A Late Pleistocene channelized subglacial meltwater system on the Atlantic continental shelf south of Ireland
The study of palaeo-glacial landforms and sediments can give insights into the nature and dynamics of ice sheets. This is particularly the case with regards to the subglacial record, which is challenging to observe in contemporary glaciated settings and hence remains only partially understood. The s...
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Online Access: | http://dro.dur.ac.uk/34792/ http://dro.dur.ac.uk/34792/1/34792.pdf http://dro.dur.ac.uk/34792/2/34792VoR.pdf https://doi.org/10.1111/bor.12536 |
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ftunivdurham:oai:dro.dur.ac.uk.OAI2:34792 2023-05-15T16:40:40+02:00 A Late Pleistocene channelized subglacial meltwater system on the Atlantic continental shelf south of Ireland Giglio, Cristiana Benetti, Sara Sacchetti, Fabio Lockhart, Edward Hughes Clarke, John Plets, Ruth Van Landeghem, Katrien Ó Cofaigh, Colm Scourse, James Dunlop, Paul 2022-01 application/pdf http://dro.dur.ac.uk/34792/ http://dro.dur.ac.uk/34792/1/34792.pdf http://dro.dur.ac.uk/34792/2/34792VoR.pdf https://doi.org/10.1111/bor.12536 unknown Wiley dro:34792 issn:0300-9483 issn: 1502-3885 doi:10.1111/bor.12536 http://dro.dur.ac.uk/34792/ https://doi.org/10.1111/bor.12536 http://dro.dur.ac.uk/34792/1/34792.pdf http://dro.dur.ac.uk/34792/2/34792VoR.pdf This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. CC-BY Boreas, 2022, Vol.51(1), pp.118-135 [Peer Reviewed Journal] Article PeerReviewed 2022 ftunivdurham https://doi.org/10.1111/bor.12536 2022-06-23T22:25:05Z The study of palaeo-glacial landforms and sediments can give insights into the nature and dynamics of ice sheets. This is particularly the case with regards to the subglacial record, which is challenging to observe in contemporary glaciated settings and hence remains only partially understood. The subglacial hydrological system is an essential component of ice dynamics, where increased water pressure enhances ice motion and sediment deformation, thus reducing ice-bed contact. Tunnel valleys are large, sinuous, steep-sided incisions that, together with smaller scale meltwater channels, indicate subglacial meltwater discharge beneath large ice sheets. Through the use of high-resolution marine geophysical data, a system of buried and exposed tunnel valleys, possible subglacial or proglacial meltwater channels and palaeo-fluvial valleys have been identified across the shelf of the Celtic Sea between Ireland and Britain. The presence of steep-sided and overdeepened tunnel valleys is indicative of a large channelized meltwater drainage system beneath the former Irish Sea Ice Stream, the most extensive ice stream to drain the last British–Irish Ice Sheet. After the rapid ice expansion across the Celtic Sea shelf around 28–26 ka, the tunnel valleys were carved into both bedrock and glacigenic sediments and are associated with rapid ice stream retreat northwards into the Irish Sea Basin between 25.6 and 24.3 ka. The presence of a major subglacial meltwater system on the relatively shallow shelf suggests that significant erosive meltwater discharge occurred during the last deglaciation and highlights the important contribution of meltwater to the retreat of the British–Irish Ice Sheet on the continental shelf. Article in Journal/Newspaper Ice Sheet Sea ice Durham University: Durham Research Online Boreas 51 1 118 135 |
institution |
Open Polar |
collection |
Durham University: Durham Research Online |
op_collection_id |
ftunivdurham |
language |
unknown |
description |
The study of palaeo-glacial landforms and sediments can give insights into the nature and dynamics of ice sheets. This is particularly the case with regards to the subglacial record, which is challenging to observe in contemporary glaciated settings and hence remains only partially understood. The subglacial hydrological system is an essential component of ice dynamics, where increased water pressure enhances ice motion and sediment deformation, thus reducing ice-bed contact. Tunnel valleys are large, sinuous, steep-sided incisions that, together with smaller scale meltwater channels, indicate subglacial meltwater discharge beneath large ice sheets. Through the use of high-resolution marine geophysical data, a system of buried and exposed tunnel valleys, possible subglacial or proglacial meltwater channels and palaeo-fluvial valleys have been identified across the shelf of the Celtic Sea between Ireland and Britain. The presence of steep-sided and overdeepened tunnel valleys is indicative of a large channelized meltwater drainage system beneath the former Irish Sea Ice Stream, the most extensive ice stream to drain the last British–Irish Ice Sheet. After the rapid ice expansion across the Celtic Sea shelf around 28–26 ka, the tunnel valleys were carved into both bedrock and glacigenic sediments and are associated with rapid ice stream retreat northwards into the Irish Sea Basin between 25.6 and 24.3 ka. The presence of a major subglacial meltwater system on the relatively shallow shelf suggests that significant erosive meltwater discharge occurred during the last deglaciation and highlights the important contribution of meltwater to the retreat of the British–Irish Ice Sheet on the continental shelf. |
format |
Article in Journal/Newspaper |
author |
Giglio, Cristiana Benetti, Sara Sacchetti, Fabio Lockhart, Edward Hughes Clarke, John Plets, Ruth Van Landeghem, Katrien Ó Cofaigh, Colm Scourse, James Dunlop, Paul |
spellingShingle |
Giglio, Cristiana Benetti, Sara Sacchetti, Fabio Lockhart, Edward Hughes Clarke, John Plets, Ruth Van Landeghem, Katrien Ó Cofaigh, Colm Scourse, James Dunlop, Paul A Late Pleistocene channelized subglacial meltwater system on the Atlantic continental shelf south of Ireland |
author_facet |
Giglio, Cristiana Benetti, Sara Sacchetti, Fabio Lockhart, Edward Hughes Clarke, John Plets, Ruth Van Landeghem, Katrien Ó Cofaigh, Colm Scourse, James Dunlop, Paul |
author_sort |
Giglio, Cristiana |
title |
A Late Pleistocene channelized subglacial meltwater system on the Atlantic continental shelf south of Ireland |
title_short |
A Late Pleistocene channelized subglacial meltwater system on the Atlantic continental shelf south of Ireland |
title_full |
A Late Pleistocene channelized subglacial meltwater system on the Atlantic continental shelf south of Ireland |
title_fullStr |
A Late Pleistocene channelized subglacial meltwater system on the Atlantic continental shelf south of Ireland |
title_full_unstemmed |
A Late Pleistocene channelized subglacial meltwater system on the Atlantic continental shelf south of Ireland |
title_sort |
late pleistocene channelized subglacial meltwater system on the atlantic continental shelf south of ireland |
publisher |
Wiley |
publishDate |
2022 |
url |
http://dro.dur.ac.uk/34792/ http://dro.dur.ac.uk/34792/1/34792.pdf http://dro.dur.ac.uk/34792/2/34792VoR.pdf https://doi.org/10.1111/bor.12536 |
genre |
Ice Sheet Sea ice |
genre_facet |
Ice Sheet Sea ice |
op_source |
Boreas, 2022, Vol.51(1), pp.118-135 [Peer Reviewed Journal] |
op_relation |
dro:34792 issn:0300-9483 issn: 1502-3885 doi:10.1111/bor.12536 http://dro.dur.ac.uk/34792/ https://doi.org/10.1111/bor.12536 http://dro.dur.ac.uk/34792/1/34792.pdf http://dro.dur.ac.uk/34792/2/34792VoR.pdf |
op_rights |
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1111/bor.12536 |
container_title |
Boreas |
container_volume |
51 |
container_issue |
1 |
container_start_page |
118 |
op_container_end_page |
135 |
_version_ |
1766031070611898368 |