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TitlePrecambrian geology, Leith Peninsula-Rivière Grandin area, Northwest Territories
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorHildebrand, R S
SourceGeological Survey of Canada, Canadian Geoscience Map 153, 2017, 1 sheet, Open Access logo Open Access
PublisherNatural Resources Canada
Maps1 map
Map Info.geological, bedrock geology, 1:125,000
ProjectionUniversal Transverse Mercator Projection, UTM zone 11 (NAD83)
Mediaon-line; digital
RelatedNRCan photo(s) in this publication
File formatreadme
File formatpdf (Adobe® Reader®); rtf; gdb (ESRI® ArcGIS(TM) 10.x); shp (ESRI® ArcGIS(TM) 10.x); xml (ESRI® ArcGIS(TM) 10.x); mxd (ESRI® ArcGIS(TM) 10.x)
ProvinceNorthwest Territories
NTS86D/09; 86D/10; 86D/13; 86D/14; 86D/15; 86D/16; 86E/01; 86E/02; 86E/03; 86E/04; 86E/05; 86E/06; 86E/07; 86E/08; 86E/09; 86E/10; 86E/11; 86E/12; 86E/15; 86E/16
AreaLeith Peninsula; Rivière Grandin; Hottah Lake; Great Bear Lake; McTavish Arm; Camsell River
Lat/Long WENS-119.5167 -118.0000 66.0000 64.5833
Subjectsregional geology; structural geology; stratigraphy; tectonics; bedrock geology; basement geology; lithology; igneous rocks; plutonic rocks; diorites; granodiorites; granites; monzonites; gabbros; monzo-granites; volcanic rocks; rhyolites; basalts; dacites; volcanic ash; tuffs; lavas; mylonites; andesites; metasedimentary rocks; sedimentary rocks; sandstones; conglomerates; arenites; siltstones; metamorphic rocks; stockworks; porphyries; ignimbrites; structural features; faults; folds; lineations; unconformities; structural interpretations; tectonic elements; tectonic interpretations; deformation; foliation; metamorphism; intrusions; diabase dykes; plutons; sills; brecciation; silicification; Canadian Shield; Wopmay Orogen; Hottah Terrane; Slave Craton; Calderian Orogeny; Old Fort Island Formation; Conjuror Bay Formation; Beaverlodge Lake Sandstone; Hornby Bay Group; Great Bear Magmatic Zone; MacTavish Supergroup; LaBine Group; Bell Island Bay Group; Zebulon Formation; Asiak Fold-Thrust Belt; Turmoil Klippe; Muskox Intrusion; Coronation Sill; Gunbarrel Sill; Dismal Lakes Group; Coppermine River Group; Rae Group; Hepburn Batholith; Akaitcho Group; Odjick Formation; Rocknest Formation; Cleaver Dykes; Longtom Lake Pluton; Richardson Pluton; Tla Pluton; Yen Pluton; Mile Lake Pluton; Balachey Pluton; Rainy Lake Intrusive Complex; Camsell River Formation; Black Bear Caldera Complex; Terra Formation; Animal Andesite; White Eagle Tuff; Echo Bay Andesite; Moose Bay Tuff; Phanerozoic; Paleozoic; Precambrian; Proterozoic
Illustrationslocation maps; index maps; geoscientific sketch maps; photographs
ProgramGEM2: Geo-mapping for Energy and Minerals GEM Coordination
Released2017 12 22
AbstractThe Leith Peninsula map area lies along the western margin of the Canadian Shield (Kidd, 1936a) and is dominated by Paleoproterozoic rocks of Wopmay Orogen (Hoffman, 1980, 1989). The oldest rocks, termed Hottah terrane (Hildebrand, 1981), constitute the metamorphic basement to volcanic, plutonic, and sedimentary rocks of the 1.875-1.843 Ga Great Bear magmatic zone (McGlynn, 1979; Bowring, 1985). Hottah terrane is interpreted as a precollisional arc that collided with Slave Craton and its west-facing passive margin during the 1.88 Ga Calderian Orogeny (Hoffman, 1980; Hildebrand, 1981; Bowring and Grotzinger, 1992; Hildebrand et al., 2010a). Rocks of the Great Bear magmatic zone are interpreted as a postcollisional arc, were folded about northwest to northerly trending axes, and are cut by abundant transcurrent faults (Hoffman and McGlynn, 1977; Hildebrand et al., 1987b, 2010b). A swarm of northwesterly trending diabase dykes, dated at 1740 Ma, cut the faults (Irving et al., 2004).
Summary(Plain Language Summary, not published)
The Leith Peninsula map area in the Great Bear region of the Northwest Territories (Canada) lies along the western margin of the Canadian Shield and is dominated by Paleoproterozoic rocks. The oldest rocks (Hottah terrane) constitute the metamorphic basement to the volcanic, plutonic, and sedimentary rocks of the Great Bear magmatic zone (1.875-1.843 billion year old). These rocks were cut by abundant transcurrent faults; diabase dykes, dated at 1740 million years, cut the faults. Subsequent extension, in places utilizing pre-existing transcurrent fault zones, led to the deposition of clastic sedimentary rocks (Hornby Bay Group) and the formation of large quartz stockworks in the fault zones. The gently inclined 780 million years Gunbarrel gabbro cuts rocks of the Hornby Bay Group. Flat lying to gently dipping lower Paleozoic sedimentary rocks sit unconformably upon the Precambrian rocks. Polymetallic deposits were mined for many years in rocks of the Great Bear magmatic zone.

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