Timing and pace of ice-sheet withdrawal across the marine–terrestrial transition west of Ireland during the last glaciation
This research was funded by the UK Natural Environment Research Council grant NE/J007196/1 ‘Britice‐Chrono’. The work was supported by the NERC Radiocarbon Facility (Allocation No. 1722.0613 and 1878.1014). Understanding the pace and drivers of marine‐based ice‐sheet retreat relies upon the integrat...
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Online Access: | https://hdl.handle.net/10023/22990 https://doi.org/10.1002/jqs.3295 |
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ftstandrewserep:oai:research-repository.st-andrews.ac.uk:10023/22990 2024-04-21T08:04:52+00:00 Timing and pace of ice-sheet withdrawal across the marine–terrestrial transition west of Ireland during the last glaciation Ó Cofaigh, Colm Callard, S. Louise Roberts, David H. Chiverrell, Richard C. Ballantyne, C. K. Evans, David J. A. Saher, Margot Van Landeghem, Katrien J. J. Smedley, Rachel Benetti, Sara Burke, Matthew Clark, Chris D. Duller, Geoff A. T. Fabel, Derek Livingstone, Stephen J. Mccarron, Stephen Medialdea, Alicia Moreton, Steven G. Sacchetti, Fabio University of St Andrews. School of Geography & Sustainable Development 2021-04-08T15:30:10Z 28 9866476 9872105 application/pdf https://hdl.handle.net/10023/22990 https://doi.org/10.1002/jqs.3295 eng eng Journal of Quaternary Science 273717682 56461ef1-ba17-41f2-8994-b0b463c4803b 85103673662 000637473400001 Ó Cofaigh , C , Callard , S L , Roberts , D H , Chiverrell , R C , Ballantyne , C K , Evans , D J A , Saher , M , Van Landeghem , K J J , Smedley , R , Benetti , S , Burke , M , Clark , C D , Duller , G A T , Fabel , D , Livingstone , S J , Mccarron , S , Medialdea , A , Moreton , S G & Sacchetti , F 2021 , ' Timing and pace of ice-sheet withdrawal across the marine–terrestrial transition west of Ireland during the last glaciation ' , Journal of Quaternary Science , vol. Early View . https://doi.org/10.1002/jqs.3295 0267-8179 RIS: urn:951128EAD935442A3EFCB63B878C1789 https://hdl.handle.net/10023/22990 doi:10.1002/jqs.3295 British–Irish Ice Sheet Glacimarine sediments Ice sheet extent Ice sheet retreat Last Glacial Maximum Porcupine Bank Radiocarbon dating Subglacial till Western Ireland G Geography (General) 3rd-DAS SDG 14 - Life Below Water G1 Journal article 2021 ftstandrewserep https://doi.org/10.1002/jqs.3295 2024-03-27T15:07:39Z This research was funded by the UK Natural Environment Research Council grant NE/J007196/1 ‘Britice‐Chrono’. The work was supported by the NERC Radiocarbon Facility (Allocation No. 1722.0613 and 1878.1014). Understanding the pace and drivers of marine‐based ice‐sheet retreat relies upon the integration of numerical ice‐sheet models with observations from contemporary polar ice sheets and well‐constrained palaeo‐glaciological reconstructions. This paper provides a reconstruction of the retreat of the last British–Irish Ice Sheet (BIIS) from the Atlantic shelf west of Ireland during and following the Last Glacial Maximum (LGM). It uses marine‐geophysical data and sediment cores dated by radiocarbon, combined with terrestrial cosmogenic nuclide and optically stimulated luminescence dating of onshore ice‐marginal landforms, to reconstruct the timing and rate of ice‐sheet retreat from the continental shelf and across the adjoining coastline of Ireland, thus including the switch from a marine‐ to a terrestrially‐based ice‐sheet margin. Seafloor bathymetric data in the form of moraines and grounding‐zone wedges on the continental shelf record an extensive ice sheet west of Ireland during the LGM which advanced to the outer shelf. This interpretation is supported by the presence of dated subglacial tills and overridden glacimarine sediments from across the Porcupine Bank, a westwards extension of the Irish continental shelf. The ice sheet was grounded on the outer shelf at ~26.8 ka cal bp with initial retreat underway by 25.9 ka cal bp. Retreat was not a continuous process but was punctuated by marginal oscillations until ~24.3 ka cal bp. The ice sheet thereafter retreated to the mid‐shelf where it formed a large grounding‐zone complex at ~23.7 ka cal bp. This retreat occurred in a glacimarine environment. The Aran Islands on the inner continental shelf were ice‐free by ~19.5 ka bp and the ice sheet had become largely terrestrially based by 17.3 ka bp. This suggests that the Aran Islands acted to stabilize and slow ... Article in Journal/Newspaper Ice Sheet University of St Andrews: Digital Research Repository Journal of Quaternary Science 36 5 805 832 |
institution |
Open Polar |
collection |
University of St Andrews: Digital Research Repository |
op_collection_id |
ftstandrewserep |
language |
English |
topic |
British–Irish Ice Sheet Glacimarine sediments Ice sheet extent Ice sheet retreat Last Glacial Maximum Porcupine Bank Radiocarbon dating Subglacial till Western Ireland G Geography (General) 3rd-DAS SDG 14 - Life Below Water G1 |
spellingShingle |
British–Irish Ice Sheet Glacimarine sediments Ice sheet extent Ice sheet retreat Last Glacial Maximum Porcupine Bank Radiocarbon dating Subglacial till Western Ireland G Geography (General) 3rd-DAS SDG 14 - Life Below Water G1 Ó Cofaigh, Colm Callard, S. Louise Roberts, David H. Chiverrell, Richard C. Ballantyne, C. K. Evans, David J. A. Saher, Margot Van Landeghem, Katrien J. J. Smedley, Rachel Benetti, Sara Burke, Matthew Clark, Chris D. Duller, Geoff A. T. Fabel, Derek Livingstone, Stephen J. Mccarron, Stephen Medialdea, Alicia Moreton, Steven G. Sacchetti, Fabio Timing and pace of ice-sheet withdrawal across the marine–terrestrial transition west of Ireland during the last glaciation |
topic_facet |
British–Irish Ice Sheet Glacimarine sediments Ice sheet extent Ice sheet retreat Last Glacial Maximum Porcupine Bank Radiocarbon dating Subglacial till Western Ireland G Geography (General) 3rd-DAS SDG 14 - Life Below Water G1 |
description |
This research was funded by the UK Natural Environment Research Council grant NE/J007196/1 ‘Britice‐Chrono’. The work was supported by the NERC Radiocarbon Facility (Allocation No. 1722.0613 and 1878.1014). Understanding the pace and drivers of marine‐based ice‐sheet retreat relies upon the integration of numerical ice‐sheet models with observations from contemporary polar ice sheets and well‐constrained palaeo‐glaciological reconstructions. This paper provides a reconstruction of the retreat of the last British–Irish Ice Sheet (BIIS) from the Atlantic shelf west of Ireland during and following the Last Glacial Maximum (LGM). It uses marine‐geophysical data and sediment cores dated by radiocarbon, combined with terrestrial cosmogenic nuclide and optically stimulated luminescence dating of onshore ice‐marginal landforms, to reconstruct the timing and rate of ice‐sheet retreat from the continental shelf and across the adjoining coastline of Ireland, thus including the switch from a marine‐ to a terrestrially‐based ice‐sheet margin. Seafloor bathymetric data in the form of moraines and grounding‐zone wedges on the continental shelf record an extensive ice sheet west of Ireland during the LGM which advanced to the outer shelf. This interpretation is supported by the presence of dated subglacial tills and overridden glacimarine sediments from across the Porcupine Bank, a westwards extension of the Irish continental shelf. The ice sheet was grounded on the outer shelf at ~26.8 ka cal bp with initial retreat underway by 25.9 ka cal bp. Retreat was not a continuous process but was punctuated by marginal oscillations until ~24.3 ka cal bp. The ice sheet thereafter retreated to the mid‐shelf where it formed a large grounding‐zone complex at ~23.7 ka cal bp. This retreat occurred in a glacimarine environment. The Aran Islands on the inner continental shelf were ice‐free by ~19.5 ka bp and the ice sheet had become largely terrestrially based by 17.3 ka bp. This suggests that the Aran Islands acted to stabilize and slow ... |
author2 |
University of St Andrews. School of Geography & Sustainable Development |
format |
Article in Journal/Newspaper |
author |
Ó Cofaigh, Colm Callard, S. Louise Roberts, David H. Chiverrell, Richard C. Ballantyne, C. K. Evans, David J. A. Saher, Margot Van Landeghem, Katrien J. J. Smedley, Rachel Benetti, Sara Burke, Matthew Clark, Chris D. Duller, Geoff A. T. Fabel, Derek Livingstone, Stephen J. Mccarron, Stephen Medialdea, Alicia Moreton, Steven G. Sacchetti, Fabio |
author_facet |
Ó Cofaigh, Colm Callard, S. Louise Roberts, David H. Chiverrell, Richard C. Ballantyne, C. K. Evans, David J. A. Saher, Margot Van Landeghem, Katrien J. J. Smedley, Rachel Benetti, Sara Burke, Matthew Clark, Chris D. Duller, Geoff A. T. Fabel, Derek Livingstone, Stephen J. Mccarron, Stephen Medialdea, Alicia Moreton, Steven G. Sacchetti, Fabio |
author_sort |
Ó Cofaigh, Colm |
title |
Timing and pace of ice-sheet withdrawal across the marine–terrestrial transition west of Ireland during the last glaciation |
title_short |
Timing and pace of ice-sheet withdrawal across the marine–terrestrial transition west of Ireland during the last glaciation |
title_full |
Timing and pace of ice-sheet withdrawal across the marine–terrestrial transition west of Ireland during the last glaciation |
title_fullStr |
Timing and pace of ice-sheet withdrawal across the marine–terrestrial transition west of Ireland during the last glaciation |
title_full_unstemmed |
Timing and pace of ice-sheet withdrawal across the marine–terrestrial transition west of Ireland during the last glaciation |
title_sort |
timing and pace of ice-sheet withdrawal across the marine–terrestrial transition west of ireland during the last glaciation |
publishDate |
2021 |
url |
https://hdl.handle.net/10023/22990 https://doi.org/10.1002/jqs.3295 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
Journal of Quaternary Science 273717682 56461ef1-ba17-41f2-8994-b0b463c4803b 85103673662 000637473400001 Ó Cofaigh , C , Callard , S L , Roberts , D H , Chiverrell , R C , Ballantyne , C K , Evans , D J A , Saher , M , Van Landeghem , K J J , Smedley , R , Benetti , S , Burke , M , Clark , C D , Duller , G A T , Fabel , D , Livingstone , S J , Mccarron , S , Medialdea , A , Moreton , S G & Sacchetti , F 2021 , ' Timing and pace of ice-sheet withdrawal across the marine–terrestrial transition west of Ireland during the last glaciation ' , Journal of Quaternary Science , vol. Early View . https://doi.org/10.1002/jqs.3295 0267-8179 RIS: urn:951128EAD935442A3EFCB63B878C1789 https://hdl.handle.net/10023/22990 doi:10.1002/jqs.3295 |
op_doi |
https://doi.org/10.1002/jqs.3295 |
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Journal of Quaternary Science |
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36 |
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5 |
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832 |
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