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Great Bear Magmatic Zone
The Great Bear Magmatic Zone is a linear belt of Proterozoic magmatic rocks in the northwestern Canadian Shield of the Northwest Territories. It is wide and long, extending from Great Slave Lake in the south to Great Bear Lake in the northwest. It was formed about 1,810 million years ago as a result of continental arc volcanism when the Archean Slave craton started to collide with the Paleoproterozoic Hottah terrane to the west.〔(Magmatic evolution of the southern Great Bear continental arc, northwestern Canadian Shield: geochronological constraints )〕 Volcanics of the Great Bear Magmatic Zone range from basalt to rhyolite and geologic studies show the Great Bear Magmatic Zone is similar to modern continental volcanic arcs.〔(Continental intra-arc depressions: A nonextensional model for their origin, with a Proterozoic example from Wopmay orogen )〕
==See also==
*Taltson Magmatic Zone
*Volcanism of Canada
*Volcanism of Northern Canada
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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