The Queen Charlotte Basin is a structural basin mostly beneath the continental shelf offshore, between the Queen Charlotte Islands, Vancouver Island, and the British Columbia mainland, roughly coincident with the physiographic region named the Hecate Depression.
The term Queen Charlotte Basin normally refers to the Tertiary rocks, but these are underlain by what seems to be a thick Mesozoic succession. The Queen Charlotte Basin was formed by periods of extension, including thinning and volcanism during the mid-Tertiary period. The large Tertiary plutons that magnetic data suggest exist in the southeastern part of the Queen Charlotte Basin seem to be related to the Anahim hotspot.
Read more about Queen Charlotte Basin: Geology
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