Download Geology, Geochronology, Lithogeochemistry and Metamorphism of

BC Geological Survey
93
94
95
96
97
98
99
01
600000E
03
02
04
Cardigan
Rocks
06
Raglan
Point
36
08
35
34
Geology, Geochronology, Lithogeochemistry and Metamorphism
of the Quatsino-Port McNeill Area, Northern Vancouver Island
JIqpo
lmJH
uTrP uTrQ
TrJN
uKN
610000E
Tribune
Rock
0
uTrmKh
11
Boyle
12
Island
uTrlKp
13
NTS 092L/11 and parts of 92L/05, 12 & 13
lmJH
-500
uTruKf
uTruKf
-1000
uTruKf
G.T. Nixon, J.L. Hammack, V.M. Koyanagi, G.J. Payie, A.J. Orr, J.W. Haggart,
M.J. Orchard, E.T.Tozer, R.M. Friedman, D.A. Archibald, J. Palfy and F. Cordey
TrJN
uTrmKh?
14
Crane Islands
uTrP
-1500
15
(no vertical exaggeration)
PALEONTOLOGY
by
M.J. ORCHARD, E.T. TOZER (Geological Survey of Canada)
J. PALFY (Hungarian Natural History Museum)
F. CORDEY (University of Lyon)
16
Hussar
Point
33
uTruKf
500
09
George
Rock
Balaklava
Lake
GEOSCIENCE MAP 2011-2
F
metres
1000
07
Scarlett
Point
Holberg Fault
E
05
Bell
17
Island
18
Heard
Lucan
32
Boxer
Point
Islands
19
Island
Go
Point
Nolan
Jerome
Island
31
620000E
rd
on
Port Hardy
Noble
Islets
Blyth
Islands
Port McNeill
21
Isl
an
ds
Port Alice
22
563000N
Duncan
26
27
29
LAYERED ROCKS
Canada
USA
Nanaimo
2011-2
2011-1
28
2011-3 2011-4 2011-5
630000E
28
31
Frankham
Point
0
32
100
16
36
Numas
Staples
Islet
38
39
41
Massive conglomerate with minor lenses of coarse-grained lithic wacke
uKBcg
23
Daphne
Point
33
28
25
31
80
43
22
Peel Island
5620000N
19
R
u
Bear
Cove
12
Twin
Rocks
10
20
Cu
nn
Cre ingh
ek am
Jensen
Cove
29
r
iv e
Patrician
Cove
Cunningham
Lake
l
T su
18
qu
a te
18
35
60
River
10
20
53
34
37
36
32
Glenlion
45
16
th
B oo
34
Dick
ick
50
36
Creek
Malcolm
Point
14
Bere
Point
15
31
15
Black
Bluff
30
mJHf
14
14
51
False
Head
83
39
55
13
Ri
r
ve
13
46
Creek
5
44
bell
12
40
Caledonia
52
41
Quatse
87
45
09
58
76
29
40
64
15
43
ek
15
20
40
Frances Lake
Orr
Island
18
20
Ledge
Point
Long
73
Straggling
Haddington
Island
lJLm
7
07
Lake
Beaver
Lake
14
Islands
05
Michelsen
Point
lJLx
32
28
50
Creek
05
84
Thorp
Point
34
Co
e tk
wa
50
50
Hankin
Point
52
14
20
Col
ony
55
a
40
Kultah
Point
32
24
38
23
ee
k
22
35
28
50
76
50
O'Connor Lake
k
ee
40
59
Ohlsen
Point
55
99
45
Lindgren
Point
43
53
Ildstad
Islands
50
42
66
71
ok
Kokwina
Cove
Cross
Island
we
Cr
34
16
45
Newcomb
Rocks
75
30
26
86
52
36
42
Holloway 67
Point
62
75
Norgar
Islet
Lakken
Point
20
94
26
53
17
40
94
Smi
th
47
ve
C
27
Se
97
98
99
14
15
16
17
18
19
620000E
21
22
24
23
25
26
27
29
28
630000E
31
32
33
34
35
36
37
38
39
C
41
640000E
D
Holberg Fault
Zone
Mount
Byng
1000
k
re e
20
93
500
37
-500
(MgO>12 wt %)
Picrite
< 53
Basalt
_
< 53
Flooded land (swamp)
Island Copper pit (flooded)
Stream or river
Contour (100m)
Spot height (m)
Road (gravel)
Road (paved)
1º 13'
Approximate mean magnetic
declination February 2011 for
centre of map area: 18 degrees
29 minutes east, decreasing
annually 12.9 minutes per year
Muller, J. E. and Roddick J. A. (1983): Geology, Alert Bay - Cape Scott, British Columbia; Geological Survey of
Canada, Map 1552A, scale 1:250 000.
Muller, J. E., Northcote, K. E. and Carlisle, D. (1974): Geology and mineral deposits of Alert Bay - Cape Scott
map area, Vancouver Island, British Columbia; Geological Survey of Canada, Paper 74-8, 77 pages.
lJLm?
uTrP
uTrQ
02
03
04
uTrQ
-1500
(no vertical exaggeration)
05
90
90
06
uTrP uTrQ
uTruKf
uTruKf
uTrmKh?
uTrP
uTrQ
mJHm
Base map produced from digital TRIM (Terrain
Resource Inventory Management) 1:20 000-scale
topographic database, British Columbia Ministry of
Natural Resource Operations.
Basaltic
Andesite
>53 _< 57
Andesite
>57 _< 63
North American Datum 1983 (NAD83). Universal
Transverse Mercator Projection (Zone 9). Elevation in
metres above mean sea level. Contour interval 100m.
IUGS
Classification
Mesonorm
vs CIPW
Q
60
DaciteRhyolite
> 63
Plutonic Rocks
ag
gd
g
Notes
tn
All isotopic dates are calculated using the decay constants
recommended by Steiger and Jäger (1977); recent estimates
of K decay constants would increase the 40 Ar/ 39Ar age by
ca. 1%.
20
aqs
Least altered
A
P
A
qs
qm
qmd/
qmg
qdi/
qgb
5
P
as
sy
mz
md/mg
di/gb
ag, alkali-feldspar granite; g, granite; gd, granodiorite; tn, tonalite; aqs,
alkali-feldspar qz syenite; qs, qz syenite; qm, qz monzonite; qmd/qmg,
qz monzodiorite/qz monzo-gabbro; qdi/qgb, qz diorite/qz gabbro; as,
alkali-feldspar syenite; sy, syenite; mz, monzonite; md/mg, monzodiorite/
monzogabbro; di/gb, diorite/gabbro
* High proportions of veinlets and/or amygdule fillings, or pervasive fine-grained alteration, commonly involving chlorite, epidote,
albite, calcite, quartz, sericite, prehnite, zeolites and clay minerals, and less commonly actinolite, potassium feldspar and pumpellyite.
TrJN
Glenlion
River Pluton
Quatse Lake
Pluton
Rupert Inlet
Pluton
Digital Cartography
G. T. Nixon
uTruKf
lmJHvs
uTruKf
JIqdi-gd
Magnetic
Declination
Base Map Information
Ross, K. V., Friedman, R. M., Dawson, K. M. and Leitch, C. H. B. (1996): U-Pb zircon ages of the Island
Copper deposit intrusions, northern Vancouver Island, British Columbia; Geological Survey of Canada,
Paper 1996-A, pages 111-117.
uKN
uTrP
Magnetic
North
Palfy, J., Mortensen, J. K., Smith, P. L., Friedman, R. M., McNicoll, V. and Villeneuve, M. (2000): New U-Pb
zircon ages integrated with ammonite biochronology from the Jurassic of the Canadian Cordillera;
Canadian Journal of Earth Sciences, Volume 37, pages 549-567.
Major Intrusions
Wanokana
Creek Pluton
uTrQ
TrJBvs?
91
Lyons
Point
lKL
uTrP
0
-1000
01
Lake
Middle Jurassic
TrJN
uTrQ
MINFILE locality (092L 052)
Topography
96
JIpo
uKBcg
92
600000E
Mineralization
Jeletzky, J. A. (1976): Mesozoic and ?Tertiary Rocks of Quatsino Sound, Vancouver Island, British Columbia;
Geological Survey of Canada, Bulletin 242, 243 pages.
PORT
HARDY
uKBcg
22
clae
Creek
96
metres
1500
33
Mahwh
ie
e
95
13
B
72
ek
Cre
di n
Creek
ia n
wu
ie
od
90
94
12
A
22
55
93
11
Retrograde zeolite mineral assemblages: Lm, laumontite (X-ray diffraction
determination by M. Chaudry)
Janousek, V., Farrow, C. M. and Erban, V. (2006): Interpretation of whole-rock geochemical data in igneous
petrology: introducing Geochemical Data Toolkit (GCDkit); Journal of Petrology, Volume 47, pages 1255-1259.
Severely altered *
10
Co
Sk i
91
610000E
95
26
93
92
Classification
SiO 2 wt %
15
Julian
Cove
Lm
Dark grey-green to pale pinkish grey, medium to coarse-grained, equigranular
granitoid rocks and porphyry; includes hornblende±biotite-bearing quartz
diorite (qdi), granodiorite (gd), plagioclase±hornblende porphyry (po) and
quartz-plagioclase±biotite porphyry (qpo); combined codes indicate a range
of common rock types (qdi-gd, quartz diorite - granodiorite)
Haggart, J. W. and Tipper, H. W. (1994): New results in Jura-Cretaceous stratigraphy, northern Vancouver
Island, British Columbia; Geological Survey of Canada, Paper 1994-E, pages 59-66.
Bergh Cove conglomerate: grey-green to brownish grey, massive to thinly bedded,
heterolithic pebble and cobble conglomerate; moderately well to poorly sorted;
framework and matrix-supported volcanic and sedimentary clasts
Alkali metasomatized
14
J ul
09
33
Kultus
Cove
08
13
15
Pender
Point
Prehnite-pumpellyite facies mainly: pumpellyite±prehnite+chlorite+albite
±epidote±quartz±calcite
Greene, A. R., Scoates, J. S., Weis, D., Katvala, E. C., Israel, S. and Nixon, G. T. (2010): The architecture of
oceanic plateaus revealed by the volcanic stratigraphy of the accreted Wrangellia oceanic plateau; Geosphere,
Volume 6, pages 47-73.
Dark grey-green, plagioclase-megacrystic basaltic to andesitic pillowed
flows; texturally similar to unit lJLx
Volcanic Rocks
20
07
22
90
Banter
Point
Bland
Island
47
Atkins
Cove
70
82
33
47
22
73
Upper greenschist facies: actinolite+chlorite+albite±epidote±quartz
±calcite
35
40
45
97
35
Geochronology
Metamorphism
Steiger, R. H. and Jäger, E. (1977): Subcommission on geochronology: convention on the use of decay constants
in geo- and cosmochronology; Earth and Planetary Science Letters, Volume 6, pages 359-362.
k
38
(P) Primitius
K/Ar date (Ma, 2 sigma error); WR, whole-rock
(Breitsprecher and Mortensen, 2004)
Dark grey-green, closely packed, pillowed basalt flows and localized, massive
inflated flow lobes; typically aphanitic and non-amygdaloidal; may include
inter-pillow or rare thin lenses of well-bedded hyaloclastite
Breitsprecher, K. and Mortensen, J. K. (2004): BCAge 2004A-1: a database of isotopic age determinations
for rock units from British Columbia; BC Ministry of Energy and Mines, Open File 2004-3 (Release 3.0).
98
24
Early
Bird
Cove
47
Conodont Zone:
date (Ma, 2 sigma error); Hb, hornblende; Bi, biotite;
Pl, plagioclase; Kf, K-feldspar (determined by D. A. Archibald)
Selected References
WHOLE-ROCK GEOCHEMISTRY LEGEND
ee
(K) Kerri; (C) Cordilleranus;
4.3 (±0.8) WR
45
40
sta
Ammonite Zone:
44
40
Kw
TrJBcg
H Hauterivian; B Barremian
40Ar/ 39Ar
Dark grey-green, clinopyroxene-plagioclase±olivine porphyry coeval with
mineralogically similar lavas in the lower part of the Bonanza Group
(units uTrPfvmc/uTrPvfmc/uTrPfmc)
99
Riv
er
Quattische
Island
30
Pamphlet
Cove
51
60
44
Evenson
Point
98
42
Keo
gh
Sara
Lake
80
36
Bergh Cove
Sherberg
Jesdal
Islands
Islet
35
5600000N
40
40
36
01
Cretaceous:
160 (±1.4) Kf
Dark grey-green, plagioclase-megacrystic basaltic dike/sill coeval with
texturally similar lavas (lJLx) in the Le Mare Lake volcanic unit
Interbedded volcaniclastic and sedimentary strata (predominantly submarine):
buff to grey-green, thin to very thickly bedded, calcareous to non-calcareous, volcanic
breccia, lithic and feldspathic wacke, siltstone and limestone, locally coralline; lithiccrystal tuff, lapilli tuff and reworked equivalents; and minor vitric tuff, pebbly sandstone,
siltstone, and volcaniclastic debris-flow deposits; may include black carbonaceous
shale, mudstone, siltstone and limestone (locally coralline) equivalent to unit TrJY in
the Mahatta - Alice Lake area (Geoscience Maps 2011-3 and 2011-4)
TrJBvs
55
44
Hecate
Cove
Cr
Cr
5600000N
Aw
eis
h
40
47
k
Cree
Lak
e
Makwazniht
Island
Dark grey-green, massive to medium bedded, basaltic hyaloclastite breccia,
including pillow-fragment breccia, and medium bedded to laminated hyaloclastite
sandstone; may locally pass laterally into pillowed basalt flows
Minor Intrusions
LATE TRIASSIC TO EARLY JURASSIC
VOLCANICLASTIC-SEDIMENTARY UNIT
02
S Sinemurian; P Pliensbachian
U-Pb zircon date (Ma, 2 sigma error; Ross et al., 1996;
Palfy et al., 2000)
52
Upper Triassic (Rhaetian) to possibly Lower Jurassic (Hettangian)
ls
Mil
eek
Cr
01
95
JI
Dark grey-green, variably amygdaloidal, basaltic to andesitic volcaniclastic
breccias and minor flows; generally aphanitic
lJLvf
27
Kenny
Point
Sorenson
Point
42
35
35
25
36
33
03
63
42
02
aas
27
40
38
lJLpx
Jurassic:
U-Pb zircon date (Ma, 2 sigma error; determined by R. M. Friedman)
MIDDLE JURASSIC (ca. 174.7 to 166.2 Ma)
ISLAND PLUTONIC SUITE
ukw
Co
lon
y
eek
Cr
03
04
us
Wa
27
28
166.9 (±0.5) Zr
INTRUSIVE ROCKS
Small outcrop of plagioclase-megacrystic basaltic to andesitic flows
of unit lJLx
37
04
92
R upe r t
65
45
24
5
C Carnian; N Norian; R Rhaetian
Hornblende hornfels facies: hornblende+plagioclase±epidote±quartz
Dark grey-green, plagioclase-megacrystic (0.8-2cm), variably amygdaloidal
basaltic to andesitic flows; locally intercalated with aphanitic and plagioclasephyric flows; texturally similar to plagioclase-megacrystic Karmutsen basalt
in units uTruKf/uTruKpx
25
35
43
96
uTrlKp
Medium grey, rhyolitic to dacitic flows, flow domes and/or pyroclastic rocks,
including flow and pyroclastic breccias, welded to non-welded crystal-lithic
lapilli tuff and rare airfall tuff; aphanitic to feldspar-phyric; locally may include
thin sedimentary deposits, high-silica andesite and minor basaltic flows
lJLf
Late Triassic:
(no label indicates age indeterminate;
combined codes indicate age/zone range)
Lower Karmutsen Formation: Pillow Member
06
Stewart
Point
97
uTrmKh
Dark grey-green, basaltic to andesitic flows with minor intercalated volcaniclastic and sedimentary lithotypes similar to unit TrJBvs; locally includes minor
pillow lava/breccia; may include minor rhyolitic flows and pyroclastic rocks
35
06
uTruKls
Middle Karmutsen Formation: Hyaloclastite Member
Similar lithologies to those found south of the Holberg Fault; coarser sedimentary
and volcaniclastic deposits appear to be less common and Sutton limestone
equivalent has not been observed
18
10
Dark grey-green volcaniclastic and sedimentary rocks including basaltic
to andesitic, plagioclase-clinopyroxene and plagioclase-hornblende-phyric
lapilli tuff and tuff breccia, volcanic breccia, wacke and minor siltstone
and mudstone; locally includes basaltic to andesitic flows
LE MARE LAKE VOLCANIC UNIT
08
10
28
e early; m middle; l late
168.5 (±0.6) Zr
Lower Jurassic (Hettangian to Upper Sinemurian)
Misty
Lake
21
Apple Bay
70
T Late Triassic; J Jurassic; K Cretaceous
Thin (0.5-5m) beds and lenses of inter-volcanic limestone of unit uTruKls
BONANZA GROUP - SOUTH OF HOLBERG FAULT
44
k
ee
Cr
Washlawlis
33
Lady Ellen
Point
GSC Radiolarian locality (fossil age code below; identification by
F. Cordey)
A Aalenian
Pale to medium grey, micritic to rarely bioclastic or oolitic limestone
intercalated with basalt near the top of the flow succession
PARSON BAY FORMATION
uTrP
GSC Conodont locality (fossil age code below; identification by
M. J. Orchard)
Fossil age designation
Plagioclase-megacrystic (<2cm) pillowed basalt flows
Upper Triassic (Carnian to Rhaetian)
Dickenson
Point
er
55
26
07
50
iv
34
17
71
Medium grey to grey-green, aphanitic to feldspar-phyric, rhyolitic to dacitic
flows, flow domes and/or pyroclastic rocks including flow and pyroclastic
breccia, welded to non-welded crystal-lithic lapilli tuff with carbonized wood
fragments; may locally include thin interbedded volcanic breccia and wacke,
and minor basaltic to andesitic flows
Dark grey to grey-green, medium bedded to thinly laminated, siliceous siltstone,
mudstone and feldspathic lithic wacke; locally contains massive beds of basaltic
to andesitic volcaniclastic breccia and thin, rhyolitic tuff beds
TrJN
09
87
Stephens
20
Pulteney
Point
55
75
10
Cr e
k
Cr
ee
Nuknimish
11
k
re e
28
30
60
35
28
43
h
al i s
W ak
08
R
35
20
ek
Cre
44
36
55
J
uTruKpx
NAHWITTI RIVER SILTSTONE-WACKE
40
34
30
Mainly dark grey-green to medium grey, basaltic to andesitic flows and
volcaniclastic rocks including plagioclase-hornblende-phyric andesite,
plagioclase-clinopyroxene-phyric basalt-andesite with sparse hornblende
megacrysts (~1cm), tuff-breccia, lapilli tuff and reworked equivalents; minor
sedimentary rocks including volcanic breccia, wacke, siltstone, mudstone
and shale; locally may include minor rhyolitic flows and tuffs
GSC Macrofossil locality (fossil age code below)
Conodont locality (fossil age code below; identification by M. J. Orchard)
TeN
Dark grey-green, closely packed, pillowed basalt flows; aphanitic
and variably amygdaloidal
uTruKp
Upper Triassic (Norian) to Lower Jurassic (Sinemurian or younger)
Graeme
Point
5610000N
5610000N
31
24
35
gh
85
er
24
70
Single Tree
Point
uas h
50
64
eo
C
Riv
TC
Small outcrop of plagioclase-megacrystic (1-2cm) basalt flow; commonly
amygdaloidal and locally exhibiting trachytoid texture; intercalated with
aphanitic or plagioclase-phyric basalt near the top of the succession
12
K
S uq
Blue
e
uTruKf
33
37
ek
Cre
Q u a ts
19
38
39
74
66
lmJHvs
Macrofossil locality (fossil age code below; identification by E. T. Tozer)
TlC(W)
36
40
11
Fossils
Dark grey-green, aphanitic to plagioclase-phyric basalt flows, commonly
amygdaloidal and locally exhibiting laminar flow features (vesicle trains)
and pipe vesicles; may include minor pillow lava and hyaloclastite
Poorly exposed, undivided basaltic to rhyolitic flows, volcaniclastic and
sedimentary rocks east of Rupert Inlet
mJHm
Lineation, inclined (slickenfibres on steeply dipping fault)
KARMUTSEN FORMATION
44
26
Axial plane of minor fold, inclined
17
TIN
Upper Triassic (Carnian; possibly Middle Triassic (Ladinian) at the base)
HOLBERG VOLCANIC UNIT
16
Axis of minor fold, inclined
17
Lineation, horizontal (slickenfibres on steeply dipping fault)
Medium to pale grey, thinly bedded to massive micritic limestone and locally
bioclastic limestone; minor silica replacement and chert nodules; rare
laminated interbeds, oolitic layers and algal structures; locally fossiliferous
uTrQ
Greenish to brownish grey, thinly bedded to massive sandstone, siltstone,
mudstone, pebble conglomerate and minor coal; locally fossiliferous
lmJH
27
QUATSINO FORMATION
UPPER TRIASSIC TO MIDDLE JURASSIC
BONANZA GROUP - NORTH OF HOLBERG FAULT
Lower (?Hettangian) to Middle (Bajocian) Jurassic
17
Creek
D
Creek
Creek
Booth
15
Boyden
ese
h -w
48
34
Wa
30
76
25
Dike, inclined, vertical
64
Upper Karmutsen Formation: Flow Member
20
Volcanic flow lamination, inclined
30
UPPER TRIASSIC
VANCOUVER GROUP
Upper Triassic (Carnian to Lower Norian)
69
86
45
Bedding, inclined
14
LONGARM FORMATION EQUIVALENTS
lKL
Thomas
Point
17
Structure
30
Dark grey to grey-green, aphanitic to plagioclase-clinopyroxene-phyric tuff-breccia
and lapilli tuff interbedded with thinly bedded to laminated impure limestone, siltstone,
wacke and debris-flow deposits with volcanic and sedimentary clasts including poorly
consolidated limestone; minor basaltic flows
uTrPvs
Lower conglomerate unit: massive conglomerate with minor lenses
of coarse-grained lithic wacke
lKCcg
19
Eagle
Island
45
31
Outcrop too small to show at map scale
Tertiary dike, inclined, vertical, attitude unknown
Upper Valanginian to Barremian
Shell
Island
17
28
Round
Island
Deer
Island
Cattle
Islands
Line of vertical cross-section
Outcrop examined
Small outcrop of clinopyroxene-megacrystic basalt flow
Upper sandstone unit: trough cross-laminated lithic wacke intercalated
with siltstone, minor pebble conglomerate and rare coal
lKCsn
5620000N
ulq
Ts
at e
C
Eutaxitic foliation/welding, inclined
LOWER CRETACEOUS
21
30
Unconformity, approximate
64
?Albian
River
Steeply dipping fault, inferred
Dark grey-green to reddish grey, coarsely plagioclase-clinopyroxene-phyric
and clinopyroxene megacrystic(<1.5cm) basalt flow and flow breccia
uTrPfmc
COAL HARBOUR GROUP
7
26
21
Steeply dipping fault, approximate
A
41
Creek
Jenkinson
22
Charlie
Islands
40
Steeply dipping fault, defined
Dark grey-green, aphanitic to plagioclase-phyric basaltic to andesitic
volcaniclastic breccia and flows
Dark grey, calcareous to non-calcareous siltstone and impure limestone
interbedded with subordinate wacke and minor pebble conglomerate
(exposure restricted to the north shore of Quatsino Sound)
uKs
26
16
Geological contact, inferred
Unconformity, inferred
SHALE UNIT
Dillon
Point
33
uTrPvfmc
Dark grey-green, basaltic tuff-breccia, crystal-lithic lapilli tuff and
lesser flows; coarsely clinopyroxene-plagioclase-phyric
uTrPvfm
Cenomanian to ?Turonian
22
uTrPfvmc
Dark grey-green to maroon, coarsely clinopyroxene-plagioclase-phyric and
clinopyroxene-megacrystic basaltic flows and lesser volcaniclastic breccia
and crystal-lithic lapilli tuff; minor tuffaceous wacke and siltstone
24
23
Geological contact, approximate
BLUMBERG FORMATION
Masterman
Islands
Songhees
Grey to greenish grey and brown, medium to coarse-grained, arkosic to
lithic wacke, pebble to cobble conglomerate, siltstone and minor coal;
locally fossiliferous
Geological contact, defined
Medium grey to black, thinly laminated to medium bedded, impure limestone, calcareous to
non-calcareous mudstone, siltstone and shale intercalated with variable proportions of greygreen lithic feldspathic/tuffaceous wacke, minor crystal-lithic tuff and reworked equivalents,
volcaniclastic breccia and debris-flow deposits, and rare vitric tuff, pebbly sandstone and
conglomerate; shale locally yields abundant thin-shelled bivalves (Halobia sp., Monotis sp.);
limestone locally contains rare algal structures; may include coralline limestone near the top
of the succession equivalent in part to Sutton limestone in the Cowichan Lake area, southern
Vancouver Island
uTrP
Cenomanian or Lower Turonian to ?Santonian
Lake
40
Dark to pale grey, basalt to rhyolite flows, flow domes and volcanic breccia;
aphanitic to porphyritic; minor interbedded sedimentary rocks including
volcanic conglomerate, sandstone, siltstone, and debris-flow deposits
QUEEN CHARLOTTE GROUP EQUIVALENTS (IN PART)
640000E
34
PARSON BAY FORMATION
37
Islands
25
24
ALERT BAY VOLCANIC UNIT
uKN
Duval
Point
Duval Island
s
So nghe e
Upper Triassic (Carnian to Rhaetian)
UPPER CRETACEOUS
NANAIMO GROUP EQUIVALENTS (IN PART)
Campanian to ?Maastrichtian
35
26
Neogene
TAv
34
MAP SYMBOLS
BONANZA GROUP - SOUTH OF HOLBERG FAULT (Cont'd)
Peninsula
kilometres
33
Mier Point
Olympic
200
LAYERED ROCKS (Cont'd)
TERTIARY
Victoria
29
4
Scale 1:50 000
Vancouver
Port Alberni
GEOCHRONOLOGY
by
R.M. FRIEDMAN (The University of British Columbia)
D.A. ARCHIBALD (Queen's University)
kilometres
Columbia
Vancouver
Island
25
Doyle
Creek
2
British
24
Island
27
0
Campbell River
23
Island
Quatsino - Port McNeill Area
(92L/11 & parts of
92L/05, 12 & 13)
GEOLOGY
by
G.T. NIXON, J.L. HAMMACK, V.M. KOYANAGI,
G.J. PAYIE, A. J. ORR (BC Geological Survey)
J.W. HAGGART (Geological Survey of Canada)
Grid North
37
92
uTruKf
uTruKf
uTruKf
Acknowledgments
We sincerely appreciate the warm hospitality shown to us by
the residents of northern Vancouver Island. We thank Margaret
Hanuse and Dave Ross for accommodations in Port McNeill
and Holberg, respectively. John Fleming, BHP-Utah Mines Ltd.,
kindly granted access to maps, drill logs and core from the Island
Copper Mine and other properties. Western Forest Products Inc.
provided maps and digital files of logging roads in the area. Critical
reviews by L. J. Diakow, N. W. D. Massey, J. L. Nelson and P.
Schiarizza greatly improved the final cartographic product. Sadly,
one of our co-authors, Dr. E. T. Tozer of the Geological Survey of
Canada, passed away recently; his contributions to invertebrate
palaeontology will be sorely missed.
uTrP
A
P
CIPW (wt %) normative compositions projected in QAP: Q (qz), A (Or) and P (Ab+An) taking Fe2O3 as 0.15FeOt (total Fe as FeO). Grey diamonds fall in
the extension of the Wanokana Creek Pluton in the Holberg-Winter Harbour area (Geoscience Map 2011-1). Nomenclature of plutonic rocks on the map is
based on the IUGS modal QAP mineralogical classification. Any discrepancy between modal and CIPW rock nomenclature is due in part to the projection
scheme. The CIPW projection of least altered plutonic rocks (n=96; grey/black dots) yields an overabundance of Or in the norm due to the presence of
K-bearing mafic hydrous minerals (biotite, hornblende) relative to the mesonorm (red crosses); the latter produces a bias towards tonalite in the granitoid
rocks (not a common rock type) whereas the CIPW projection shows bias towards quartz monzodiorite (much less common than quartz diorite).
Data Compilation
G. T. Nixon, K. A. Johnston,
M. C. Kelman and R. D. M. Rayner
Recommended Citation
Nixon, G. T., Hammack, J.L., Koyanagi, V.M., Payie, G.J., Orr, A.J.,
Haggart, J.W., Orchard, M.J., Tozer, E.T., Friedman, R. M., Archibald,
D. A., Palfy, J., and Cordey, F. (2011): Geology, geochronology,
lithogeochemistry and metamorphism of the Quatsino-Port McNeill
area, northern Vancouver Island; BC Ministry of Energy and Mines,
Geoscience Map 2011-2, 1:50 000 scale.