Deglaciation chronology of the Donegal Ice Centre, north‐west Ireland
ABSTRACT During the Last Glacial Maximum, Donegal in north‐west Ireland functioned as an independent centre of ice dispersal that separated and fed into the Donegal Bay Ice Lobe (sourced in the Irish Midlands) to the south and the Hebrides/Malin Sea Ice Stream to the north. We report geochronologica...
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crwiley:10.1002/jqs.3077 2024-09-09T19:45:16+00:00 Deglaciation chronology of the Donegal Ice Centre, north‐west Ireland Wilson, Peter Ballantyne, Colin K. Benetti, Sara Small, David Fabel, Derek Clark, Chris D. Natural Environment Research Council 2018 http://dx.doi.org/10.1002/jqs.3077 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.3077 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3077 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/jqs.3077 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Journal of Quaternary Science volume 34, issue 1, page 16-28 ISSN 0267-8179 1099-1417 journal-article 2018 crwiley https://doi.org/10.1002/jqs.3077 2024-06-18T04:11:06Z ABSTRACT During the Last Glacial Maximum, Donegal in north‐west Ireland functioned as an independent centre of ice dispersal that separated and fed into the Donegal Bay Ice Lobe (sourced in the Irish Midlands) to the south and the Hebrides/Malin Sea Ice Stream to the north. We report geochronological data that demonstrate marked contrasts in the timing and rate of deglaciation in northern and southern Donegal. In northern Donegal, which occupied an inter‐ice‐stream/lobe location, decoupling from the Hebrides/Malin Sea Ice Stream resulted in formation of a marine embayment along the north coast by ∼22–21 ka, and subsequent slow (∼4 ± 1 m a −1 ) climatically driven inland retreat of the ice margin to mountain source areas by ∼17 ka. By contrast, in southern Donegal, which lay near the axis of the Donegal Bay Ice Lobe, deglaciation was delayed until ∼18 ka following readvance of ice to a moraine in outer Donegal Bay. The ice margin subsequently underwent net retreat, apparently uninterrupted by readvances, at a net rate of ∼ 18 ± 6 m a −1 . A mean terrestrial cosmogenic nuclide age of ∼15.0 ka obtained for samples from the foothills of the Blue Stack Mountains in south‐east Donegal indicates that ice persisted in valley heads and cirques at the beginning of the Lateglacial Interstadial, suggesting that these and nearby mountains supported the last remnants of the Irish Ice Sheet before complete deglaciation of Ireland, and that almost all the shrinkage of the ice sheet in this sector occurred under stadial conditions before the onset of interstadial warming at ∼14.7 ka. Article in Journal/Newspaper Ice Sheet Sea ice Wiley Online Library Journal of Quaternary Science 34 1 16 28 |
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Wiley Online Library |
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crwiley |
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English |
description |
ABSTRACT During the Last Glacial Maximum, Donegal in north‐west Ireland functioned as an independent centre of ice dispersal that separated and fed into the Donegal Bay Ice Lobe (sourced in the Irish Midlands) to the south and the Hebrides/Malin Sea Ice Stream to the north. We report geochronological data that demonstrate marked contrasts in the timing and rate of deglaciation in northern and southern Donegal. In northern Donegal, which occupied an inter‐ice‐stream/lobe location, decoupling from the Hebrides/Malin Sea Ice Stream resulted in formation of a marine embayment along the north coast by ∼22–21 ka, and subsequent slow (∼4 ± 1 m a −1 ) climatically driven inland retreat of the ice margin to mountain source areas by ∼17 ka. By contrast, in southern Donegal, which lay near the axis of the Donegal Bay Ice Lobe, deglaciation was delayed until ∼18 ka following readvance of ice to a moraine in outer Donegal Bay. The ice margin subsequently underwent net retreat, apparently uninterrupted by readvances, at a net rate of ∼ 18 ± 6 m a −1 . A mean terrestrial cosmogenic nuclide age of ∼15.0 ka obtained for samples from the foothills of the Blue Stack Mountains in south‐east Donegal indicates that ice persisted in valley heads and cirques at the beginning of the Lateglacial Interstadial, suggesting that these and nearby mountains supported the last remnants of the Irish Ice Sheet before complete deglaciation of Ireland, and that almost all the shrinkage of the ice sheet in this sector occurred under stadial conditions before the onset of interstadial warming at ∼14.7 ka. |
author2 |
Natural Environment Research Council |
format |
Article in Journal/Newspaper |
author |
Wilson, Peter Ballantyne, Colin K. Benetti, Sara Small, David Fabel, Derek Clark, Chris D. |
spellingShingle |
Wilson, Peter Ballantyne, Colin K. Benetti, Sara Small, David Fabel, Derek Clark, Chris D. Deglaciation chronology of the Donegal Ice Centre, north‐west Ireland |
author_facet |
Wilson, Peter Ballantyne, Colin K. Benetti, Sara Small, David Fabel, Derek Clark, Chris D. |
author_sort |
Wilson, Peter |
title |
Deglaciation chronology of the Donegal Ice Centre, north‐west Ireland |
title_short |
Deglaciation chronology of the Donegal Ice Centre, north‐west Ireland |
title_full |
Deglaciation chronology of the Donegal Ice Centre, north‐west Ireland |
title_fullStr |
Deglaciation chronology of the Donegal Ice Centre, north‐west Ireland |
title_full_unstemmed |
Deglaciation chronology of the Donegal Ice Centre, north‐west Ireland |
title_sort |
deglaciation chronology of the donegal ice centre, north‐west ireland |
publisher |
Wiley |
publishDate |
2018 |
url |
http://dx.doi.org/10.1002/jqs.3077 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.3077 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3077 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/jqs.3077 |
genre |
Ice Sheet Sea ice |
genre_facet |
Ice Sheet Sea ice |
op_source |
Journal of Quaternary Science volume 34, issue 1, page 16-28 ISSN 0267-8179 1099-1417 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/jqs.3077 |
container_title |
Journal of Quaternary Science |
container_volume |
34 |
container_issue |
1 |
container_start_page |
16 |
op_container_end_page |
28 |
_version_ |
1809914883317170176 |