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Lake stratigraphy implies an 80 000 yr delayed melting of buried dead ice in northern Russia

Henriksen, Mona; Mangerud, Jan; Matiouchkov, Alexei; Paus, Aage; Svendsen, John-Inge
Peer reviewed, Journal article
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URI
https://hdl.handle.net/1956/377
Date
2003
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  • Department of Earth Science [670]
Original version
https://doi.org/10.1002/jqs.788
Abstract
Sediment cores from lakes Kormovoye and Oshkoty in the glaciated region of the Pechora Lowland, northern Russia, reveal sediment gravity flow deposits overlain by lacustrine mud and gyttja. The sediments were deposited mainly during melting of buried glacier ice beneath the lakes. In Lake Kormovoye, differential melting of dead ice caused the lake bottom to subside at different places at different times, resulting in sedimentation and erosion occurring only some few metres apart and at shifting locations, as further melting caused inversion of the lake bottom. Basal radiocarbon dates from the two lakes, ranging between 13 and 9 ka, match with basal dates from other lakes in the Pechora Lowland as well as melting of ice-wedges. This indicates that buried glacier ice has survived for ca. 80 000 years from the last glaciation of this area at 90 ka until about 13 ka when a warmer climate caused melting of permafrost and buried glacier ice, forming numerous lakes and a fresh-looking glacial landscape.
Publisher
Wiley
Copyright
Copyright 2003 John Wiley & Sons, Ltd.

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