Cameron River and Beaulieu River Volcanic Belts of the Archean Yellowknife Supergroup, District of Mackenzie, Northwest Territories, Issue 382
Archean greenstone belts host gold deposits in many areas of the Canadian Shield. The Yellowknife area has been a major gold producer and an active area for exploration since the early 1930s. This report documents the stratigraphy, structure and volcanology of polydeformed and metamorphosed Archean volcanic belts that border the eastern side of the Yellowknife supracrustal basin. The eruption processes, history of the development and paleoenvironment of the enormous volcanoes that erupted mainly beneath oceans more than 2600 Ma ago are unravelled.
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amphibolite amphibolite dykes andesite andesite member aphanitic Archean Basalt basement Beaulieu River biotite boundary breccias Burwash Formation Cameron River Cameron River Basalt Cameron River belt Cameron River subarea canic clastic clasts coarse conglomerate contain crystals dacite deﬁned deformed domes dominantly dyke swarm elongate eruption faults feldspar felsic felsic volcanics ﬁelds ﬁne grained ﬂattening ﬂows folds foliation fragments gneiss granitic granitoid granoblastic granodiorite grey Henderson hornblende hyaloclastites intrusions layered lenses locally maﬁc dykes maﬁc volcanics magma margins matrix metamorphism Payne Lake phenocrysts pillow breccias pillow lavas plagioclase plutons pyroclastic quartz recrystallized rhyo rhyolite River volcanic belts roches schistosity sediments shear zone Slave Province Sleepy Dragon Complex stratigraphy structural Sunset Lake Basalt Sunset Lake subarea supracrustal tectonic terrane texture thick thin tholeiitic trend tuffs Tumpline Basalt Tumpline Lake subarea Turnback Lake Turnback Rhyolite units volcanic belt volcanic rocks volcaniclastic volcanisme Webb Lake Yellowknife zones volcaniques