OSL ages in central Norway support a MIS 2 interstadial (25-20 ka) and a dynamic Scandinavian ice sheet
Recent work has suggested that the Scandinavian ice sheet was much more dynamic than previously believed, and its western marine-based margin can provide an analogue to the rapid-paced fluctuations and deglaciation observed at the margins of the Antarctic and Greenland ice sheets.In this study we us...
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ftuniaarhuspubl:oai:pure.atira.dk:publications/783d32bf-e800-42f3-9883-68824b94c2b5 2023-05-15T13:25:44+02:00 OSL ages in central Norway support a MIS 2 interstadial (25-20 ka) and a dynamic Scandinavian ice sheet Johnsen, T.F. Olsen, L. Murray, A. 2012-06-21 https://pure.au.dk/portal/da/publications/osl-ages-in-central-norway-support-a-mis-2-interstadial-2520-ka-and-a-dynamic-scandinavian-ice-sheet(783d32bf-e800-42f3-9883-68824b94c2b5).html https://doi.org/10.1016/j.quascirev.2010.10.007 http://www.scopus.com/inward/record.url?scp=84862000372&partnerID=8YFLogxK eng eng info:eu-repo/semantics/restrictedAccess Johnsen , T F , Olsen , L & Murray , A 2012 , ' OSL ages in central Norway support a MIS 2 interstadial (25-20 ka) and a dynamic Scandinavian ice sheet ' , Quaternary Science Reviews , vol. 44 , pp. 96-111 . https://doi.org/10.1016/j.quascirev.2010.10.007 article 2012 ftuniaarhuspubl https://doi.org/10.1016/j.quascirev.2010.10.007 2022-01-26T23:49:26Z Recent work has suggested that the Scandinavian ice sheet was much more dynamic than previously believed, and its western marine-based margin can provide an analogue to the rapid-paced fluctuations and deglaciation observed at the margins of the Antarctic and Greenland ice sheets.In this study we used a complimentary dating technique, OSL (Optically Stimulated Luminescence dating), to support the existence of the Trofors interstadial in central Norway; an ice-free period that existed from ~25 to 20 ka recorded at multiple sites throughout Norway (cf. Andøya interstadial) and that divides the Last Glacial Maximum (LGM) into two stadials. OSL signal component analysis was used to optimize data analysis, and internal (methodological) tests show the results to be of good quality. Both large and small aliquots gave consistent OSL ages (22.3 ± 1.7 ka, n = 7) for sub-till glaciofluvial/fluvial sediments at the Langsmoen stratigraphic site, and an apparent old age (~100 ka) for a poorly-bleached sample of glaciolacustrine sediment at the nearby stratigraphically-related Flora site. Eight radiocarbon ages of sediment from the Flora site gave consistent ages (20.9 ± 1.6 cal ka BP) that overlap within 1σ with OSL ages from the nearby Langsmoen site.The similarity in age within and between these stratigraphically-related sites and using different geochronological techniques strongly suggests that this area was ice-free around ~21 or 22 ka. The existence of the Trofors interstadial along with other interstadials during the Middle and Late Weichselian (MIS 3 and MIS 2) indicates that not only the western margin, but the whole western part of the Scandinavian ice sheet, from the ice divide to the ice margin was very dynamic. These large changes in the ice margin and accompanying drawdown of the ice surface would have affected the eastern part of the ice sheet as well. Article in Journal/Newspaper Andøya Antarc* Antarctic Greenland Ice Sheet Trofors Aarhus University: Research Andøya ENVELOPE(13.982,13.982,68.185,68.185) Antarctic Greenland Norway The Antarctic Trofors ENVELOPE(13.406,13.406,65.533,65.533) Quaternary Science Reviews 44 96 111 |
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Open Polar |
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Aarhus University: Research |
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ftuniaarhuspubl |
language |
English |
description |
Recent work has suggested that the Scandinavian ice sheet was much more dynamic than previously believed, and its western marine-based margin can provide an analogue to the rapid-paced fluctuations and deglaciation observed at the margins of the Antarctic and Greenland ice sheets.In this study we used a complimentary dating technique, OSL (Optically Stimulated Luminescence dating), to support the existence of the Trofors interstadial in central Norway; an ice-free period that existed from ~25 to 20 ka recorded at multiple sites throughout Norway (cf. Andøya interstadial) and that divides the Last Glacial Maximum (LGM) into two stadials. OSL signal component analysis was used to optimize data analysis, and internal (methodological) tests show the results to be of good quality. Both large and small aliquots gave consistent OSL ages (22.3 ± 1.7 ka, n = 7) for sub-till glaciofluvial/fluvial sediments at the Langsmoen stratigraphic site, and an apparent old age (~100 ka) for a poorly-bleached sample of glaciolacustrine sediment at the nearby stratigraphically-related Flora site. Eight radiocarbon ages of sediment from the Flora site gave consistent ages (20.9 ± 1.6 cal ka BP) that overlap within 1σ with OSL ages from the nearby Langsmoen site.The similarity in age within and between these stratigraphically-related sites and using different geochronological techniques strongly suggests that this area was ice-free around ~21 or 22 ka. The existence of the Trofors interstadial along with other interstadials during the Middle and Late Weichselian (MIS 3 and MIS 2) indicates that not only the western margin, but the whole western part of the Scandinavian ice sheet, from the ice divide to the ice margin was very dynamic. These large changes in the ice margin and accompanying drawdown of the ice surface would have affected the eastern part of the ice sheet as well. |
format |
Article in Journal/Newspaper |
author |
Johnsen, T.F. Olsen, L. Murray, A. |
spellingShingle |
Johnsen, T.F. Olsen, L. Murray, A. OSL ages in central Norway support a MIS 2 interstadial (25-20 ka) and a dynamic Scandinavian ice sheet |
author_facet |
Johnsen, T.F. Olsen, L. Murray, A. |
author_sort |
Johnsen, T.F. |
title |
OSL ages in central Norway support a MIS 2 interstadial (25-20 ka) and a dynamic Scandinavian ice sheet |
title_short |
OSL ages in central Norway support a MIS 2 interstadial (25-20 ka) and a dynamic Scandinavian ice sheet |
title_full |
OSL ages in central Norway support a MIS 2 interstadial (25-20 ka) and a dynamic Scandinavian ice sheet |
title_fullStr |
OSL ages in central Norway support a MIS 2 interstadial (25-20 ka) and a dynamic Scandinavian ice sheet |
title_full_unstemmed |
OSL ages in central Norway support a MIS 2 interstadial (25-20 ka) and a dynamic Scandinavian ice sheet |
title_sort |
osl ages in central norway support a mis 2 interstadial (25-20 ka) and a dynamic scandinavian ice sheet |
publishDate |
2012 |
url |
https://pure.au.dk/portal/da/publications/osl-ages-in-central-norway-support-a-mis-2-interstadial-2520-ka-and-a-dynamic-scandinavian-ice-sheet(783d32bf-e800-42f3-9883-68824b94c2b5).html https://doi.org/10.1016/j.quascirev.2010.10.007 http://www.scopus.com/inward/record.url?scp=84862000372&partnerID=8YFLogxK |
long_lat |
ENVELOPE(13.982,13.982,68.185,68.185) ENVELOPE(13.406,13.406,65.533,65.533) |
geographic |
Andøya Antarctic Greenland Norway The Antarctic Trofors |
geographic_facet |
Andøya Antarctic Greenland Norway The Antarctic Trofors |
genre |
Andøya Antarc* Antarctic Greenland Ice Sheet Trofors |
genre_facet |
Andøya Antarc* Antarctic Greenland Ice Sheet Trofors |
op_source |
Johnsen , T F , Olsen , L & Murray , A 2012 , ' OSL ages in central Norway support a MIS 2 interstadial (25-20 ka) and a dynamic Scandinavian ice sheet ' , Quaternary Science Reviews , vol. 44 , pp. 96-111 . https://doi.org/10.1016/j.quascirev.2010.10.007 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.quascirev.2010.10.007 |
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Quaternary Science Reviews |
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44 |
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96 |
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111 |
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1766387654800179200 |