Coppermine River Group

The Coppermine River Group is a sequence of Mesoproterozoic continental flood basalts forming part of the Mackenzie Large Igneous Province in the Northwest Territories and Nunavut, Canada.

It is among the largest flood basalt provinces on Earth, covering the area with a volume of approximately 650,000 km3 (155,943 cu mi).

[1] The Coppermine River Group was formed when vast volumes of basaltic lava paved over a large area of the northwestern Canadian Shield about 1,267 million years ago.

Except for the lowermost flows, which contain evidence of interaction with water, the entire sequence was erupted subaerially.

These flood basalts have been interpreted as contemporaneous with the giant Mackenzie dike swarm and with the Muskox intrusion.