World Library  
Flag as Inappropriate
Email this Article

Bennett Lake Volcanic Complex

Article Id: WHEBN0010360089
Reproduction Date:

Title: Bennett Lake Volcanic Complex  
Author: World Heritage Encyclopedia
Language: English
Subject: Caldera, Supervolcano, Bennett, Bennett Lake, Resurgent dome, List of volcanoes in Canada, Skukum Group, Mount Skukum Volcanic Complex, Coast Range Arc
Collection:
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Bennett Lake Volcanic Complex

Bennett Lake Volcanic Complex
Location
Location British Columbia/Yukon, Canada
Range Boundary Ranges, Coast Mountains
Geology
Type Caldera
Age of rock 50 million years
Last eruption Eocene

The Bennett Lake Volcanic Complex (BLVC) is a huge 50 million year old extinct caldera complex that spans across the British Columbia-Yukon border in Canada. It is located near the western end of the West Arm of Bennett Lake. The caldera complex is surrounded by granitic rocks containing pendants.

It is located near the eastern contact of the Coast Plutonic Complex and the Whitehorse Trough. There are thick series of pyroclastic and epiclastic rocks at the caldera. Remnants of this huge caldera complex are preserved near Bennett Lake in the Coast Mountains. The complex compose the Skukum Group.

Formation and eruptive history

The Bennett Lake Volcanic Complex was formed when the ancient Kula Plate was subducting under North America during the early Eocene period.[1] Cataclysmic eruptions from the Bennett Lake Volcanic Complex were from vents along arcuate fracture systems that spewed out about 850 km3 (200 cu mi) of glowing avalanches of pyroclastic rock called pyroclastic flows. Evacuation of the underlying magma chamber was followed by several stages of collapse to form two calderas, one nested inside the other, that produced an elliptical depression 19 km (12 mi) by 30 km (19 mi) across.[1] The calderas were from 200 m (656 ft) to 2,700 m (8,858 ft) deep. Volcanism continued for some time after the caldera collapse. High level andesite and rhyolite dikes and intrusive bodies crosscut volcanic flows and tuffs at all levels. Dike swarms are emplaced along ring fractures and fault zones at the southwest edge of the caldera. Near the dying stages of the volcano, magma surged upward and arched the roof of the magma chamber into a broad dome with relief of about 1,500 m (4,921 ft).

See also

References

  1. ^ a b Crustal recycling during subduction at the Eocene Cordilleran margin of North America Retrieved on 2007-06-26

This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.