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Canadian Cascade volcanism: Subglacial to explosive eruptions along the Sea to Sky Corridor, British Columbia

By
J.K. Russell
J.K. Russell
Earth and Ocean Sciences, The University of British Columbia, Vancouver, British Columbia, Canada
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C.J. Hickson
C.J. Hickson
Geological Survey of Canada, Vancouver, British Columbia, Canada
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Graham Andrews
Graham Andrews
Earth and Ocean Sciences, The University of British Columbia, Vancouver, British Columbia, Canada
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Published:
January 01, 2007

Abstract

Here we describe a two-day field trip to examine Quaternary volcanism in the Canadian Cascade arc, named the Garibaldi volcanic belt. Day 1 of the trip proceeds along the Whistler corridor from Squamish to Pemberton and focuses on Quaternary glaciovolcanic deposits. Interactions between volcanoes and ice in the Garibaldi volcanic belt have been common during the past two million years and this has resulted in a diverse array of landforms, including subglacial domes, tuyas, impounded lava masses, and sinuous lavas that exploited within-ice drainage systems. On Day 2, the trip heads northwest of Pemberton, British Columbia, along logging roads to see deposits from the 2360 yr B.P. eruption of the Mount Meager volcanic complex. This eruption began Plinian-style, generating pyroclastic fall and flow deposits and ended with the production of block and ash pyroclastic flows by explosive (Vulcanian) collapse of lava domes (e.g., Soufriére Hills). Many of the traits of the deposits seen on this two day trip are a reflection of, both, the style of eruption and the nature of the surrounding landscape. In this regard, the trip provides a spectacular window into the nature and hazards of effusive and explosive volcanism occurring in mountainous terrains and the role of water and ice.

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Contents

GSA Field Guide

Floods, Faults, and Fire

Pete Stelling
Pete Stelling
Geology Department Western Washington University 516 High St., MS 9080 Bellingham, Washington 98225 USA
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David S. Tucker
David S. Tucker
Geology Department Western Washington University 516 High St., MS 9080 Bellingham, Washington 98225 USA
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Geological Society of America
Volume
9
ISBN electronic:
9780813756097
Publication date:
January 01, 2007

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