Ice sheet extension to the Celtic Sea shelf edge at the Last Glacial Maximum
Previous reconstructions of the British–Irish Ice Sheet (BIIS) envisage ice streaming from the Irish Sea to the Celtic Sea at the Last Glacial Maximum, to a limit on the mid-shelf of the Irish-UK sectors. We present evidence from sediment cores and geophysical profiles that the BIIS extended 150 km...
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Online Access: | http://nora.nerc.ac.uk/id/eprint/511244/ https://nora.nerc.ac.uk/id/eprint/511244/1/JQSR-D-14-00361R1.pdf https://doi.org/10.1016/j.quascirev.2014.12.010 |
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ftnerc:oai:nora.nerc.ac.uk:511244 2023-05-15T16:40:17+02:00 Ice sheet extension to the Celtic Sea shelf edge at the Last Glacial Maximum Praeg, Daniel McCarron, Stephen Dove, Dayton Ó Cofaigh, Colm Scott, Gill Monteys, Xavier Facchin, Lorenzo Romeo, Roberto Coxon, Peter 2015 text http://nora.nerc.ac.uk/id/eprint/511244/ https://nora.nerc.ac.uk/id/eprint/511244/1/JQSR-D-14-00361R1.pdf https://doi.org/10.1016/j.quascirev.2014.12.010 en eng Elsevier https://nora.nerc.ac.uk/id/eprint/511244/1/JQSR-D-14-00361R1.pdf Praeg, Daniel; McCarron, Stephen; Dove, Dayton; Ó Cofaigh, Colm; Scott, Gill; Monteys, Xavier; Facchin, Lorenzo; Romeo, Roberto; Coxon, Peter. 2015 Ice sheet extension to the Celtic Sea shelf edge at the Last Glacial Maximum. Quaternary Science Reviews, 111. 107-112. https://doi.org/10.1016/j.quascirev.2014.12.010 <https://doi.org/10.1016/j.quascirev.2014.12.010> Publication - Article PeerReviewed 2015 ftnerc https://doi.org/10.1016/j.quascirev.2014.12.010 2023-02-04T19:41:49Z Previous reconstructions of the British–Irish Ice Sheet (BIIS) envisage ice streaming from the Irish Sea to the Celtic Sea at the Last Glacial Maximum, to a limit on the mid-shelf of the Irish-UK sectors. We present evidence from sediment cores and geophysical profiles that the BIIS extended 150 km farther seaward to reach the continental shelf edge. Three cores recently acquired from the flank of outer Cockburn Bank, a shelf-crossing sediment ridge, terminated in an eroded glacigenic layer including two facies: overconsolidated stratified diamicts; and finely-bedded muddy sand containing micro- and macrofossil species of cold water affinities. We interpret these facies to result from subglacial deformation and glacimarine deposition from turbid meltwater plumes. A date of 24,265 ± 195 cal BP on a chipped but unabraded mollusc valve in the glacimarine sediments indicates withdrawal of a tidewater ice sheet margin from the shelf edge by this time, consistent with evidence from deep-sea cores for ice-rafted debris peaks of Celtic Sea provenance between 25.5 and 23.4 ka BP. Together with terrestrial evidence, this supports rapid (ca 2 ka) purging of the BIIS by an ice stream that advanced from the Irish Sea to the shelf edge and collapsed back during Heinrich event 2. Article in Journal/Newspaper Ice Sheet Natural Environment Research Council: NERC Open Research Archive Cockburn ENVELOPE(-62.295,-62.295,-64.018,-64.018) Quaternary Science Reviews 111 107 112 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Previous reconstructions of the British–Irish Ice Sheet (BIIS) envisage ice streaming from the Irish Sea to the Celtic Sea at the Last Glacial Maximum, to a limit on the mid-shelf of the Irish-UK sectors. We present evidence from sediment cores and geophysical profiles that the BIIS extended 150 km farther seaward to reach the continental shelf edge. Three cores recently acquired from the flank of outer Cockburn Bank, a shelf-crossing sediment ridge, terminated in an eroded glacigenic layer including two facies: overconsolidated stratified diamicts; and finely-bedded muddy sand containing micro- and macrofossil species of cold water affinities. We interpret these facies to result from subglacial deformation and glacimarine deposition from turbid meltwater plumes. A date of 24,265 ± 195 cal BP on a chipped but unabraded mollusc valve in the glacimarine sediments indicates withdrawal of a tidewater ice sheet margin from the shelf edge by this time, consistent with evidence from deep-sea cores for ice-rafted debris peaks of Celtic Sea provenance between 25.5 and 23.4 ka BP. Together with terrestrial evidence, this supports rapid (ca 2 ka) purging of the BIIS by an ice stream that advanced from the Irish Sea to the shelf edge and collapsed back during Heinrich event 2. |
format |
Article in Journal/Newspaper |
author |
Praeg, Daniel McCarron, Stephen Dove, Dayton Ó Cofaigh, Colm Scott, Gill Monteys, Xavier Facchin, Lorenzo Romeo, Roberto Coxon, Peter |
spellingShingle |
Praeg, Daniel McCarron, Stephen Dove, Dayton Ó Cofaigh, Colm Scott, Gill Monteys, Xavier Facchin, Lorenzo Romeo, Roberto Coxon, Peter Ice sheet extension to the Celtic Sea shelf edge at the Last Glacial Maximum |
author_facet |
Praeg, Daniel McCarron, Stephen Dove, Dayton Ó Cofaigh, Colm Scott, Gill Monteys, Xavier Facchin, Lorenzo Romeo, Roberto Coxon, Peter |
author_sort |
Praeg, Daniel |
title |
Ice sheet extension to the Celtic Sea shelf edge at the Last Glacial Maximum |
title_short |
Ice sheet extension to the Celtic Sea shelf edge at the Last Glacial Maximum |
title_full |
Ice sheet extension to the Celtic Sea shelf edge at the Last Glacial Maximum |
title_fullStr |
Ice sheet extension to the Celtic Sea shelf edge at the Last Glacial Maximum |
title_full_unstemmed |
Ice sheet extension to the Celtic Sea shelf edge at the Last Glacial Maximum |
title_sort |
ice sheet extension to the celtic sea shelf edge at the last glacial maximum |
publisher |
Elsevier |
publishDate |
2015 |
url |
http://nora.nerc.ac.uk/id/eprint/511244/ https://nora.nerc.ac.uk/id/eprint/511244/1/JQSR-D-14-00361R1.pdf https://doi.org/10.1016/j.quascirev.2014.12.010 |
long_lat |
ENVELOPE(-62.295,-62.295,-64.018,-64.018) |
geographic |
Cockburn |
geographic_facet |
Cockburn |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
https://nora.nerc.ac.uk/id/eprint/511244/1/JQSR-D-14-00361R1.pdf Praeg, Daniel; McCarron, Stephen; Dove, Dayton; Ó Cofaigh, Colm; Scott, Gill; Monteys, Xavier; Facchin, Lorenzo; Romeo, Roberto; Coxon, Peter. 2015 Ice sheet extension to the Celtic Sea shelf edge at the Last Glacial Maximum. Quaternary Science Reviews, 111. 107-112. https://doi.org/10.1016/j.quascirev.2014.12.010 <https://doi.org/10.1016/j.quascirev.2014.12.010> |
op_doi |
https://doi.org/10.1016/j.quascirev.2014.12.010 |
container_title |
Quaternary Science Reviews |
container_volume |
111 |
container_start_page |
107 |
op_container_end_page |
112 |
_version_ |
1766030676029603840 |