Alert Bay Volcanic Belt
volcanic belt in British Columbia
The Alert Bay Volcanic Belt is a heavily eroded volcanic belt in northern Vancouver Island, British Columbia, Canada. The series of volcanic rocks and subvolcanic intrusions formed between about 8 and 2.5 million years ago during the late Neogene period. The belt extends from the Brooks Peninsula in the southwest to Port McNeill in the northeast. Eruptions of basaltic to rhyolitic volcanoes and hypabyssal rocks of the Alert Bay Volcanic Belt are probably linked with the subducted margin flanked by the Explorer and Juan de Fuca plates at the Cascadia subduction zone.
The belt is now north of the Nootka Fault, but may have been directly above the fault at the time it last erupted. The Alert Bay Volcanic Belt is poorly studied, but appears to have been active in Miocene to Pliocene time. No Holocene eruptions are known, and volcanic activity in the belt has most likely ceased.
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This entry incorporates text from “Alert Bay Volcanic Belt” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.