Linge, H., Nesje, A., Matthews, J. A., Fabel, D. and Xu, S. (2020) Evidence for rapid paraglacial formation of rock glaciers in southern Norway from 10Be surface-exposure dating. Quaternary Research, 97, pp. 55-70. (doi: 10.1017/qua.2020.10)
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Abstract
We evaluate the timing and environmental controls on past rock-glacier activity at Øyberget, upper Ottadalen, southern Norway, using in situ 10Be surface-exposure dating on (1) boulders belonging to relict rock-glacier lobes at c. 530 m asl, (2) bedrock and boulder surfaces at the Øyberget summit (c. 1200 m asl), and (3) bedrock at an up-valley site (c. 615 m asl). We find that the rock-glacier lobes became inactive around 11.1 ± 1.2 ka, coeval with the timing of summit deglaciation (11.2 ± 0.7 ka). This is slightly older than previously published Schmidt-hammer surface-exposure ages. The timing does not match known climatic conditions promoting rock-glacier formation in the early Holocene; hence we infer that lobe formation resulted from enhanced debris supply and burial of residual ice during and soon after deglaciation. The results demonstrate that rock glaciers may form over a relatively short period of time (hundreds rather than thousands of years) under non-permafrost conditions and possibly indicate a paraglacial type of process.
Item Type: | Articles |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Xu, Dr Sheng and Fabel, Dr Derek |
Authors: | Linge, H., Nesje, A., Matthews, J. A., Fabel, D., and Xu, S. |
College/School: | College of Science and Engineering > Scottish Universities Environmental Research Centre |
Journal Name: | Quaternary Research |
Publisher: | Cambridge University Press |
ISSN: | 0033-5894 |
ISSN (Online): | 1096-0287 |
Published Online: | 16 April 2020 |
Copyright Holders: | Copyright © 2020 University of Washington |
First Published: | First published in Quaternary Science 97: 55-70 |
Publisher Policy: | Reproduced under a Creative Commons License |
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