Exploring controls of the early and stepped deglaciation on the western margin of the British Irish Ice Sheet
New optically stimulated luminescence dating and Bayesian models integrating all legacy and BRITICE-CHRONO geochronology facilitated exploration of the controls on the deglaciation of two former sectors of the British–Irish Ice Sheet, the Donegal Bay (DBIS) and Malin Sea ice-streams (MSIS). Shelf-ed...
Published in: | Journal of Quaternary Science |
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2021
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Online Access: | https://risweb.st-andrews.ac.uk/portal/en/researchoutput/exploring-controls-of-the-early-and-stepped-deglaciation-on-the-western-margin-of-the-british-irish-ice-sheet(c24a50ec-c773-4b86-8cf9-f6622f7d26aa).html https://doi.org/10.1002/jqs.3315 https://research-repository.st-andrews.ac.uk/bitstream/10023/23305/1/Benetti_2021_JQS_Exploring_CC.pdf |
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ftunstandrewcris:oai:risweb.st-andrews.ac.uk:publications/c24a50ec-c773-4b86-8cf9-f6622f7d26aa 2023-05-15T16:40:38+02:00 Exploring controls of the early and stepped deglaciation on the western margin of the British Irish Ice Sheet Benetti, Sara Chiverrell, Richard C. Cofaigh, Colm Ó. Burke, Matt Medialdea, Alicia Small, David Ballantyne, Colin Bateman, Mark D. Callard, S. Louise Wilson, Peter Fabel, Derek Clark, Chris D. Arosio, Riccardo Bradley, Sarah Dunlop, Paul Ely, Jeremy C. Gales, Jenny Livingstone, Stephen J. Moreton, Steven G. Purcell, Catriona Saher, Margot Schiele, Kevin Van Landeghem, Katrien Weilbach, Kasper 2021-06-02 application/pdf https://risweb.st-andrews.ac.uk/portal/en/researchoutput/exploring-controls-of-the-early-and-stepped-deglaciation-on-the-western-margin-of-the-british-irish-ice-sheet(c24a50ec-c773-4b86-8cf9-f6622f7d26aa).html https://doi.org/10.1002/jqs.3315 https://research-repository.st-andrews.ac.uk/bitstream/10023/23305/1/Benetti_2021_JQS_Exploring_CC.pdf eng eng info:eu-repo/semantics/openAccess Benetti , S , Chiverrell , R C , Cofaigh , C Ó , Burke , M , Medialdea , A , Small , D , Ballantyne , C , Bateman , M D , Callard , S L , Wilson , P , Fabel , D , Clark , C D , Arosio , R , Bradley , S , Dunlop , P , Ely , J C , Gales , J , Livingstone , S J , Moreton , S G , Purcell , C , Saher , M , Schiele , K , Van Landeghem , K & Weilbach , K 2021 , ' Exploring controls of the early and stepped deglaciation on the western margin of the British Irish Ice Sheet ' , Journal of Quaternary Science , vol. Early View . https://doi.org/10.1002/jqs.3315 Deglaciation Donegal Ice streams Malin Sea Retreat rate article 2021 ftunstandrewcris https://doi.org/10.1002/jqs.3315 2021-12-26T14:38:40Z New optically stimulated luminescence dating and Bayesian models integrating all legacy and BRITICE-CHRONO geochronology facilitated exploration of the controls on the deglaciation of two former sectors of the British–Irish Ice Sheet, the Donegal Bay (DBIS) and Malin Sea ice-streams (MSIS). Shelf-edge glaciation occurred ~27 ka, before the global Last Glacial Maximum, and shelf-wide retreat began 26–26.5 ka at a rate of ~18.7–20.7 m a –1 . MSIS grounding zone wedges and DBIS recessional moraines show episodic retreat punctuated by prolonged still-stands. By ~23–22 ka the outer shelf (~25 000 km 2 ) was free of grounded ice. After this time, MSIS retreat was faster (~20 m a –1 vs. ~2–6 m a –1 of DBIS). Separation of Irish and Scottish ice sources occurred ~20–19.5 ka, leaving an autonomous Donegal ice dome. Inner Malin shelf deglaciation followed the submarine troughs reaching the Hebridean coast ~19 ka. DBIS retreat formed the extensive complex of moraines in outer Donegal Bay at 20.5–19 ka. DBIS retreated on land by ~17–16 ka. Isolated ice caps in Scotland and Ireland persisted until ~14.5 ka. Early retreat of this marine-terminating margin is best explained by local ice loading increasing water depths and promoting calving ice losses rather than by changes in global temperatures. Topographical controls governed the differences between the ice-stream retreat from mid-shelf to the coast. Article in Journal/Newspaper Ice Sheet Sea ice University of St Andrews: Research Portal Journal of Quaternary Science 36 5 833 870 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Deglaciation Donegal Ice streams Malin Sea Retreat rate |
spellingShingle |
Deglaciation Donegal Ice streams Malin Sea Retreat rate Benetti, Sara Chiverrell, Richard C. Cofaigh, Colm Ó. Burke, Matt Medialdea, Alicia Small, David Ballantyne, Colin Bateman, Mark D. Callard, S. Louise Wilson, Peter Fabel, Derek Clark, Chris D. Arosio, Riccardo Bradley, Sarah Dunlop, Paul Ely, Jeremy C. Gales, Jenny Livingstone, Stephen J. Moreton, Steven G. Purcell, Catriona Saher, Margot Schiele, Kevin Van Landeghem, Katrien Weilbach, Kasper Exploring controls of the early and stepped deglaciation on the western margin of the British Irish Ice Sheet |
topic_facet |
Deglaciation Donegal Ice streams Malin Sea Retreat rate |
description |
New optically stimulated luminescence dating and Bayesian models integrating all legacy and BRITICE-CHRONO geochronology facilitated exploration of the controls on the deglaciation of two former sectors of the British–Irish Ice Sheet, the Donegal Bay (DBIS) and Malin Sea ice-streams (MSIS). Shelf-edge glaciation occurred ~27 ka, before the global Last Glacial Maximum, and shelf-wide retreat began 26–26.5 ka at a rate of ~18.7–20.7 m a –1 . MSIS grounding zone wedges and DBIS recessional moraines show episodic retreat punctuated by prolonged still-stands. By ~23–22 ka the outer shelf (~25 000 km 2 ) was free of grounded ice. After this time, MSIS retreat was faster (~20 m a –1 vs. ~2–6 m a –1 of DBIS). Separation of Irish and Scottish ice sources occurred ~20–19.5 ka, leaving an autonomous Donegal ice dome. Inner Malin shelf deglaciation followed the submarine troughs reaching the Hebridean coast ~19 ka. DBIS retreat formed the extensive complex of moraines in outer Donegal Bay at 20.5–19 ka. DBIS retreated on land by ~17–16 ka. Isolated ice caps in Scotland and Ireland persisted until ~14.5 ka. Early retreat of this marine-terminating margin is best explained by local ice loading increasing water depths and promoting calving ice losses rather than by changes in global temperatures. Topographical controls governed the differences between the ice-stream retreat from mid-shelf to the coast. |
format |
Article in Journal/Newspaper |
author |
Benetti, Sara Chiverrell, Richard C. Cofaigh, Colm Ó. Burke, Matt Medialdea, Alicia Small, David Ballantyne, Colin Bateman, Mark D. Callard, S. Louise Wilson, Peter Fabel, Derek Clark, Chris D. Arosio, Riccardo Bradley, Sarah Dunlop, Paul Ely, Jeremy C. Gales, Jenny Livingstone, Stephen J. Moreton, Steven G. Purcell, Catriona Saher, Margot Schiele, Kevin Van Landeghem, Katrien Weilbach, Kasper |
author_facet |
Benetti, Sara Chiverrell, Richard C. Cofaigh, Colm Ó. Burke, Matt Medialdea, Alicia Small, David Ballantyne, Colin Bateman, Mark D. Callard, S. Louise Wilson, Peter Fabel, Derek Clark, Chris D. Arosio, Riccardo Bradley, Sarah Dunlop, Paul Ely, Jeremy C. Gales, Jenny Livingstone, Stephen J. Moreton, Steven G. Purcell, Catriona Saher, Margot Schiele, Kevin Van Landeghem, Katrien Weilbach, Kasper |
author_sort |
Benetti, Sara |
title |
Exploring controls of the early and stepped deglaciation on the western margin of the British Irish Ice Sheet |
title_short |
Exploring controls of the early and stepped deglaciation on the western margin of the British Irish Ice Sheet |
title_full |
Exploring controls of the early and stepped deglaciation on the western margin of the British Irish Ice Sheet |
title_fullStr |
Exploring controls of the early and stepped deglaciation on the western margin of the British Irish Ice Sheet |
title_full_unstemmed |
Exploring controls of the early and stepped deglaciation on the western margin of the British Irish Ice Sheet |
title_sort |
exploring controls of the early and stepped deglaciation on the western margin of the british irish ice sheet |
publishDate |
2021 |
url |
https://risweb.st-andrews.ac.uk/portal/en/researchoutput/exploring-controls-of-the-early-and-stepped-deglaciation-on-the-western-margin-of-the-british-irish-ice-sheet(c24a50ec-c773-4b86-8cf9-f6622f7d26aa).html https://doi.org/10.1002/jqs.3315 https://research-repository.st-andrews.ac.uk/bitstream/10023/23305/1/Benetti_2021_JQS_Exploring_CC.pdf |
genre |
Ice Sheet Sea ice |
genre_facet |
Ice Sheet Sea ice |
op_source |
Benetti , S , Chiverrell , R C , Cofaigh , C Ó , Burke , M , Medialdea , A , Small , D , Ballantyne , C , Bateman , M D , Callard , S L , Wilson , P , Fabel , D , Clark , C D , Arosio , R , Bradley , S , Dunlop , P , Ely , J C , Gales , J , Livingstone , S J , Moreton , S G , Purcell , C , Saher , M , Schiele , K , Van Landeghem , K & Weilbach , K 2021 , ' Exploring controls of the early and stepped deglaciation on the western margin of the British Irish Ice Sheet ' , Journal of Quaternary Science , vol. Early View . https://doi.org/10.1002/jqs.3315 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/jqs.3315 |
container_title |
Journal of Quaternary Science |
container_volume |
36 |
container_issue |
5 |
container_start_page |
833 |
op_container_end_page |
870 |
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1766031046449561600 |