The Idre marginal moraine – An anchorpoint for Middle and Late Weichselian ice sheet chronology
We here report the results of luminescence and cosmogenic exposure dating of the Idre marginal moraine, located in the southern Scandinavian Mountains. This particular moraine is targeted because it is morphologically distinct and marks the margin of a former ice sheet. The till in the moraine conta...
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ftdoajarticles:oai:doaj.org/article:2da3d964a07f48f08beb68905f3ad297 2023-05-15T16:39:55+02:00 The Idre marginal moraine – An anchorpoint for Middle and Late Weichselian ice sheet chronology Johan Kleman Martina Hättestrand Ingmar Borgström Frank Preusser Derek Fabel 2020-10-01T00:00:00Z https://doi.org/10.1016/j.qsa.2020.100010 https://doaj.org/article/2da3d964a07f48f08beb68905f3ad297 EN eng Elsevier http://www.sciencedirect.com/science/article/pii/S2666033420300101 https://doaj.org/toc/2666-0334 2666-0334 doi:10.1016/j.qsa.2020.100010 https://doaj.org/article/2da3d964a07f48f08beb68905f3ad297 Quaternary Science Advances, Vol 2, Iss , Pp 100010- (2020) Scandinavian ice sheet Luminescence dating 10Be dating Interstadial Idre moraine Geography. Anthropology. Recreation G Archaeology CC1-960 article 2020 ftdoajarticles https://doi.org/10.1016/j.qsa.2020.100010 2022-12-31T15:33:34Z We here report the results of luminescence and cosmogenic exposure dating of the Idre marginal moraine, located in the southern Scandinavian Mountains. This particular moraine is targeted because it is morphologically distinct and marks the margin of a former ice sheet. The till in the moraine contains erratics that provide strong evidence of flow from an ice sheet centred over Norway. The area immediately outside the moraine margin is an older residual soil. Luminescence ages of three samples taken from a sand lense within the moraine indicate that it formed at around 55 ka, during the early warm part of Marine Isotope Stage (MIS) 3. Median exposure ages (10Be) of ten samples from boulders embedded in the surface till indicate that about 30 ka of ice-free time have elapsed since formation of the moraine. The difference between the age of the ridge and the duration of exposure provides a measure of the time of ice-cover in the ice sheet core area. Previous research indicates that final deglaciation of the site occurred at approximately 10 ka ago, which in combination with our results implies that the area around the Idre marginal moraine was ice free for ca. 20 ka, i.e. from around 55 ka to around 35 ka. Thereafter, the area was glaciated and the marginal moraine was covered by the Late Weichselian ice sheet for around 25 ka without experiencing any significant erosion or morphological destruction. While earlier studies have already pointed towards MIS 3 ice free conditions in northern and central Sweden, this study contributes a measurement-based duration estimate for the MIS 3 interstadial. Article in Journal/Newspaper Ice Sheet Directory of Open Access Journals: DOAJ Articles Norway Quaternary Science Advances 2 100010 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Scandinavian ice sheet Luminescence dating 10Be dating Interstadial Idre moraine Geography. Anthropology. Recreation G Archaeology CC1-960 |
spellingShingle |
Scandinavian ice sheet Luminescence dating 10Be dating Interstadial Idre moraine Geography. Anthropology. Recreation G Archaeology CC1-960 Johan Kleman Martina Hättestrand Ingmar Borgström Frank Preusser Derek Fabel The Idre marginal moraine – An anchorpoint for Middle and Late Weichselian ice sheet chronology |
topic_facet |
Scandinavian ice sheet Luminescence dating 10Be dating Interstadial Idre moraine Geography. Anthropology. Recreation G Archaeology CC1-960 |
description |
We here report the results of luminescence and cosmogenic exposure dating of the Idre marginal moraine, located in the southern Scandinavian Mountains. This particular moraine is targeted because it is morphologically distinct and marks the margin of a former ice sheet. The till in the moraine contains erratics that provide strong evidence of flow from an ice sheet centred over Norway. The area immediately outside the moraine margin is an older residual soil. Luminescence ages of three samples taken from a sand lense within the moraine indicate that it formed at around 55 ka, during the early warm part of Marine Isotope Stage (MIS) 3. Median exposure ages (10Be) of ten samples from boulders embedded in the surface till indicate that about 30 ka of ice-free time have elapsed since formation of the moraine. The difference between the age of the ridge and the duration of exposure provides a measure of the time of ice-cover in the ice sheet core area. Previous research indicates that final deglaciation of the site occurred at approximately 10 ka ago, which in combination with our results implies that the area around the Idre marginal moraine was ice free for ca. 20 ka, i.e. from around 55 ka to around 35 ka. Thereafter, the area was glaciated and the marginal moraine was covered by the Late Weichselian ice sheet for around 25 ka without experiencing any significant erosion or morphological destruction. While earlier studies have already pointed towards MIS 3 ice free conditions in northern and central Sweden, this study contributes a measurement-based duration estimate for the MIS 3 interstadial. |
format |
Article in Journal/Newspaper |
author |
Johan Kleman Martina Hättestrand Ingmar Borgström Frank Preusser Derek Fabel |
author_facet |
Johan Kleman Martina Hättestrand Ingmar Borgström Frank Preusser Derek Fabel |
author_sort |
Johan Kleman |
title |
The Idre marginal moraine – An anchorpoint for Middle and Late Weichselian ice sheet chronology |
title_short |
The Idre marginal moraine – An anchorpoint for Middle and Late Weichselian ice sheet chronology |
title_full |
The Idre marginal moraine – An anchorpoint for Middle and Late Weichselian ice sheet chronology |
title_fullStr |
The Idre marginal moraine – An anchorpoint for Middle and Late Weichselian ice sheet chronology |
title_full_unstemmed |
The Idre marginal moraine – An anchorpoint for Middle and Late Weichselian ice sheet chronology |
title_sort |
idre marginal moraine – an anchorpoint for middle and late weichselian ice sheet chronology |
publisher |
Elsevier |
publishDate |
2020 |
url |
https://doi.org/10.1016/j.qsa.2020.100010 https://doaj.org/article/2da3d964a07f48f08beb68905f3ad297 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Quaternary Science Advances, Vol 2, Iss , Pp 100010- (2020) |
op_relation |
http://www.sciencedirect.com/science/article/pii/S2666033420300101 https://doaj.org/toc/2666-0334 2666-0334 doi:10.1016/j.qsa.2020.100010 https://doaj.org/article/2da3d964a07f48f08beb68905f3ad297 |
op_doi |
https://doi.org/10.1016/j.qsa.2020.100010 |
container_title |
Quaternary Science Advances |
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2 |
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100010 |
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1766030262191259648 |