Great Bear Magmatic Zone

Great Bear Magmatic Zone
Volcanic arc
Country Canada
Regions Northwest Territories
Period Proterozoic

The Great Bear Magmatic Zone is a linear belt of Proterozoic magmatic rocks in the northwestern Canadian Shield of the Northwest Territories. It is 100 km (62 mi) wide and 800 km (497 mi) 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.[1] 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.[2]

See also

References

  1. ↑ Magmatic evolution of the southern Great Bear continental arc, northwestern Canadian Shield: geochronological constraints
  2. ↑ Continental intra-arc depressions: A nonextensional model for their origin, with a Proterozoic example from Wopmay orogen

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