Fennoscandian palaeoglaciology reconstructed using a glacial geological inversion model
Abstract The evolution of ice-sheet configuration and flow pattern in Fennoscandia through the last glacial cycle was reconstructed using a glacial geological inversion model, i.e. a theoretical model that formalises the procedure of using the landform record to reconstruct ice sheets. The model use...
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Language: | English |
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Cambridge University Press (CUP)
1997
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Online Access: | http://dx.doi.org/10.1017/s0022143000003233 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000003233 |
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crcambridgeupr:10.1017/s0022143000003233 2024-09-15T18:06:00+00:00 Fennoscandian palaeoglaciology reconstructed using a glacial geological inversion model Kleman, Johan Hättestrand, Clas Borgström, Ingmar Stroeven, Arjen 1997 http://dx.doi.org/10.1017/s0022143000003233 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000003233 en eng Cambridge University Press (CUP) Journal of Glaciology volume 43, issue 144, page 283-299 ISSN 0022-1430 1727-5652 journal-article 1997 crcambridgeupr https://doi.org/10.1017/s0022143000003233 2024-07-31T04:03:43Z Abstract The evolution of ice-sheet configuration and flow pattern in Fennoscandia through the last glacial cycle was reconstructed using a glacial geological inversion model, i.e. a theoretical model that formalises the procedure of using the landform record to reconstruct ice sheets. The model uses mapped flow traces and deglacial melt-water landforms, as well as relative chronologies derived from cross-cutting striae and till lineations, as input data. Flow-trace systems were classified into four types: (i) time-transgressive wet-bed deglacial fans, (ii) time-transgressive frozen-bed deglacial fans, (iii) surge fans, and (iv) synchronous non-deglacial (event) fans. Using relative chronologies and aggregation of fans into glaciologically plausible patterns, a series of ice-sheet Configurations at different time slices was erected. A chronology was constructed through correlation with dated stratigraphical records and proxy data reflecting global ice volume. Geological evidence exists for several discrete ice-sheet configurations centred over the Scandinavian mountain range during the early Weichselian. The build-up of the main Weichselian Fennoscandian ice sheet started at approximately 70 Ka, and our results indicate that it was characterised by an ice sheet with a centre of mass located over southern Norway. This configuration had a flow pattern which is poorly reproduced by current numerical models of the Fennoscandian ice sheet. At the Last Glacial Maximum the main ice divide was located overthe Gulf of Bothnia. A major bend in the ice divide was caused by outflow of ice to the northwest over the lowest part of the Scandinavian mountain chain. Widespread areas of preserved pre-late-Weichselian landscapes indicate that the ice sheet had a frozen-bed core area, which was only partly diminished in size by inward-transgressive wet-bed zones during the decay phase. Article in Journal/Newspaper Fennoscandia Fennoscandian Ice Sheet Journal of Glaciology Cambridge University Press Journal of Glaciology 43 144 283 299 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Abstract The evolution of ice-sheet configuration and flow pattern in Fennoscandia through the last glacial cycle was reconstructed using a glacial geological inversion model, i.e. a theoretical model that formalises the procedure of using the landform record to reconstruct ice sheets. The model uses mapped flow traces and deglacial melt-water landforms, as well as relative chronologies derived from cross-cutting striae and till lineations, as input data. Flow-trace systems were classified into four types: (i) time-transgressive wet-bed deglacial fans, (ii) time-transgressive frozen-bed deglacial fans, (iii) surge fans, and (iv) synchronous non-deglacial (event) fans. Using relative chronologies and aggregation of fans into glaciologically plausible patterns, a series of ice-sheet Configurations at different time slices was erected. A chronology was constructed through correlation with dated stratigraphical records and proxy data reflecting global ice volume. Geological evidence exists for several discrete ice-sheet configurations centred over the Scandinavian mountain range during the early Weichselian. The build-up of the main Weichselian Fennoscandian ice sheet started at approximately 70 Ka, and our results indicate that it was characterised by an ice sheet with a centre of mass located over southern Norway. This configuration had a flow pattern which is poorly reproduced by current numerical models of the Fennoscandian ice sheet. At the Last Glacial Maximum the main ice divide was located overthe Gulf of Bothnia. A major bend in the ice divide was caused by outflow of ice to the northwest over the lowest part of the Scandinavian mountain chain. Widespread areas of preserved pre-late-Weichselian landscapes indicate that the ice sheet had a frozen-bed core area, which was only partly diminished in size by inward-transgressive wet-bed zones during the decay phase. |
format |
Article in Journal/Newspaper |
author |
Kleman, Johan Hättestrand, Clas Borgström, Ingmar Stroeven, Arjen |
spellingShingle |
Kleman, Johan Hättestrand, Clas Borgström, Ingmar Stroeven, Arjen Fennoscandian palaeoglaciology reconstructed using a glacial geological inversion model |
author_facet |
Kleman, Johan Hättestrand, Clas Borgström, Ingmar Stroeven, Arjen |
author_sort |
Kleman, Johan |
title |
Fennoscandian palaeoglaciology reconstructed using a glacial geological inversion model |
title_short |
Fennoscandian palaeoglaciology reconstructed using a glacial geological inversion model |
title_full |
Fennoscandian palaeoglaciology reconstructed using a glacial geological inversion model |
title_fullStr |
Fennoscandian palaeoglaciology reconstructed using a glacial geological inversion model |
title_full_unstemmed |
Fennoscandian palaeoglaciology reconstructed using a glacial geological inversion model |
title_sort |
fennoscandian palaeoglaciology reconstructed using a glacial geological inversion model |
publisher |
Cambridge University Press (CUP) |
publishDate |
1997 |
url |
http://dx.doi.org/10.1017/s0022143000003233 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000003233 |
genre |
Fennoscandia Fennoscandian Ice Sheet Journal of Glaciology |
genre_facet |
Fennoscandia Fennoscandian Ice Sheet Journal of Glaciology |
op_source |
Journal of Glaciology volume 43, issue 144, page 283-299 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000003233 |
container_title |
Journal of Glaciology |
container_volume |
43 |
container_issue |
144 |
container_start_page |
283 |
op_container_end_page |
299 |
_version_ |
1810443509649375232 |