Late Devensian ice-marginal features in the central North Sea - processes and chronology
Palaeoglaciological reconstructions of the North Sea sector of the last British Ice Sheet have, as other shelf areas, suffered from a lack of dates directly related to ice-front positions. In the present study new high-resolution TOPAS seismic data, bathymetric records and sediment core data from th...
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Online Access: | https://oceanrep.geomar.de/id/eprint/38237/ https://oceanrep.geomar.de/id/eprint/38237/1/Sejrup.pdf https://doi.org/10.1111/bor.12090 |
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ftoceanrep:oai:oceanrep.geomar.de:38237 2023-05-15T16:13:07+02:00 Late Devensian ice-marginal features in the central North Sea - processes and chronology Sejrup, Hans Petter Hjelstuen, Berit Oline Nygård, Atle Haflidason, Haflidi Mardal, Ivar 2015 text https://oceanrep.geomar.de/id/eprint/38237/ https://oceanrep.geomar.de/id/eprint/38237/1/Sejrup.pdf https://doi.org/10.1111/bor.12090 en eng Wiley https://oceanrep.geomar.de/id/eprint/38237/1/Sejrup.pdf Sejrup, H. P., Hjelstuen, B. O., Nygård, A., Haflidason, H. and Mardal, I. (2015) Late Devensian ice-marginal features in the central North Sea - processes and chronology. Boreas, 44 (1). pp. 1-13. DOI 10.1111/bor.12090 <https://doi.org/10.1111/bor.12090>. doi:10.1111/bor.12090 info:eu-repo/semantics/closedAccess Article PeerReviewed 2015 ftoceanrep https://doi.org/10.1111/bor.12090 2023-04-07T15:33:50Z Palaeoglaciological reconstructions of the North Sea sector of the last British Ice Sheet have, as other shelf areas, suffered from a lack of dates directly related to ice-front positions. In the present study new high-resolution TOPAS seismic data, bathymetric records and sediment core data from the Witch Ground Basin, central North Sea, were compiled. This compilation made it possible to map out three ice-marginal positions, partly through identification of terminal moraines and partly through location of glacial-fed debrisflows. The interfingering of the distal parts of the glacial-fed debrisflows with continuous marine sedimentation enabled the development of a chronology for glacial events based on previously published and some new radiocarbon dates on marine molluscs and foraminifera. From these data it is suggested that after the central Witch Ground Basin was deglaciated at c. 27 cal. ka BP, the eastern part was inundated by glacial ice from the east in the Tampen advance at c. 21 cal. ka BP. Subsequently, the basin was inundated by ice from northeast during the Fladen 1 (c. 17.5 cal. ka BP) and the Fladen 2 (16.2 cal. ka BP) events. It should be emphasized that the Fladen 1 and 2 events, individually, may represent dynamics of relatively small lobes of glacial ice at the margin of the British Ice Sheet and that the climatic significance of these may be questioned. However, the Fladen Events probably correlate in time with the Clogher Head and Killard Point re-advances previously documented from Ireland and the Bremanger event from off western Norway, suggesting that the British and Fennoscandian ice sheets both had major advances in their northwestern parts, close to the northwestern European seaboard, at this time. Article in Journal/Newspaper Fennoscandian Ice Sheet OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Norway Tampen ENVELOPE(9.667,9.667,78.167,78.167) Boreas 44 1 1 13 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Palaeoglaciological reconstructions of the North Sea sector of the last British Ice Sheet have, as other shelf areas, suffered from a lack of dates directly related to ice-front positions. In the present study new high-resolution TOPAS seismic data, bathymetric records and sediment core data from the Witch Ground Basin, central North Sea, were compiled. This compilation made it possible to map out three ice-marginal positions, partly through identification of terminal moraines and partly through location of glacial-fed debrisflows. The interfingering of the distal parts of the glacial-fed debrisflows with continuous marine sedimentation enabled the development of a chronology for glacial events based on previously published and some new radiocarbon dates on marine molluscs and foraminifera. From these data it is suggested that after the central Witch Ground Basin was deglaciated at c. 27 cal. ka BP, the eastern part was inundated by glacial ice from the east in the Tampen advance at c. 21 cal. ka BP. Subsequently, the basin was inundated by ice from northeast during the Fladen 1 (c. 17.5 cal. ka BP) and the Fladen 2 (16.2 cal. ka BP) events. It should be emphasized that the Fladen 1 and 2 events, individually, may represent dynamics of relatively small lobes of glacial ice at the margin of the British Ice Sheet and that the climatic significance of these may be questioned. However, the Fladen Events probably correlate in time with the Clogher Head and Killard Point re-advances previously documented from Ireland and the Bremanger event from off western Norway, suggesting that the British and Fennoscandian ice sheets both had major advances in their northwestern parts, close to the northwestern European seaboard, at this time. |
format |
Article in Journal/Newspaper |
author |
Sejrup, Hans Petter Hjelstuen, Berit Oline Nygård, Atle Haflidason, Haflidi Mardal, Ivar |
spellingShingle |
Sejrup, Hans Petter Hjelstuen, Berit Oline Nygård, Atle Haflidason, Haflidi Mardal, Ivar Late Devensian ice-marginal features in the central North Sea - processes and chronology |
author_facet |
Sejrup, Hans Petter Hjelstuen, Berit Oline Nygård, Atle Haflidason, Haflidi Mardal, Ivar |
author_sort |
Sejrup, Hans Petter |
title |
Late Devensian ice-marginal features in the central North Sea - processes and chronology |
title_short |
Late Devensian ice-marginal features in the central North Sea - processes and chronology |
title_full |
Late Devensian ice-marginal features in the central North Sea - processes and chronology |
title_fullStr |
Late Devensian ice-marginal features in the central North Sea - processes and chronology |
title_full_unstemmed |
Late Devensian ice-marginal features in the central North Sea - processes and chronology |
title_sort |
late devensian ice-marginal features in the central north sea - processes and chronology |
publisher |
Wiley |
publishDate |
2015 |
url |
https://oceanrep.geomar.de/id/eprint/38237/ https://oceanrep.geomar.de/id/eprint/38237/1/Sejrup.pdf https://doi.org/10.1111/bor.12090 |
long_lat |
ENVELOPE(9.667,9.667,78.167,78.167) |
geographic |
Norway Tampen |
geographic_facet |
Norway Tampen |
genre |
Fennoscandian Ice Sheet |
genre_facet |
Fennoscandian Ice Sheet |
op_relation |
https://oceanrep.geomar.de/id/eprint/38237/1/Sejrup.pdf Sejrup, H. P., Hjelstuen, B. O., Nygård, A., Haflidason, H. and Mardal, I. (2015) Late Devensian ice-marginal features in the central North Sea - processes and chronology. Boreas, 44 (1). pp. 1-13. DOI 10.1111/bor.12090 <https://doi.org/10.1111/bor.12090>. doi:10.1111/bor.12090 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1111/bor.12090 |
container_title |
Boreas |
container_volume |
44 |
container_issue |
1 |
container_start_page |
1 |
op_container_end_page |
13 |
_version_ |
1765998724741332992 |