Evidence for rapid paraglacial formation of rock glaciers in southern Norway from 10Be surface-exposure dating
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...
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Online Access: | https://hdl.handle.net/11250/2740426 https://doi.org/10.1017/qua.2020.10 |
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ftunivbergen:oai:bora.uib.no:11250/2740426 2023-05-15T16:21:54+02:00 Evidence for rapid paraglacial formation of rock glaciers in southern Norway from 10Be surface-exposure dating Linge, Henriette Nesje, Atle Matthews, John A. Fabel, Derek Xu, Sheng 2020-04-16 application/pdf https://hdl.handle.net/11250/2740426 https://doi.org/10.1017/qua.2020.10 eng eng Cambridge University Press urn:issn:0033-5894 https://hdl.handle.net/11250/2740426 https://doi.org/10.1017/qua.2020.10 cristin:1850703 Quaternary Research. 2020, 97, 55 - 70 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright University of Washington Quaternary Research 55-70 97 Journal article Peer reviewed 2020 ftunivbergen https://doi.org/10.1017/qua.2020.10 2023-03-14T17:44:25Z 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. publishedVersion Article in Journal/Newspaper glacier Ice permafrost University of Bergen: Bergen Open Research Archive (BORA-UiB) Norway Øyberget ENVELOPE(9.904,9.904,63.167,63.167) Quaternary Research 97 55 70 |
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Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
description |
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. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Linge, Henriette Nesje, Atle Matthews, John A. Fabel, Derek Xu, Sheng |
spellingShingle |
Linge, Henriette Nesje, Atle Matthews, John A. Fabel, Derek Xu, Sheng Evidence for rapid paraglacial formation of rock glaciers in southern Norway from 10Be surface-exposure dating |
author_facet |
Linge, Henriette Nesje, Atle Matthews, John A. Fabel, Derek Xu, Sheng |
author_sort |
Linge, Henriette |
title |
Evidence for rapid paraglacial formation of rock glaciers in southern Norway from 10Be surface-exposure dating |
title_short |
Evidence for rapid paraglacial formation of rock glaciers in southern Norway from 10Be surface-exposure dating |
title_full |
Evidence for rapid paraglacial formation of rock glaciers in southern Norway from 10Be surface-exposure dating |
title_fullStr |
Evidence for rapid paraglacial formation of rock glaciers in southern Norway from 10Be surface-exposure dating |
title_full_unstemmed |
Evidence for rapid paraglacial formation of rock glaciers in southern Norway from 10Be surface-exposure dating |
title_sort |
evidence for rapid paraglacial formation of rock glaciers in southern norway from 10be surface-exposure dating |
publisher |
Cambridge University Press |
publishDate |
2020 |
url |
https://hdl.handle.net/11250/2740426 https://doi.org/10.1017/qua.2020.10 |
long_lat |
ENVELOPE(9.904,9.904,63.167,63.167) |
geographic |
Norway Øyberget |
geographic_facet |
Norway Øyberget |
genre |
glacier Ice permafrost |
genre_facet |
glacier Ice permafrost |
op_source |
Quaternary Research 55-70 97 |
op_relation |
urn:issn:0033-5894 https://hdl.handle.net/11250/2740426 https://doi.org/10.1017/qua.2020.10 cristin:1850703 Quaternary Research. 2020, 97, 55 - 70 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright University of Washington |
op_doi |
https://doi.org/10.1017/qua.2020.10 |
container_title |
Quaternary Research |
container_volume |
97 |
container_start_page |
55 |
op_container_end_page |
70 |
_version_ |
1766009873930125312 |