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Volcanism and glacial interaction in the Wells Gray–Clearwater volcanic field, east-central British Columbia

By
Catherine J. Hickson*
Catherine J. Hickson*
Geological Consultant, Burnaby, British Columbia V5H 4E9, Canada
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Nathalie Vigouroux*
Nathalie Vigouroux*
Department of Earth & Environmental Science, Douglas College, 700 Royal Avenue, New Westminster, British Columbia V3M 5Z5, Canada
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Published:
January 01, 2014

Abstract

This field guide describes a three-day trip from Vancouver, British Columbia, to the Wells Gray–Clearwater volcanic field (WGCVF) in east-central British Columbia. The WGCVF is the site of transitional to alkali olivine basaltic volcanism erupted over the last three million years. The small volume magmas (<1 km3) erupted along preexisting normal faults related to the late stages of Cordilleran terrane amalgamation, along the boundary between the miogeoclinal and pericratonic rocks of the Kootenay terrane and the allochthonous Slide Mountain and Quesnellia terranes west of ancestral North America. The magmas are highly enriched in incompatible elements, especially large-ion lithophile elements, and are interpreted as the result of low degrees of partial melting of a heterogeneous, metasomatized mantle. Upon ascent through the crust, they carried up both crustal and mantle xenoliths. During the eruptive period of the WGCVF, at least four glacial periods have occurred. The interplay between volcanism and glaciation is captured in the wide range of volcanic features found in the region. Field trip participants will view numerous diverse volcanic landforms and deposits: from tuyas to ice-marginal valley-edge deposits, volcanoclastic-lacustrine deposits, and associated pillow lavas and hyaloclastites.

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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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