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A last glacial ice sheet on the Pacific Russian coast and catastrophic change arising from coupled ice–volcanic interaction

Bigg, G.R., Clark, C.D. and Hughes, A.L.C. (2008) A last glacial ice sheet on the Pacific Russian coast and catastrophic change arising from coupled ice–volcanic interaction. Earth and Planetary Science Letters, 265 (3-4). pp. 559-570. ISSN 0012-821X

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Abstract

Controversy exists over the extent of glaciation in Eastern Asia at the Last Glacial Maximum: complete ice sheet cover vs. restricted mountain icefields (an area discrepancy equivalent to 3.7 Greenland Ice Sheets). Current arguments favour the latter. However, significant last glacial ice-rafted debris (IRD) exists in NW Pacific ocean cores, which must have been sourced from a major ice sheet somewhere bordering the North Pacific. The origin of this IRD is addressed through a combination of marine core analysis, iceberg trajectory modelling and remote sensing of glacial geomorphology. We find compelling evidence for two stages of glaciation centred on the Kamchatka area of maritime southeast Russia during the last glacial, with ice extent intermediate in size between previous maximum and minimum reconstructions. Furthermore, a significant increase in iceberg flux precedes, and accompanies, a substantial marine core ash deposit at around 40ka BP. We speculate that rapid decay of the first stage of the ice sheet may have triggered substantial volcanic activity.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright © 2007 Elsevier B.V. This is an author produced version of a paper published in Earth and Planetary Science Letters. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: Kamchatka, ice sheet, Last Glacial, volcanic ash, ice-rafted debris, ODP Site 883
Academic Units: The University of Sheffield > Faculty of Social Sciences (Sheffield) > Department of Geography (Sheffield)
Depositing User: Repository Officer
Date Deposited: 28 Mar 2008 17:54
Last Modified: 08 Feb 2013 16:55
Published Version: http://dx.doi.org/10.1016/j.epsl.2007.10.052
Status: Published
Publisher: Elsevier
Refereed: Yes
Identification Number: 10.1016/j.epsl.2007.10.052
URI: http://eprints.whiterose.ac.uk/id/eprint/3715

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