
35
5
Dokis I sla
n
40
30
30
Major
65
Island
30
44
52c
20
27
40
1a
52a
1b
40
51b
30
25
50a
kA 980 ± 8
mA 934 ± 7
dU >1454
Outer Fox
46
50
Island
50b
52
51b
52
50
40
15
1a
45
45
2
51b
4a
4a
2
tU 972 ± 7
60
2
59
68
4a
50
4a
8
81
2
50b
50
2
2
5
2
Churchill
4
35
66
61
55
4a
6
20
6
80
40
4a
70
4a
50
27
47
2
4c
22
50
7
47
25
70
53
38
50a
4c
50a
50´
4a
21
75
48
4c
4c
2
86
55
27
Ch
36
4a
am
p
25
50b
la
la
Is
d
n
10
8
70
tU 990 ± 2
70
46
4a
50a
73
15
2
7
36
45
Rock
43
5
50b
58
10
20
14
65 15
43
75
25
9
13
50a
14
23
48a
72
10
35
21
44
5
70
20
32
20
11
40
17
15
30
ck
Bla
70
ek
Cre
35
75
3
4a
50
3
63
50
20
23
8
2
50b
37
2
17
2
53
50
4c
55
25
66
17
18
25
35
25
12
15
Bigwood
50a
50
15
69
Rocks
11 50
4a
5
02
03
04
05
06
07
55´
08
09
510000m
11
12
13
50´
14
15
16
17
18
19
45´
520000m
21
22
23
24
25
26
40´
27
30
68
530000m
31
19c
Grey hornblende-epidote-biotite tonalitic orthogneiss
46
32
35´
33
34
5067000m
4a
36
11
Orrville
35
Dorset
Rosseau
Port Sydney
141
BAY
Tobermory
Dwight
60
Huntsville
Parry Sound
117
Sans
Souci
Dyer's Bay
Baysville
MacTier
P.3551
118
400
Bala
118
Bracebridge
169
45°
Edenhurst
bA 978 ± 6
survey
Location of isotopic
age determination
Honey
Harbour
45°
Purple
Valley
LAKE
Penetanguishene
Gravenhurst
P.3552
Red Bay
Norland
Washago
12
Wiarton
Nottawasaga
81°
Midland
Bay
Leith
Shallow
11
80°
169
79°
Orillia
12
48
Brechin
26
Location Map
1 cm equals 25 km
SOURCES OF INFORMATION
Thematic information on this map is tied to a digital base map derived
from map 41 H/15 of the National Topographic System, scale 1:50 000.
Universal Transverse Mercator (UTM) co-ordinates are in North
Intermediate to Felsic Rocks
43a
Pink, sugary, layered leucocratic gneiss
43b
Grey biotite leucogneiss of granodioritic composition
Mafic Rocks
Geological Survey of Canada Ontario Department of Mines 1965.
Aeromagnetics, Key Harbour; Geological Survey of Canada Ontario
ABBREVIATIONS
Department of Mines, Geophysical Map 1508G, scale 1:63 360.
Ontario Geological Survey 2002.
Nb...........................................................niobium
(MDI2)
Mineral Deposit Inventory Version 2
October 2002 Release; Ontario Geological Survey, Digital Data.
Corrigan, D., Culshaw, N.G. and Mortensen, J.K. 1994. Pre-Grenvillian
evolution and Grenvillian overprinting of the Parautochthonous Belt in
the Key Harbour area, Ontario: U-Pb constraints; Canadian Journal of
Earth Sciences, v.31, p.583-596.
Culshaw, N.G., Corrigan, D., Drage, J. and Wallace, P. 1988. Georgian
Bay geological synthesis: Key Harbour to Dillon, Grenville Province of
Ontario; in Current Research, Part C, Geological Survey of Canada,
Paper 88-1C, p.129-133.
bA = biotite Ar/Ar date, in Ma
hA = hornblende Ar/Ar date, in Ma
Culshaw, N., Reynolds, P.H. and Check, G. 1991. A
40
39
Ar/
Ar study of
post-tectonic cooling in the Britt domain of the Grenville Province,
Ontario; Earth and Planetary Science Letters, v.105, p.405-415.
bK = biotite K/Ar date, in Ma
kK = potassium feldspar K/Ar date, in Ma
Cumming, G.L., Wilson, J.T., Farquhar, R.M. and Russell, R.D. 1955.
mA = muscovite Ar/Ar date, in Ma
Some dates and subdivisions of the Canadian Shield; Geological
dU = baddeleyite U/Pb date, in Ma
Association of Canada, Proceedings, v.7, p.27-79.
nU = monazite U/Pb date, in Ma
tU = titanite U/Pb date, in Ma
Davidson, A. and Bethune, K.M. 1988. Geology on the north shore of
zU = zircon U/Pb date, in Ma
Georgian Bay, Grenville Province of Ontario; in Current Research, Part
uW = uraninite Pb/Pb date, in Ma
C, Geological Survey of Canada, Paper 88-1C, p.135-144.
the Grenville Front, Ontario; in Radiogenic age and isotopic studies:
Report 8; Geological Survey of Canada, Paper 94-F, p.107-114.
18b
Pink to grey, migmatitic leucogranite to granodiorite
Intermediate to Felsic Rocks
metadiabase near Key Harbour, Britt domain, Grenville Province,
17a
Unclassified granitoid orthogneiss
Ontario; in Radiogenic age and isotopic studies 14, Geological Survey
17b
Monzonitic to granitic orthogneiss
of Canada, Current Research, Paper 2001-F7, 11p. (available in
Mafic Rocks
Mafic orthogneiss
Metasedimentary Rocks
15a
Lowdon, J.A. 1960. Age determinations by the Geological Survey of
60-17, 51p.
Unclassified paragneiss
15b
Marble; may be associated with rusty graphitic schist
Lowdon, J.A. 1961. Age determinations by the Geological Survey of
15c
Calc-silicate gneiss
Canada, Report 2: isotopic ages; Geological Survey of Canada, Paper
61-17, 127p.
Reynolds, P.H., Culshaw, N.G., Jamieson, R.A., Grant, S.L. and
PARAUTOCHTHON NORTH OF PARRY SOUND DOMAIN
McKenzie, K. 1995.
40
39
Ar/
Ar traverse - Grenville Front Tectonic Zone
to Britt Domain, Grenville Province, Ontario, Canada; Journal of
Britt Domain (units 1 to 14)
14
Migmatitic Rocks
of granodioritic to monzodioritic composition
13
Metamorphic Geology, v.13, p.209-221.
Magnetic declination approximately 10°22'W in 2004.
Geology not tied to surveyed lines.
Grey, migmatitic, leucocratic hornblende-biotite orthogneiss
Metric conversion factor:
1 foot = 0.3048 m.
Migmatitic Rocks
CREDITS
Grey, leucocratic, migmatitic hornblende-biotite-garnet
orthogneiss of tonalitic to granodioritic composition
12
Metasedimentary Rocks
N. Wodicka, 1987 to 1990.
Unclassified paragneiss
11
Metasedimentary Rocks
Pink, layered, leucocratic paragneiss
Digital drafting by S. Josey.
Metasedimentary Rocks
Geology, legend and mineral deposit information reviewed by
Felsic Rocks
10
Rusty weathering, graphitic paragneiss
R.M. Easton.
Intermediate to Felsic Granulites
9
Metasedimentary Rocks
Cartographic production by S. MacLean.
Grey, migmatitic, leucocratic garnet-biotite paragneiss,
locally with sillimanite; pink leucosome, may contain garnet,
To enable the rapid dissemination of information, this map has not
muscovite, magnetite
received a technical edit.
Intermediate to Felsic Granulites (layered)
Discrepancies may occur for which the
Ontario Ministry of Northern Development and Mines does not assume
Bayfield Gneiss Association (units 6 to 8)
liability.
Intermediate to Felsic Granulites (retrogressed)
8
Intermediate to Felsic Rocks
Issued 2004.
Users should verify critical information.
Pink, sugary leucocratic gneiss
Information from this publication may be quoted if credit is given.
7
recommended that reference to this map be made in the following
7a
form:
538000m
Unsubdivided grey and pink, variably layered, highly
strained orthogneiss, in places with recrystallized
7b
Mafic Rocks
Metasedimentary Rocks
36a
Layered paragneiss, garnet-rich granulite
36b
Marble, calc-silicate tectonic breccia
80°30´00
It is
Intermediate to Felsic Intrusive Rocks
Grey, leucocratic, migmatitic hornblende-biotite-garnet
orthogneiss of tonalitic to granodioritic composition
6
6a
Grey, leuco- to mesocratic garnet-biotite paragneiss,
commonly with sillimanite; locally graphitic and
rusty weathering
6b
Calc-silicate and amphibolite gneiss associated with
garnet-biotite paragneiss of unit 6a
80
35
Nobel
Pink to grey leucocratic gneiss
Metasedimentary Rocks
36
37
GEORGIAN
Novar
Broadbent
18a
Unsubdivided, layered, predominantly mafic two-pyroxene
36
75
8
37
49
36
50
Waubamik
Dillon
Kearney
Sprucedale
McKellar
69
Felsic Rocks
granulite or gneissic metagabbro
40
66
50
5
29
Grey, migmatitic, tonalitic to granodioritic gneiss with
potassium feldspar megacrysts
45°45´00
28
Grey metatextite with pink, hornblende-epidote-bearing
19b
529
40
42
45°45´00
501000m
I.R. 1
38
4a
denotes limits of area
19a
Quartzite
evidence of retrogression from a granulite facies precursor
56
4a
43
12
30
15
50a
85
645
WALLBRIDGE TP
Inventory (MDI))
Limit of mapping;
Zr...............................................................zircon
(e.g., unit 39 or 40); pegmatite veins may be common
MAGNETAWAN
56
50b
Interlayered amphibolite, semi-pelitic gneiss and
(granodiorite, tonalite to diorite) orthogneiss containing
50b
25
81°00´00
78
30
34
55
38
28
bA 1004 ± 6
44
Mineral Deposit
U ............................................................uranium
Unsubdivided, grey, foliated to gneissic, intermediate
U
hA 967 ± 7
30
60
40
McNab
60
35
Island
2
69
Byng Inlet
60
Burk's Falls
Pointe au
Baril Station
granulite
Magnetaw an Ri v er
65
30
Magnetawan
Dunchurch
BASE OF LOWER GO HOME DOMAIN NOT OBSERVED
Unsubdivided, buff to grey weathering, layered, feldspathic
60
Island
5
39
5
4
55
70
50
Clark
4a
65
15
orthogneiss
64
fel
75
48
50
5
(as classed by the
(interpreted)
mapped during this
Ahmic
Harbour
Ardbeg
Canada, Report 1: isotopic ages; Geological Survey of Canada, Paper
48
85
73
32
30
5067000m
80
13
22
86
30
66
37
10
68
40
5
50a
Byng
electronic form only).
35
35
50
4a
17
Nb,gt,Th
5070000m
Britt
45
66
44c
bearing intermediate (granodiorite, tonalite to diorite)
11
mA 904 ± 8
Amphibolite
Buff to pink weathering, leucocratic granulite
30
40
Mafic orthogneiss
44b
Unsubdivided, grey to buff weathering, orthopyroxene-
60
17
10
10
41
67
25
65
50
69
71
57
South River
Sundridge
Magnetawan
Geological compilation by N.G. Culshaw, 1991 and 2004.
Britt
36
P.3548
Geology by N.G. Culshaw, D. Corrigan, J.W.F. Ketchum, P. Wallace and
84
16
50a
44a
TECTONIC CONTACT WITH SUBJACENT
20
65
4a
occurrences
Geological contact
Migmatitic Rocks
uW 875
Station
65
Port Loring
North
Davidson, A. and van Breemen, O. 2001. Baddeleyite U-Pb age of
Mafic and Metasedimentary Rocks
Parry Sound Domain (interior) (units 36 to 41)
5
Pakesley
Britt
Davidson, A. and van Breemen, O. 1994. U-Pb ages of granites near
18
Amphibolite
72
Key
Commanda
Honey Harbour Gneiss Association (units 15 to 18)
Intermediate to Felsic Rocks
uW 1043
fel
35
75
50a
kK 835 ± 50
50
4c
4c
Grey, migmatitic layered gneiss
PARRY SOUND DOMAIN (INTERIOR)
15
32
27
U
42
37
20
14
47
bK 779 ± 50
St gn
23
4c
54
discretionary
Th............................................................thorium
5
80
50a
62
75
20
46b
34
80 45
50
5
50b
5070000m
43
Zr,U,fel
REE,Nb
45
8
29
54
fel,
65
28
49
65
15
12
60
20
75
25
39
6
35
20
6
25
55
54
75
10
71
17
prospects,
(with plunge)
Unsubdivided pink and grey leucocratic gneiss
PARAUTOCHTHON SOUTH OF PARRY SOUND DOMAIN
73
Be,Th,Ti,
22
5
16
50
70
Still River
38
4a
m-asymmetry
St gn ..............................................stone, gneiss
Blackstone Lake Gneiss Association (units 42 and 43)
21
3
10
25
86
53
48
Mineral occurrences,
Intermediate to Felsic Rocks
Nadeau Island Gneiss Association (units 9 to 14)
60
4
17
9
Pink, sugary, layered leucocratic gneiss
quartzite
39
4c
46a
44d
31
38
10
4
50b
fel
66
4c
40
fel
31
35
Fold axis; minor fold,
fel ...........................................................feldspar
(NADEAU ISLAND GNEISS ASSOCIATION):
38
16
in opposite directions
Quartzite
ALLOCHTHON-PARAUTOCHTHON BOUNDARY
Felsic to Intermediate, Layered or Migmatitic Rocks
52
31
36
3
85
72
Flat Rock
46
45
4a
35
65
45
42
25
56
4a
26
63
49
HENVEY TP
51
2
Bessener
24
45
9
24
38
44
74
24
4c
26
34
15
60
13
50
63
(with plunge)
kA = potassium feldspar Ar/Ar date, in Ma
Grey, migmatitic tonalite to granodiorite orthogneiss
48
50
25
45
80
50a
trend only, limbs dip
21e
TECTONIC CONTACT WITH SUBJACENT BRITT DOMAIN
40
30
15
45
26
64
5
80
10
43
52
50a
15
50
38
55
45
34
35
50
11
27
26
2
47
2
8
in
74
6
18
25
60
34
38
75
65
50
Intersection lineation
Be.........................................................beryllium
varied amounts of pink leucosome
16
46
Still River
35
55
25
47
4a
51
35
leucosome
35
53
unknown generation,
Para-amphibolite
Moon River Gneiss Association (units 44 to 46)
50´
41
4c
50
19
Moon River Subdomain (units 42 to 46)
36
5
2
50b
4a
21
7
Synform, interpreted;
Ti ............................................................titanium
17
53
78
22
50a
20
43
50b
17
INTRUSIVE CONTACT
48
32
42
subhorizontal)
Calc-silicate gneiss
LATE PALEOPROTEROZOIC
76
83
46°
Restoule
Head
REE .....................................rare earth elements
EARLY MESOPROTEROZOIC to
77
Fossmill
Lion's
Lineation (with plunge,
21d
ALLOCHTHON
50a
27
56
4
5
23
34
in opposite directions
35
Kiosk
79°
Powassan
Pickerel
6
gt .............................................................garnet
24
16
trend only, limbs dip
21c
Lower Go Home Domain (units 15 to 18)
20
50
60
17
47
15
40
34
52
22
unknown generation,
Pink to grey marble
Small outcrops of unit 47a or 47b hosted by adjacent
17
10
Foliation (inclined)
21b
tectonostratigraphic boundaries) (indicated by triangles)
18
22
42
Georgian Bay
5
HENVEY INLET I.R. 2
5
Antiform, interpreted;
Medium to dark grey, biotite-rich quartz-plagioclase
Ojibway Gneiss Association (units 19 and 20)
Weakly foliated to gneissic, mafic intrusive complex
27
52
50
4c
Anorthosite, gabbroic anorthosite, minor gabbro
country rock units (commonly found along
50b
5
21a
horizons
consisting of gabbro, anorthosite and ultramafic rocks
47c
28
32
30
8
10
46
4a
bA 993 ± 5
76
33
63
35
4b
Small outcrops of unit 48a or 48b hosted by adjacent
78
52
39
2
21
10
84
29
Islands
mA 922 ± 3
46
56
2
Islands
37
18
30
39
Weakly foliated to gneissic metagabbro, primary
48c
47a
80°
Noëlville
P.3550
paragneiss and schist ("Dillon schist") with quartzite
Unit 50a, with associated pink granite and grey
Hornblende diorite, gabbro
60
5
only
vertical)
Metasedimentary Rocks
Mafic Intrusive Rocks, Anorthosite Suite
Bekanon
4c
53
20
Dark grey dioritic orthogneiss, possible hypabyssal
Weakly foliated to gneissic, grey hornblende-biotite
48b
47b
28
30
Henvey
2
58
38
77
4a
75
21
71
24
16
39
79
11
13
50a
36
3
5
4a
35
11
Alban
American Datum 1983 (NAD83), Zone 17.
Unit 51a, with associated granite and monzonite
igneous texture commonly preserved
47
51
22b
intrusion (circa 1450 Ma)
Intermediate Intrusive Rocks
48a
5
36
Grey tonalitic orthogneiss
Mafic Intrusive Rocks
48
20
40
30
40
22a
country rock units (indicated by dots)
38
37
45
5
2
26
55
46
Intermediate Rocks
Weakly foliated to gneissic, pink monzonite, minor
granodiorite and monzodiorite
38
65
5
2
51b
45
55
46
70
57
51
5
50b
70
27
54
65
18
50a
2
22
15
50a
48
3a
8
Pink, migmatitic, sugary leucocratic gneiss and subordinate
Weakly foliated to gneissic, grey tonalite with associated
34
51b
22
er
49
70
48a
4a
78
70
Unit 52a, strongly foliated to protomylonitic
granodiorite
iv
5080000m
5
50
76
R
5
2
4a
4a
e
y
12
51b
zU 1442 ± 7
50a
12
5
57
Felsic Rocks
grey, migmatitic leucogneiss
Unit 52a, with associated granite and quartz monzonite,
minor tonalite
K
58
50b
23
granodiorite, locally potassium feldspar megacrystic,
50b
zU 945 ± 47
12
79
22
hA 968 ± 5
50a
55
37
4b
27
47a
5
45
78
Grey, layered quartzofeldspathic gneiss containing
Intermediate to Felsic Intrusive Rocks
81
26
bA 978 ± 6
30
51b 50a
27
40
50
50
Lake
40
(trend only, inclined,
Intermediate to Felsic Rocks
Straight
40
10
50a
mA 924 ± 3
4a
45
5080000m
10
kA 902 ± 6
45
26
60
Pink, leucocratic granite, locally potassium feldspar
2
51b
62
51b
50
80
26
St gn
81
12
58
21
18
46
13
40
5
50a
Gull
Rocks
1a
Island
zU 1146 ± 137
47
54
interpreted; trend
syenite
e
tl
50
subsidiary agreement to the Economic and Regional Development
HURON
24
Felsic to Intermediate Intrusive Rocks
51a
82
20
21
40
55
53
65
48
52c
Ludgate
51
52
54
8
3b
Mann
25
zU 1684 ± 8
1a
47
Key River
Key River
Lineament,
unknown generation
Grey, migmatitic tonalitic and granodioritic orthogneiss
commonly potassium feldspar megacrystic
it
L
50
50a
Bigsby
1a
Ontario 1985 Mineral
Development Agreement (COMDA), a
P.3549
foliation;
Shawanaga Domain (units 19 to 24)
megacrystic
32
25
15
44
70
mA 903 ± 9
Key Harbour
50b
Island
52
66
20
1a
55
4a
tU ~980
Island
50
1b
51b
51b
52a
83
r
5
40
75
zU 1456 ± 12
Dead
45
60
4b
tU 1015 ± 16
30
35
the five-year Canada
Inlet
Felsic Intrusive Rocks
52b
52a
4a
51b
Bay Geological Synthesis, funded as part of
Trout Creek
trend only
parallel tectonic
Pink, sugary leucocratic granite gneiss
hornblende, biotite, epidote
Key Ri v
e
nU 1035 ± 1
Islands
1b
mapping program, Project C.2.3, Georgian
46°
Fault, interpreted;
layering and/or
Felsic Rocks
ALLOCHTHON-PARAUTOCHTHON BOUNDARY
Portage Lake
51b
5
Bustard
Tanvat
Mapping was conducted as part of a three-year
Harbour
Compositional
35
COMMONLY CONTAINING GARNET
50a
60
50
4a
1bc
47a
45
1c
81
DEFORMED AND MIGMATITIC ORTHOGNEISS,
50a
45
Geological Survey.
Killarney
Layered to podiform calc-silicate gneiss
"SINGLE CYCLE PLUTONIC ROCKS", VARIABLY
n Cree k
45
84
4a
Metasedimentary Rocks
Sand Bay Gneiss Association (units 21 to 24)
51b
4a
37
Burnt
INTRUSIVE CONTACT
51b
52
Island
82
30
Mafic orthogneiss, amphibolite
TECTONIC CONTACT WITH SUBJACENT LOWER GO HOME DOMAIN:
coarse-grained, locally ophitic textured, metagabbro
Cranberry
1a
hA 990 ± 5
(circa 1165 Ma)
9
35
Islands
83
Pakesley
50a
35
1a
1c
50a
75
1a
hA 998 ± 8
53
522
25
zU 1013 ± 2
kA 922 ± 8
Mafic Intrusive Rocks, Coronitic Metagabbro Suite
55´
30
REE
48
This map is published with the permission of the Director, Ontario
French River
Intermediate to Felsic Rocks
25
Dark green to black, weakly foliated to gneissic, medium- to
30
26
Unit 54a, with associated anorthosite and gabbro pods
69
45
50
hA 991 ± 5
9
nd
Isla
ick
dd
Pu
38
40
NTS Reference: 41 H/15
81°
Mafic Rocks
Pere Brebeuf Gneiss Association (units 25 and 26)
Weakly foliated to gneissic mafic rocks of unknown
and slivers
MOWAT TP
85
mA 932 ± 7
52c
54a
54b
Gut
Lake
20
4a
51b
50
80
51b
4a
5
47a
ds
ar
bo
5
4a
Beka no
T
in
F
54
protolith and of varied age, subjected to eclogite
35
1a
Island
2 km
Agreement (ERDA) signed by the governments of Canada and Ontario.
Grey, migmatitic tonalitic and granodioritic orthogneiss
35
facies metamorphism and variably retrogressed
kA 936 ± 8
hA 992 ± 8
84
Dock
27
er
86
Island
38
correspond to a suite or a complex.
Grey, heterogeneous, leucosome-rich (>25%),
SYMBOLS
Mafic Rocks
d
mA 931 ± 7
45
e
h
WITHIN THE GRENVILLE PROVINCE
50a
1bc
35
r
ge
Ri
v
50a
1a
55´
g
Fox
45
85
ka
Lake
50
28
HIGH-GRADE METAMORPHISM
s
e
35
52b
zU 1467 ± 11
h
Lake
50
Clear
50
1983 North American Stratigraphic Code, in most cases, they would
29a
P
a
Gurd
Lake
50a
25
MESOPROTEROZOIC
k
50a
20
86
1
69
1a
1c
Intermediate to Felsic Rocks
29b
INTRUSIVE CONTACT
87
Islands
30
29
PARK
P
ic
87
51b
25
If it were decided to
migmatitic granodioritic gneiss
PROVINCIAL
70
k
e
re
52b
kA 917 ± 8
51b
(590 Ma)
GRUNDY LAKE
r
1b
45
52c
55
metamorphism or intrusion of mafic dikes.
formally name a "gneiss association" as a lithodemic unit under the
Mafic Intrusive Rocks (Grenville diabase dike swarm)
88
51b
F
1a
51b
ek
re
88
Pine Island Gneiss Association (units 27 to 29)
C
47a
1c
Thus, not all
map units in the legend may appear on the map face.
c
Upper Go Home Domain (units 25 to 29)
e
hA 1005 ± 8
a
TECTONIC CONTACT (SUSPECT) WITH THE SHAWANAGA DOMAIN,
is
b
0
Queen's Printer for Ontario, 2004.
30
PRECAMBRIAN
N
No
1000 m
©
Lake
kA 929
KEY HARBOUR AREA
Scale 1:50 000
Intermediate Migmatitic Rocks
1
Mafic and Metasedimentary Rocks
UNCONFORMITY
King's Island
Ontario Geological Survey
PRECAMBRIAN GEOLOGY
and metasedimentary gneiss
51b
Pakeshkag
Mafic gneiss; minor metagabbro, anorthositic gneiss
3b
Unsubdivided: includes Gull River Formation (light brown-
50a
50
PROVINCIAL PARK
3a
Metasedimentary Rocks
quartzofeldspathic gneiss and minor quartzite
Chemical Sedimentary Rocks
arkosic sandstone, pebbly sandstone, siltstone and shale)
5
Quartzite, minor associated paragneiss and para-amphibolite
and Shadow Lake Formation (calcareous red and green
1bc
FRENCH RIVER
Mafic Rocks
3
ORDOVICIAN
Fox
Rock
Mafic and Metasedimentary Rocks
Bustard Islands Gneiss Association (unit 1)
32
Lake
5090000m
Predominantly grey gneiss with pink granitic leucosome
33b
PALEOZOIC
Tower
4c
UNCONFORMITY
R
47a
Lake
River
quartzite
a
R
k
nc
h
33
h
Fr
e
s
ke
r
a
and till
Junction
51b
Walter
French
Pink, sugary leucocratic gneiss
Glacial deposits; sand and gravel, clay
57
92
P
Suc
91
55
39
re
Unsubdivided pink and grey leucocratic gneiss
4b
Lighthouse Gneiss Association (units 31 to 33)
50a
Key
34
5
50
C
4a
Para-amphibolite, layered mafic gneiss, paragneiss and
PLEISTOCENE
26
Pike Lake
Intermediate to Felsic Rocks
4
Mafic Rocks
:
MAP P.3548
Lake, stream and swamp deposits
92
35
RECENT
Cantin Lake
5
Multicomponent layered gneiss and migmatite, minor
Armer Bay Gneiss Association (units 34 and 35)
QUATERNARY
47a
5
Intermediate to Mafic Migmatitic Rocks
5
Parry Sound Domain (basal) (units 30 to 35)
CENOZOIC
Cantin Island
er
Riv
5093000m
51b
5
Pickerel Riv
er
TRAVERS TP
Key Harbour Gneiss Association (units 2 to 5)
LOCATED WITHIN PARRY SOUND SHEAR ZONE
amphibolite
Merranger's
5093000m
THRUST CONTACT WITH PARRY SOUND DOMAIN (BASAL),
Island
Wanikewin
60
47a
abc
PHANEROZOIC
94
Mile
Fourteen Mile Island
1bc
51b
538000m
37
36
Fourteen
McDougal
94
King's Island
35
34
33
46°00´00
46°00´00
TP
LEGEND
80°30´00
35´
32
31
Culshaw, N.G., Corrigan, D., Ketchum, J.W.F., Wallace, P. and
Wodicka, N. 2004. Precambrian geology, Key Harbour area; Ontario
Geological Survey, Preliminary Map P.3548, scale 1:50 000.