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Quaternary glaciovolcanism in the Canadian Cascade volcanic arc; paleoenvironmental implications

A. M. Wilson and J. K. Russell
Quaternary glaciovolcanism in the Canadian Cascade volcanic arc; paleoenvironmental implications (in Field volcanology; a tribute to the distinguished career of Don Swanson, Michael P. Poland, Michael O. Garcia, Victor E. Camp and Anita L. Grunder)
Special Paper - Geological Society of America (February 2019) 538: 133-157

Abstract

Volcanoes that interact with the cryosphere preserve indicators of their eruption environments. These glaciovolcanoes and their deposits have powerful potential as proxies of local and global paleoclimates. The Garibaldi volcanic belt is the northern (Canadian) segment of the Cascade volcanic arc. In this study, we compiled a comprehensive database of Quaternary volcanic landforms and deposits in the Garibaldi volcanic belt. We found that the region exhibits a high degree of volcanic diversity, and a significant component of this diversity is due to the abundance of glaciovolcanoes. These include: tuyas, tindars, subglacial tephra cones, ice-impounded lavas, subglacial domes and breccias, subglacial lava flows, and lava-dominated tuyas. As a group, they inform the presence, thickness, and transient properties of ancient, continental-scale ice sheets (i.e., the Cordilleran ice sheet) that have waxed and waned in thickness and extent across the region. We ascribe much of the character of glaciovolcanism in the Garibaldi volcanic belt to a wide range of magma compositions (alkaline basalt to rhyolite) and to the extreme relief of the landscape. We used forensic volcanologic evidence, in conjunction with our database, to define a terrestrial-based reconstruction of ice-sheet thickness and extent that spans the latter half of the Quaternary (i.e., past approximately 1 m.y.). We then compared our reconstruction to the marine isotope stage (MIS) record and found a number of positive correlations and discordances. We show glaciovolcanoes to be an excellent, and underutilized, proxy for Earth's paleoclimate, and a powerful tool for reconstructing ice sheets predating the last glaciation.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 538
Title: Quaternary glaciovolcanism in the Canadian Cascade volcanic arc; paleoenvironmental implications
Title: Field volcanology; a tribute to the distinguished career of Don Swanson
Author(s): Wilson, A. M.Russell, J. K.
Author(s): Poland, Michael P.
Author(s): Garcia, Michael O.
Author(s): Camp, Victor E.
Author(s): Grunder, Anita L.
Affiliation: University of British Columbia, Volcanology & Petrology Laboratory, Earth, Ocean & Atmospheric Science, Vancouver, BC, Canada
Affiliation: U. S. Geological Survey, Cascades Volcano Observatory, Vancouver, WA, United States
Pages: 133-157
Published: 20190207
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 9780813795386
References: 117
Accession Number: 2020-016563
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, geol. sketch maps
N49°00'00" - N52°00'00", W124°30'00" - W122°30'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute.
Update Code: 2020
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