Exposure-age constraints on the extent, timing and rate of retreat of the last Irish Sea ice stream
We report 23 cosmogenic isotope exposure ages (10Be and 36Cl) relating to the maximum extent and deglaciation chronology of the Irish Sea Ice Stream (ISIS), which drained the SW sector of the last British-Irish Ice Sheet. These show that the ISIS failed to reach the Preseli Hills of North Pembrokesh...
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ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/57157 2024-01-14T10:07:42+01:00 Exposure-age constraints on the extent, timing and rate of retreat of the last Irish Sea ice stream McCarroll, Danny Stone, John O Ballantyne, Colin K. Scourse, James D Fifield, L Keith Evans, David J A Hiemstra, John F http://hdl.handle.net/1885/57157 https://doi.org/10.1016/j.quascirev.2010.04.002 https://openresearch-repository.anu.edu.au/bitstream/1885/57157/5/ANUP_1937.pdf.jpg https://openresearch-repository.anu.edu.au/bitstream/1885/57157/7/01_McCarroll_Exposure-age_constraints_on_2010.pdf.jpg unknown Pergamon-Elsevier Ltd 0277-3791 http://hdl.handle.net/1885/57157 doi:10.1016/j.quascirev.2010.04.002 https://openresearch-repository.anu.edu.au/bitstream/1885/57157/5/ANUP_1937.pdf.jpg https://openresearch-repository.anu.edu.au/bitstream/1885/57157/7/01_McCarroll_Exposure-age_constraints_on_2010.pdf.jpg Quaternary Science Reviews Keywords: Age constraints British-Irish ice sheet Cosmogenic isotopes Deglaciations England Exposure age Ice streams Irish Sea Last Glacial Maximum Lateglacial Reorganisation Scotland Sea level rise Source area Glaciers Hydraulics Isotopes Sea ice Journal article ftanucanberra https://doi.org/10.1016/j.quascirev.2010.04.002 2023-12-15T09:34:12Z We report 23 cosmogenic isotope exposure ages (10Be and 36Cl) relating to the maximum extent and deglaciation chronology of the Irish Sea Ice Stream (ISIS), which drained the SW sector of the last British-Irish Ice Sheet. These show that the ISIS failed to reach the Preseli Hills of North Pembrokeshire yet extended southwards to impinge on northern Isles of Scilly (50°N) during the last glacial maximum. Four samples from western Anglesey demonstrate deglaciation of the southern Irish Sea Basin by c. 20-18 ka, and two from the Llŷn Peninsula in northwest Wales, if valid, suggest deglaciation by c. 23-22 ka followed by gradual oscillatory northwards retreat of the ice margin for over 3000 years. An alternative interpretation of our data suggests that ice reached Scilly as late as 22-21 ka then retreated 450 km northwards within the following three millennia, possibly in response to sea level rise and/or intrinsic reorganisation within the last British-Irish Ice Sheet. Samples from upland source areas of the ISIS in NW England and SW Scotland produced exposure ages ≤14.3 ka, suggesting possible persistence of ice in such areas into the Lateglacial Interstade of 14.7-12.9 ka. Article in Journal/Newspaper Ice Sheet Sea ice Australian National University: ANU Digital Collections Quaternary Science Reviews 29 15-16 1844 1852 |
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Open Polar |
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Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
unknown |
topic |
Keywords: Age constraints British-Irish ice sheet Cosmogenic isotopes Deglaciations England Exposure age Ice streams Irish Sea Last Glacial Maximum Lateglacial Reorganisation Scotland Sea level rise Source area Glaciers Hydraulics Isotopes Sea ice |
spellingShingle |
Keywords: Age constraints British-Irish ice sheet Cosmogenic isotopes Deglaciations England Exposure age Ice streams Irish Sea Last Glacial Maximum Lateglacial Reorganisation Scotland Sea level rise Source area Glaciers Hydraulics Isotopes Sea ice McCarroll, Danny Stone, John O Ballantyne, Colin K. Scourse, James D Fifield, L Keith Evans, David J A Hiemstra, John F Exposure-age constraints on the extent, timing and rate of retreat of the last Irish Sea ice stream |
topic_facet |
Keywords: Age constraints British-Irish ice sheet Cosmogenic isotopes Deglaciations England Exposure age Ice streams Irish Sea Last Glacial Maximum Lateglacial Reorganisation Scotland Sea level rise Source area Glaciers Hydraulics Isotopes Sea ice |
description |
We report 23 cosmogenic isotope exposure ages (10Be and 36Cl) relating to the maximum extent and deglaciation chronology of the Irish Sea Ice Stream (ISIS), which drained the SW sector of the last British-Irish Ice Sheet. These show that the ISIS failed to reach the Preseli Hills of North Pembrokeshire yet extended southwards to impinge on northern Isles of Scilly (50°N) during the last glacial maximum. Four samples from western Anglesey demonstrate deglaciation of the southern Irish Sea Basin by c. 20-18 ka, and two from the Llŷn Peninsula in northwest Wales, if valid, suggest deglaciation by c. 23-22 ka followed by gradual oscillatory northwards retreat of the ice margin for over 3000 years. An alternative interpretation of our data suggests that ice reached Scilly as late as 22-21 ka then retreated 450 km northwards within the following three millennia, possibly in response to sea level rise and/or intrinsic reorganisation within the last British-Irish Ice Sheet. Samples from upland source areas of the ISIS in NW England and SW Scotland produced exposure ages ≤14.3 ka, suggesting possible persistence of ice in such areas into the Lateglacial Interstade of 14.7-12.9 ka. |
format |
Article in Journal/Newspaper |
author |
McCarroll, Danny Stone, John O Ballantyne, Colin K. Scourse, James D Fifield, L Keith Evans, David J A Hiemstra, John F |
author_facet |
McCarroll, Danny Stone, John O Ballantyne, Colin K. Scourse, James D Fifield, L Keith Evans, David J A Hiemstra, John F |
author_sort |
McCarroll, Danny |
title |
Exposure-age constraints on the extent, timing and rate of retreat of the last Irish Sea ice stream |
title_short |
Exposure-age constraints on the extent, timing and rate of retreat of the last Irish Sea ice stream |
title_full |
Exposure-age constraints on the extent, timing and rate of retreat of the last Irish Sea ice stream |
title_fullStr |
Exposure-age constraints on the extent, timing and rate of retreat of the last Irish Sea ice stream |
title_full_unstemmed |
Exposure-age constraints on the extent, timing and rate of retreat of the last Irish Sea ice stream |
title_sort |
exposure-age constraints on the extent, timing and rate of retreat of the last irish sea ice stream |
publisher |
Pergamon-Elsevier Ltd |
url |
http://hdl.handle.net/1885/57157 https://doi.org/10.1016/j.quascirev.2010.04.002 https://openresearch-repository.anu.edu.au/bitstream/1885/57157/5/ANUP_1937.pdf.jpg https://openresearch-repository.anu.edu.au/bitstream/1885/57157/7/01_McCarroll_Exposure-age_constraints_on_2010.pdf.jpg |
genre |
Ice Sheet Sea ice |
genre_facet |
Ice Sheet Sea ice |
op_source |
Quaternary Science Reviews |
op_relation |
0277-3791 http://hdl.handle.net/1885/57157 doi:10.1016/j.quascirev.2010.04.002 https://openresearch-repository.anu.edu.au/bitstream/1885/57157/5/ANUP_1937.pdf.jpg https://openresearch-repository.anu.edu.au/bitstream/1885/57157/7/01_McCarroll_Exposure-age_constraints_on_2010.pdf.jpg |
op_doi |
https://doi.org/10.1016/j.quascirev.2010.04.002 |
container_title |
Quaternary Science Reviews |
container_volume |
29 |
container_issue |
15-16 |
container_start_page |
1844 |
op_container_end_page |
1852 |
_version_ |
1788062097696882688 |