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

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doi: 10.1016/j.epsl.2007.10.052
Author(s): Bigg, Grant R.; Clark, C. D.; Hughes, A. L. C.
Author Affiliation(s): Primary:
University of Sheffield, Department of Geography, Sheffield, United Kingdom
Volume Title: Earth and Planetary Science Letters
Source: Earth and Planetary Science Letters, 265(3-4), p.559-570. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X CODEN: EPSLA2
Note: In English. Includes appendices. 54 refs.; illus., incl. 1 table, geol. sketch maps
Summary: 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 40 ka BP. We speculate that rapid decay of the first stage of the ice sheet may have triggered substantial volcanic activity.
Year of Publication: 2008
Research Program: ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Asia; Commonwealth of Independent States; Cores; Geomorphology; Glacial geology; Glaciation; Ice; Ice rafting; Ice sheets; Icebergs; Igneous rocks; Kamchatka Russian Federation; Last glacial maximum; Leg 145; Marine sediments; North Pacific; Northwest Pacific; ODP Site 883; Ocean Drilling Program; Pacific Ocean; Pyroclastics; Reconstruction; Remote sensing; Russian Far East; Russian Federation; Sediments; Trajectories; Volcanic ash; Volcanic rocks; Volcanism; West Pacific
Coordinates: N511155 N511155 E1674607 E1674607
Record ID: 2008071763
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands