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...
Main Authors: | , , , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier
2015
|
Subjects: | |
Online Access: | https://mural.maynoothuniversity.ie/8868/ https://mural.maynoothuniversity.ie/8868/1/SMcC_ice%20sheet%202015.pdf |
id |
ftunivmaynooth:oai:mural.maynoothuniversity.ie:8868 |
---|---|
record_format |
openpolar |
spelling |
ftunivmaynooth:oai:mural.maynoothuniversity.ie:8868 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 https://mural.maynoothuniversity.ie/8868/ https://mural.maynoothuniversity.ie/8868/1/SMcC_ice%20sheet%202015.pdf en eng Elsevier https://mural.maynoothuniversity.ie/8868/1/SMcC_ice%20sheet%202015.pdf Praeg, Daniel and McCarron, Stephen and Dove, Dayton and Ó Cofaigh, Colm and Scott, Gill and Monteys, Xavier and Facchin, Lorenzo and Romeo, Roberto and Coxon, Peter (2015) Ice sheet extension to the Celtic Sea shelf edge at the Last Glacial Maximum. Quaternary Science Reviews, 111. pp. 107-112. ISSN 0277-3791 Article PeerReviewed 2015 ftunivmaynooth 2022-06-13T18:45:33Z 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: over- consolidated 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 Maynooth University ePrints and eTheses Archive (National University of Ireland) Cockburn ENVELOPE(-62.295,-62.295,-64.018,-64.018) |
institution |
Open Polar |
collection |
Maynooth University ePrints and eTheses Archive (National University of Ireland) |
op_collection_id |
ftunivmaynooth |
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: over- consolidated 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 |
https://mural.maynoothuniversity.ie/8868/ https://mural.maynoothuniversity.ie/8868/1/SMcC_ice%20sheet%202015.pdf |
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://mural.maynoothuniversity.ie/8868/1/SMcC_ice%20sheet%202015.pdf Praeg, Daniel and McCarron, Stephen and Dove, Dayton and Ó Cofaigh, Colm and Scott, Gill and Monteys, Xavier and Facchin, Lorenzo and Romeo, Roberto and Coxon, Peter (2015) Ice sheet extension to the Celtic Sea shelf edge at the Last Glacial Maximum. Quaternary Science Reviews, 111. pp. 107-112. ISSN 0277-3791 |
_version_ |
1766030677796454400 |