Great Bear Magmatic Zone
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The Great Bear Magmatic Zone (GBMZ) is a Paleoproterozoic (1.875–1.86 Ga) multi-collisional orogenic belt of which 100 km × 400 km (62 mi × 249 mi) is exposed in the northwestern Canadian Shield east of Great Bear Lake, Northwest Territories.[1]
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Covering 40,000 km2 (15,000 sq mi), the GBMZ forms part of the Wopmay orogen together with the Coronation Margin and Hottah terrane and overlies these two tectonic elements. The GBMZ, in turn, is covered by Paleozoic and Proterozoic sediments and, as indicated by a long aeromagnetic line, the sub-aerial part of the GMBZ is probably 800 km (500 mi) long. Volcanics of the GBMZ range from basalt to rhyolite and geologic studies show it is part of an early Proterozoic continental volcanic arc.[1]