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Book Chapter

Quaternary subglacial and explosive volcanism in the Canadian Cascade arc (Sea-to-Sky Corridor), British Columbia

By
Graham D.M. Andrews
Graham D.M. Andrews
Geological Sciences, California State University Bakersfield, Bakersfield, California 93311, USA
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Lucy Porritt
Lucy Porritt
Earth and Ocean Sciences, The University of British Columbia, Vancouver, British Columbia V6T1Z4, Canada
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J.K. Russell
J.K. Russell
Earth and Ocean Sciences, The University of British Columbia, Vancouver, British Columbia V6T1Z4, Canada
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Published:
January 01, 2014

Abstract

This field guide examines Quaternary volcanism in the Canadian Cascade arc informally known as the Garibaldi Volcanic Belt. During the first day, the trip proceeds along the Sea-to-Sky Highway corridor from Vancouver to Pemberton and focuses on Quaternary glaciovolcanic deposits and lavas. Interactions between volcanoes and ice in the Garibaldi Volcanic Belt have been common during the past two million years, which 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 Days 2 and 3, 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. The eruption began Plinian-style, generating pyroclastic fall and density current deposits (Day 2) and ended with the production of welded and nonwelded block and ash flows by explosive (Vulcanian) collapse of a lava (Day 3). The guide will examine the deposits of the temporary lake impounded by a block and ash flow deposit dam, and the evidence of the catastrophic failure of the dam and the generation of a huge outburst flood and lahar. Many of the traits of the deposits seen on this three-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

Trials and Tribulations of Life on an Active Subduction Zone: Field Trips in and around Vancouver, Canada

Shahin Dashtgard
Shahin Dashtgard
Department of Earth Sciences Simon Fraser University 8888 University Drive Burnaby, British Columbia V5A 1S6, Canada
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Brent Ward
Brent Ward
Department of Earth Sciences Simon Fraser University 8888 University Drive Burnaby, British Columbia V5A 1S6, Canada
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Geological Society of America
Volume
38
ISBN electronic:
9780813756387
Publication date:
January 01, 2014

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