Basement Lithologic Framework and Structural Features of the
... rocks are part of, or intrude, the Careen Lake Group. All these are cut by peraluminous granites. In contrast, the Careen Lake Group in the Carswell Structure is dominated by psammopelites and migmatitic to diatexitic pelites, with subordinate psammites and quartzites. It is intruded by granodiorite ...
... rocks are part of, or intrude, the Careen Lake Group. All these are cut by peraluminous granites. In contrast, the Careen Lake Group in the Carswell Structure is dominated by psammopelites and migmatitic to diatexitic pelites, with subordinate psammites and quartzites. It is intruded by granodiorite ...
Opening and closure of an island arc
... sediments has been determined as recycled components from orogens, prevalently from the cratonic area to the north-east. They were transported and deposited mostly by turbidity currents. Folding is manifold, from a simple singural deformation up to three or four stages of refolding (Willner, 1990). ...
... sediments has been determined as recycled components from orogens, prevalently from the cratonic area to the north-east. They were transported and deposited mostly by turbidity currents. Folding is manifold, from a simple singural deformation up to three or four stages of refolding (Willner, 1990). ...
CJ LISSENBERG AND CR van STAAL
... of numerous narrow mylonitic shear zones exposed on the islands and shore lines of Star Lake immediately to the south of this boundary as mapped by Whalen (1993a, Figure 1); this inferred fault zone is here informally named the Star Lake shear zone (SLSZ); the anastomosing narrow mylonite zones expo ...
... of numerous narrow mylonitic shear zones exposed on the islands and shore lines of Star Lake immediately to the south of this boundary as mapped by Whalen (1993a, Figure 1); this inferred fault zone is here informally named the Star Lake shear zone (SLSZ); the anastomosing narrow mylonite zones expo ...
Physical Volcanology, Hydrothermal Alteration and Massive
... Gneiss Belt (Trowell and Johns, 1986). The volcanic and sedimentary rocks of the area have been subjected to regional greenschist facies metamorphism with almandineamphibolite assemblages found locally (Trowell, 1974). Detailed mapping of the volcanic rocks in the south Sturgeon Lake area coupled wi ...
... Gneiss Belt (Trowell and Johns, 1986). The volcanic and sedimentary rocks of the area have been subjected to regional greenschist facies metamorphism with almandineamphibolite assemblages found locally (Trowell, 1974). Detailed mapping of the volcanic rocks in the south Sturgeon Lake area coupled wi ...
GEOLOGICAL STUDIES AND DEFINITION OF THE TALLY POND
... al., 2001). The mineralization is largely restricted to the fel- ...
... al., 2001). The mineralization is largely restricted to the fel- ...
Update and economic significance of geological mapping in the
... ferruginous argillite (subunit 2c). Uranium-lead analyses of zircons from a sample of relatively coarse plagioclasephyric tuff indicate that emplacement most likely occurred between ca. 2883 and 2898 Ma (Anderson, unpublished data, 2003). Geochemically, these rocks exhibit an affinity to modern calca ...
... ferruginous argillite (subunit 2c). Uranium-lead analyses of zircons from a sample of relatively coarse plagioclasephyric tuff indicate that emplacement most likely occurred between ca. 2883 and 2898 Ma (Anderson, unpublished data, 2003). Geochemically, these rocks exhibit an affinity to modern calca ...
IOCG and Porphyry-Cu deposits in Northern
... greenstone belts The Palaeoproterozoic Lapland Greenstone Belt, which overlies much of the northern part of the Archaean craton, is the largest coherent greenstone terrain exposed in the Fennoscandian Shield (Fig. 1). It extends for over 500 km from the Norwegian northwest coast through the Swedish ...
... greenstone belts The Palaeoproterozoic Lapland Greenstone Belt, which overlies much of the northern part of the Archaean craton, is the largest coherent greenstone terrain exposed in the Fennoscandian Shield (Fig. 1). It extends for over 500 km from the Norwegian northwest coast through the Swedish ...
here - Eric Twelker
... kilometer footwall rocks grade from intensely deformed phyllites to volcanics rocks with primary features such as pillows. •At the ore zone, intense foliation gives way to deformation that appears to be soft sediment with delicate depositional textures preserved. Deformation decreases up-section giv ...
... kilometer footwall rocks grade from intensely deformed phyllites to volcanics rocks with primary features such as pillows. •At the ore zone, intense foliation gives way to deformation that appears to be soft sediment with delicate depositional textures preserved. Deformation decreases up-section giv ...
Stratigraphic and structural setting of gold mineralization in the Lily
... et al. (1986), with high-field-strength-element signatures indicative of extension-related, within-plate volcanism (Anderson, 2005). The vent complex is overlain by a thick, possibly rift-fill succession of heterolithic volcaniclastic rocks that includes minor flow-banded to massive dacite and rhyolite ...
... et al. (1986), with high-field-strength-element signatures indicative of extension-related, within-plate volcanism (Anderson, 2005). The vent complex is overlain by a thick, possibly rift-fill succession of heterolithic volcaniclastic rocks that includes minor flow-banded to massive dacite and rhyolite ...
The geology of an area of approximately 500 km2, which covers
... Lake. Fragments tend to be more monomictic in the lapilli tuf f s and tuff breccias compared to the heterolithic nature of fragments in coarse volcanic breccias. East of Dicus Lake (Sheet 2, in map pocket), mafic volcanic rocks include black-weathering, finely laminated and well-foliated ash tuffs, ...
... Lake. Fragments tend to be more monomictic in the lapilli tuf f s and tuff breccias compared to the heterolithic nature of fragments in coarse volcanic breccias. East of Dicus Lake (Sheet 2, in map pocket), mafic volcanic rocks include black-weathering, finely laminated and well-foliated ash tuffs, ...
CHAPTER 4 DISCUSSION
... are mainly distributed in the area and consist of diorite, granodiorite, granite and granitic syenite porphyry. Andesitic porphyry dykes intruded in the granitic rocks. Main fault directions are NE-SW, NW-ESE and EW. Alterations related to mineralization consist of sericite-chlorite alteration and c ...
... are mainly distributed in the area and consist of diorite, granodiorite, granite and granitic syenite porphyry. Andesitic porphyry dykes intruded in the granitic rocks. Main fault directions are NE-SW, NW-ESE and EW. Alterations related to mineralization consist of sericite-chlorite alteration and c ...
Structural Geology, Holloway Mine, Abitibi
... trending mineralized zones. In 1923, several diamond drill holes were drilled to test the horizon at depth but intersected only narrow zones of alteration with poor grades. Further investigation into the claim was abandoned. These holes stopped only metres short of intersecting Holloway’s main “Ligh ...
... trending mineralized zones. In 1923, several diamond drill holes were drilled to test the horizon at depth but intersected only narrow zones of alteration with poor grades. Further investigation into the claim was abandoned. These holes stopped only metres short of intersecting Holloway’s main “Ligh ...
Uranium Transport and Deposition and Uranium Deposits
... The Kitts-Post Hill Belt contains the rocks of the Post Hill Group Uranium mineralization is found throughout the belt adjacent to major dissecting shear zones ...
... The Kitts-Post Hill Belt contains the rocks of the Post Hill Group Uranium mineralization is found throughout the belt adjacent to major dissecting shear zones ...
Geology of the Alberts Lake Area (NTS 64K13SE and 14SW
... aphyric basalt in the southwest part of the map area, close to the contact with gabbro (10). Most of these units are interpreted as diabase sills (9e), but pillowed plagioclase-phyric basalt and related breccia (4a) also occur at that locality. One unit is megaphyric, with localized concentrations o ...
... aphyric basalt in the southwest part of the map area, close to the contact with gabbro (10). Most of these units are interpreted as diabase sills (9e), but pillowed plagioclase-phyric basalt and related breccia (4a) also occur at that locality. One unit is megaphyric, with localized concentrations o ...
Geology and geochemistry of Paleoproterozoic volcanic rocks
... (0.5-2mm) and 0 to 5% pyroxene (1-4mm) (pseudomorphed by amphibole) phenocrysts. They contain up to 10% quartz amygdales and are locally epidotized. The Three zone basalts form a 300m thick unit that directly underlies the Birch Lake basalt. These basalts are dominantly massive, with up to 50% pyrox ...
... (0.5-2mm) and 0 to 5% pyroxene (1-4mm) (pseudomorphed by amphibole) phenocrysts. They contain up to 10% quartz amygdales and are locally epidotized. The Three zone basalts form a 300m thick unit that directly underlies the Birch Lake basalt. These basalts are dominantly massive, with up to 50% pyrox ...
Preliminary Geochemical Analysis of Various Gold Occurrences
... deposited in a deep water environment, interbedded with minor mafic, felsic volcanic units, and coarser clastic and volcaniclastic units. The volcanic units are interpreted to have been emplaced in or near an expanding back-arc basin that may have developed some oceanic crust. The top photo shows th ...
... deposited in a deep water environment, interbedded with minor mafic, felsic volcanic units, and coarser clastic and volcaniclastic units. The volcanic units are interpreted to have been emplaced in or near an expanding back-arc basin that may have developed some oceanic crust. The top photo shows th ...
L - Saskatchewan Publications Centre
... complex, that is overlain to the south by flat-lying Phanerozoic rocks and grades northward into the Kisseynew Gneiss Belt. Excellent reviews of the geology of the belt are presented by Bailes et al. (1987), Syme et al. (1982) and Bailes (1971). The geology of the Amisk - Flin Flan region, in which ...
... complex, that is overlain to the south by flat-lying Phanerozoic rocks and grades northward into the Kisseynew Gneiss Belt. Excellent reviews of the geology of the belt are presented by Bailes et al. (1987), Syme et al. (1982) and Bailes (1971). The geology of the Amisk - Flin Flan region, in which ...
J.G. Hinchey and V. McNicoll - Department of Natural Resources
... graphic’ division of ca. 511 Ma, fine-grained to aphyric, rhyolite and felsic tuffs that host the Long Lake VMS deposit and have high concentrations of high-field strength and rare-earth elements, and 2) an ‘upper stratigraphic’ division of ca. 506 Ma blue-quartz-phyric felsic to intermediate tuff h ...
... graphic’ division of ca. 511 Ma, fine-grained to aphyric, rhyolite and felsic tuffs that host the Long Lake VMS deposit and have high concentrations of high-field strength and rare-earth elements, and 2) an ‘upper stratigraphic’ division of ca. 506 Ma blue-quartz-phyric felsic to intermediate tuff h ...
GS-14
... Folds are mostly isoclinal or tight. The few close folds that are present have orientations similar to the tight to isoclinal folds. Overprinting relationships were not found. Therefore, the two types of folds may be the same generation. Sheath folds were found along Little Assean Lake and in the so ...
... Folds are mostly isoclinal or tight. The few close folds that are present have orientations similar to the tight to isoclinal folds. Overprinting relationships were not found. Therefore, the two types of folds may be the same generation. Sheath folds were found along Little Assean Lake and in the so ...
Geology of the West Troms Basement Complex, northern Norway
... the Sveco karelian shear ing. Since the quartz diorite on southern Senja -- containin g dolerite dyke swarms (Landmark 1973) -- is 1746 Ma old, the dolerites on Senja are unrelated to, and younger than those on Rinqvass eya. The Senja Shear Belt (SSB) is defined by air photo and satellite imagery in ...
... the Sveco karelian shear ing. Since the quartz diorite on southern Senja -- containin g dolerite dyke swarms (Landmark 1973) -- is 1746 Ma old, the dolerites on Senja are unrelated to, and younger than those on Rinqvass eya. The Senja Shear Belt (SSB) is defined by air photo and satellite imagery in ...
Short Course on Subaqueous Volcanic Rocks, Hydrothermal
... In the Vermilion District of northeastern Minnesota, a Neoarchean, mafic-intermediate, lava flow-dominated submarine volcanic sequence will be studied. Geological studies suggest that this succession is representive of a submarine succession deposited in increasingly deeper water during the transiti ...
... In the Vermilion District of northeastern Minnesota, a Neoarchean, mafic-intermediate, lava flow-dominated submarine volcanic sequence will be studied. Geological studies suggest that this succession is representive of a submarine succession deposited in increasingly deeper water during the transiti ...
GRANOPHILE METAL DEPOSITS - Department of Natural Resources
... The Central Mineral Belt hosts several distinct mineralization environments in a wide range of rocks types and age that form geographically distinct belts, including: i) volcanic-hosted, stratabound mineralization (possibly syngenetic) in rhyolitic ash-flow tuffs, e.g., Michelin and Burnt Lake depos ...
... The Central Mineral Belt hosts several distinct mineralization environments in a wide range of rocks types and age that form geographically distinct belts, including: i) volcanic-hosted, stratabound mineralization (possibly syngenetic) in rhyolitic ash-flow tuffs, e.g., Michelin and Burnt Lake depos ...
Regional alteration systems associated with Snow Lake VMS
... VMS-prospective domains along the semi-concordant zones? (3) What is the spatial relationship between alteration, subvolcanic intrusions, and VMS deposits? (4) Are the VMS deposits and their footwall alteration ‘pipes’ produced by the same hydrothermal event as that responsible for the semi-concorda ...
... VMS-prospective domains along the semi-concordant zones? (3) What is the spatial relationship between alteration, subvolcanic intrusions, and VMS deposits? (4) Are the VMS deposits and their footwall alteration ‘pipes’ produced by the same hydrothermal event as that responsible for the semi-concorda ...
Platinum Group Element Investigations in the Flin Flon Greenstone
... epidote alteration was observed in outcrops directly north of the McBratney Lake PGE-Au occurrence. In these exposures, the pillowed basalt consists of a contorted mass of lensoid epidosite and quartz domains (Fig. GS-11-3). Bailes and Syme (1989) observed a positive correlation between the intensi ...
... epidote alteration was observed in outcrops directly north of the McBratney Lake PGE-Au occurrence. In these exposures, the pillowed basalt consists of a contorted mass of lensoid epidosite and quartz domains (Fig. GS-11-3). Bailes and Syme (1989) observed a positive correlation between the intensi ...
126_2013_475_MOESM1_ESM - Springer Static Content Server
... 30m. Seven gold-bearing quartz veins occur within these three alteration zones. The gold-bearing quartz veins occur as en echelon or lenses (Fig. 9B). The largest ...
... 30m. Seven gold-bearing quartz veins occur within these three alteration zones. The gold-bearing quartz veins occur as en echelon or lenses (Fig. 9B). The largest ...
Temagami Greenstone Belt
The Temagami Greenstone Belt (TGB) is a small 2.7 billion year old greenstone belt in the Temagami region of Northeastern Ontario, Canada. It represents a feature of the Superior craton, an ancient and stable part of the Earth's lithosphere that forms the core of the North American continent and Canadian Shield. The belt is composed of metamorphosed volcanic rocks that range in composition from basalt to rhyolite. These form the east-northeast trend of the belt and are overlain by metamorphosed sedimentary rocks. They were created during several volcanic episodes involving a variety of eruptive styles ranging from passive lava eruptions to viscous explosive eruptions.Part of the Canadian Shield, the Temagami Greenstone Belt contains some of the oldest known rocks on Earth. The belt is made up of a number of geologic features such as batholiths, stocks, dikes, volcanic complexes, layered intrusions and deformation zones. These are situated in several geographical townships in the municipality of Temagami, including Chambers, Strathy, Strathcona, Briggs and possibly Best.