The Donegal ice dome, northwest Ireland: dimensions and chronology
Geomorphological evidence indicates that Donegal was formerly occupied by an ice dome that extended offshore to the west, northwest and north and was confluent with adjacent ice masses to the east and south. Erosive warm-based ice over-rode almost all the highest mountains, implying an ice-divide al...
Published in: | Journal of Quaternary Science |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2007
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Online Access: | https://research-portal.st-andrews.ac.uk/en/researchoutput/the-donegal-ice-dome-northwest-ireland-dimensions-and-chronology(2a40e84a-f381-4053-91f9-a065c646ecfc).html https://doi.org/10.1002/jqs.1116 http://www.scopus.com/inward/record.url?scp=37249002297&partnerID=8YFLogxK |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/2a40e84a-f381-4053-91f9-a065c646ecfc 2024-09-15T18:12:27+00:00 The Donegal ice dome, northwest Ireland: dimensions and chronology Ballantyne, Colin K. McCarroll, Danny Stone, John O. 2007-12 https://research-portal.st-andrews.ac.uk/en/researchoutput/the-donegal-ice-dome-northwest-ireland-dimensions-and-chronology(2a40e84a-f381-4053-91f9-a065c646ecfc).html https://doi.org/10.1002/jqs.1116 http://www.scopus.com/inward/record.url?scp=37249002297&partnerID=8YFLogxK eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/the-donegal-ice-dome-northwest-ireland-dimensions-and-chronology(2a40e84a-f381-4053-91f9-a065c646ecfc).html info:eu-repo/semantics/restrictedAccess Ballantyne , C K , McCarroll , D & Stone , J O 2007 , ' The Donegal ice dome, northwest Ireland: dimensions and chronology ' , Journal of Quaternary Science , vol. 22 , no. 8 , pp. 773-783 . https://doi.org/10.1002/jqs.1116 palaeonunataks cosmogenic isotope exposure dating clay-fraction mineralogy ice-sheet reconstruction LAST GLACIAL MAXIMUM IRISH SEA DEGLACIAL CHRONOLOGY OUTER HEBRIDES COUNTY DONEGAL SHEET SCOTLAND MOUNTAINS AGE RECONSTRUCTION article 2007 ftunstandrewcris https://doi.org/10.1002/jqs.1116 2024-06-26T23:33:42Z Geomorphological evidence indicates that Donegal was formerly occupied by an ice dome that extended offshore to the west, northwest and north and was confluent with adjacent ice masses to the east and south. Erosive warm-based ice over-rode almost all the highest mountains, implying an ice-divide altitude greater than 700m. Only six peripheral summits escaped glacial modification, implying either that they remained above the ice surface as nunataks or supported a thin cover of protective cold-based ice. Gibbsite, a pre-last glacial weathering product, is preferentially represented on summits that escaped glacial modification. Cosmogenic Be-10 exposure ages of 18.6 +/- 11.4 to 15.9 +/- 1.0 k yr for coastal sites confirm that Donegal ice extended offshore at the last glacial maximum. Reconstruction of the form of the Donegal ice dome suggests a former minimum ice thickness of similar to 500 m close to the present coastline in the west and northwest, and similar to 400 m near the coast of the Inishowen Peninsula in the north, with the ice extending at least 20 km across the adjacent shelf to the west and northwest. Copyright (C) 2007 John Wiley & Sons, Ltd. Article in Journal/Newspaper Ice Sheet University of St Andrews: Research Portal Journal of Quaternary Science 22 8 773 783 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
palaeonunataks cosmogenic isotope exposure dating clay-fraction mineralogy ice-sheet reconstruction LAST GLACIAL MAXIMUM IRISH SEA DEGLACIAL CHRONOLOGY OUTER HEBRIDES COUNTY DONEGAL SHEET SCOTLAND MOUNTAINS AGE RECONSTRUCTION |
spellingShingle |
palaeonunataks cosmogenic isotope exposure dating clay-fraction mineralogy ice-sheet reconstruction LAST GLACIAL MAXIMUM IRISH SEA DEGLACIAL CHRONOLOGY OUTER HEBRIDES COUNTY DONEGAL SHEET SCOTLAND MOUNTAINS AGE RECONSTRUCTION Ballantyne, Colin K. McCarroll, Danny Stone, John O. The Donegal ice dome, northwest Ireland: dimensions and chronology |
topic_facet |
palaeonunataks cosmogenic isotope exposure dating clay-fraction mineralogy ice-sheet reconstruction LAST GLACIAL MAXIMUM IRISH SEA DEGLACIAL CHRONOLOGY OUTER HEBRIDES COUNTY DONEGAL SHEET SCOTLAND MOUNTAINS AGE RECONSTRUCTION |
description |
Geomorphological evidence indicates that Donegal was formerly occupied by an ice dome that extended offshore to the west, northwest and north and was confluent with adjacent ice masses to the east and south. Erosive warm-based ice over-rode almost all the highest mountains, implying an ice-divide altitude greater than 700m. Only six peripheral summits escaped glacial modification, implying either that they remained above the ice surface as nunataks or supported a thin cover of protective cold-based ice. Gibbsite, a pre-last glacial weathering product, is preferentially represented on summits that escaped glacial modification. Cosmogenic Be-10 exposure ages of 18.6 +/- 11.4 to 15.9 +/- 1.0 k yr for coastal sites confirm that Donegal ice extended offshore at the last glacial maximum. Reconstruction of the form of the Donegal ice dome suggests a former minimum ice thickness of similar to 500 m close to the present coastline in the west and northwest, and similar to 400 m near the coast of the Inishowen Peninsula in the north, with the ice extending at least 20 km across the adjacent shelf to the west and northwest. Copyright (C) 2007 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Ballantyne, Colin K. McCarroll, Danny Stone, John O. |
author_facet |
Ballantyne, Colin K. McCarroll, Danny Stone, John O. |
author_sort |
Ballantyne, Colin K. |
title |
The Donegal ice dome, northwest Ireland: dimensions and chronology |
title_short |
The Donegal ice dome, northwest Ireland: dimensions and chronology |
title_full |
The Donegal ice dome, northwest Ireland: dimensions and chronology |
title_fullStr |
The Donegal ice dome, northwest Ireland: dimensions and chronology |
title_full_unstemmed |
The Donegal ice dome, northwest Ireland: dimensions and chronology |
title_sort |
donegal ice dome, northwest ireland: dimensions and chronology |
publishDate |
2007 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/the-donegal-ice-dome-northwest-ireland-dimensions-and-chronology(2a40e84a-f381-4053-91f9-a065c646ecfc).html https://doi.org/10.1002/jqs.1116 http://www.scopus.com/inward/record.url?scp=37249002297&partnerID=8YFLogxK |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Ballantyne , C K , McCarroll , D & Stone , J O 2007 , ' The Donegal ice dome, northwest Ireland: dimensions and chronology ' , Journal of Quaternary Science , vol. 22 , no. 8 , pp. 773-783 . https://doi.org/10.1002/jqs.1116 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/the-donegal-ice-dome-northwest-ireland-dimensions-and-chronology(2a40e84a-f381-4053-91f9-a065c646ecfc).html |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1002/jqs.1116 |
container_title |
Journal of Quaternary Science |
container_volume |
22 |
container_issue |
8 |
container_start_page |
773 |
op_container_end_page |
783 |
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1810450043807727616 |