The advance and retreat of the Irish Sea Ice Stream in the Celtic Sea and its influence on shelf evolution
International audience The reconstruction of the largest ice stream to drain the British-Irish Ice Sheet at the Last Glacial Maximum (LGM) can provide essential palaeoglacial observations required for constraining numerical ice sheet models. The Irish Sea Ice Stream (ISIS) was long considered to hav...
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Language: | English |
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HAL CCSD
2019
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Online Access: | https://hal.science/hal-02363197 |
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ftunivcotedazur:oai:HAL:hal-02363197v1 |
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openpolar |
institution |
Open Polar |
collection |
HAL Université Côte d'Azur |
op_collection_id |
ftunivcotedazur |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy Lockhart, Edward Scourse, James Praeg, D van Landeghem, Katrien J.J. Mellett, Claire Saher, Margot Callard, Louise Chiverrell, Richard C. Benetti, Sara Cofaigh, Colm Ó Clark, Chris, A The advance and retreat of the Irish Sea Ice Stream in the Celtic Sea and its influence on shelf evolution |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy |
description |
International audience The reconstruction of the largest ice stream to drain the British-Irish Ice Sheet at the Last Glacial Maximum (LGM) can provide essential palaeoglacial observations required for constraining numerical ice sheet models. The Irish Sea Ice Stream (ISIS) was long considered to have terminated on the mid-shelf of the Celtic Sea, based on sediment cores and seismic data collected in the 1970s. Here we summarise findings from sediment cores and geophysical data acquired since 2009, and multi-beam bathymetric data acquired since 2001, which permit an updated evolution and palaeoglacial reconstruction of the Irish and UK sectors of the Celtic Sea shelf. In near-shore areas, multi-beam data reveal over 2000 glacial features, including moraine ridges, streamlined bedrock and meltwater channels, recording the southwest advance of the ISIS towards the shelf-edge and its subsequent retreat. The mid- to outer-shelf is characterised by the largest known linear shelf sediment ridges. These vary from long and linear features, the megaridges, in the northwest to sinuous and shorter ridges in the southeast. This ridge field was initially interpreted as tidal in origin, but glacigenic sediments have been recovered from the flanks of the megaridges. Correlating decimetric-resolution geophysical data to sediment cores, the megaridges comprise three main units. 1) A superficial fining-upward drape above an unconformity, inferred to record decreasing ocean energy during marine transgression. Underlying this drape is 2), the Melville Formation (MFm), which comprises the upper bulk of the megaridges, displaying dipping internal acoustic reflections and consisting of medium to coarse sand and gravel, characteristics that could be consistent with either a tidal or glacifluvial origin. The MFm unconformably overlies 3), the Upper Little Sole Formation (ULSFm), previously proposed to be of late Pliocene to early Pleistocene age, but is here shown to contain glacigenic sediments dated to the LGM. This stratigraphy ... |
author2 |
School of Ocean Sciences Menai Bridge Bangor University University of Exeter Géoazur (GEOAZUR 7329) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Sud ) Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS) Wessex Archaeology Salisbury Department of Geography (UNIVERSITé DE DURHAM) Durham University University of Liverpool School of Geography and Environmental Sciences University of Ulster Department of Geography Sheffield University of Sheffield Sheffield European Project: 656821,H2020,H2020-MSCA-IF-2014,SEAGAS(2016) |
format |
Conference Object |
author |
Lockhart, Edward Scourse, James Praeg, D van Landeghem, Katrien J.J. Mellett, Claire Saher, Margot Callard, Louise Chiverrell, Richard C. Benetti, Sara Cofaigh, Colm Ó Clark, Chris, A |
author_facet |
Lockhart, Edward Scourse, James Praeg, D van Landeghem, Katrien J.J. Mellett, Claire Saher, Margot Callard, Louise Chiverrell, Richard C. Benetti, Sara Cofaigh, Colm Ó Clark, Chris, A |
author_sort |
Lockhart, Edward |
title |
The advance and retreat of the Irish Sea Ice Stream in the Celtic Sea and its influence on shelf evolution |
title_short |
The advance and retreat of the Irish Sea Ice Stream in the Celtic Sea and its influence on shelf evolution |
title_full |
The advance and retreat of the Irish Sea Ice Stream in the Celtic Sea and its influence on shelf evolution |
title_fullStr |
The advance and retreat of the Irish Sea Ice Stream in the Celtic Sea and its influence on shelf evolution |
title_full_unstemmed |
The advance and retreat of the Irish Sea Ice Stream in the Celtic Sea and its influence on shelf evolution |
title_sort |
advance and retreat of the irish sea ice stream in the celtic sea and its influence on shelf evolution |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.science/hal-02363197 |
op_coverage |
Dublin, Ireland |
genre |
Ice Sheet Sea ice |
genre_facet |
Ice Sheet Sea ice |
op_source |
INQUA 2019 - 20th Congress of the International Union for Quaternary Research https://hal.science/hal-02363197 INQUA 2019 - 20th Congress of the International Union for Quaternary Research, Jul 2019, Dublin, Ireland. pp.abstract O-5060 http://www.inqua2019.org/ |
op_relation |
info:eu-repo/grantAgreement//656821/EU/Multi-disciplinary Comparison of Fluid Venting from Gas Hydrate Systems on the Mediterranean and Brazilian Continental Margins over Glacial-Interglacial Timescales/SEAGAS hal-02363197 https://hal.science/hal-02363197 |
_version_ |
1790601624964562944 |
spelling |
ftunivcotedazur:oai:HAL:hal-02363197v1 2024-02-11T10:04:52+01:00 The advance and retreat of the Irish Sea Ice Stream in the Celtic Sea and its influence on shelf evolution Lockhart, Edward Scourse, James Praeg, D van Landeghem, Katrien J.J. Mellett, Claire Saher, Margot Callard, Louise Chiverrell, Richard C. Benetti, Sara Cofaigh, Colm Ó Clark, Chris, A School of Ocean Sciences Menai Bridge Bangor University University of Exeter Géoazur (GEOAZUR 7329) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Sud ) Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS) Wessex Archaeology Salisbury Department of Geography (UNIVERSITé DE DURHAM) Durham University University of Liverpool School of Geography and Environmental Sciences University of Ulster Department of Geography Sheffield University of Sheffield Sheffield European Project: 656821,H2020,H2020-MSCA-IF-2014,SEAGAS(2016) Dublin, Ireland 2019-07-25 https://hal.science/hal-02363197 en eng HAL CCSD info:eu-repo/grantAgreement//656821/EU/Multi-disciplinary Comparison of Fluid Venting from Gas Hydrate Systems on the Mediterranean and Brazilian Continental Margins over Glacial-Interglacial Timescales/SEAGAS hal-02363197 https://hal.science/hal-02363197 INQUA 2019 - 20th Congress of the International Union for Quaternary Research https://hal.science/hal-02363197 INQUA 2019 - 20th Congress of the International Union for Quaternary Research, Jul 2019, Dublin, Ireland. pp.abstract O-5060 http://www.inqua2019.org/ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy info:eu-repo/semantics/conferenceObject Conference papers 2019 ftunivcotedazur 2024-01-16T23:44:40Z International audience The reconstruction of the largest ice stream to drain the British-Irish Ice Sheet at the Last Glacial Maximum (LGM) can provide essential palaeoglacial observations required for constraining numerical ice sheet models. The Irish Sea Ice Stream (ISIS) was long considered to have terminated on the mid-shelf of the Celtic Sea, based on sediment cores and seismic data collected in the 1970s. Here we summarise findings from sediment cores and geophysical data acquired since 2009, and multi-beam bathymetric data acquired since 2001, which permit an updated evolution and palaeoglacial reconstruction of the Irish and UK sectors of the Celtic Sea shelf. In near-shore areas, multi-beam data reveal over 2000 glacial features, including moraine ridges, streamlined bedrock and meltwater channels, recording the southwest advance of the ISIS towards the shelf-edge and its subsequent retreat. The mid- to outer-shelf is characterised by the largest known linear shelf sediment ridges. These vary from long and linear features, the megaridges, in the northwest to sinuous and shorter ridges in the southeast. This ridge field was initially interpreted as tidal in origin, but glacigenic sediments have been recovered from the flanks of the megaridges. Correlating decimetric-resolution geophysical data to sediment cores, the megaridges comprise three main units. 1) A superficial fining-upward drape above an unconformity, inferred to record decreasing ocean energy during marine transgression. Underlying this drape is 2), the Melville Formation (MFm), which comprises the upper bulk of the megaridges, displaying dipping internal acoustic reflections and consisting of medium to coarse sand and gravel, characteristics that could be consistent with either a tidal or glacifluvial origin. The MFm unconformably overlies 3), the Upper Little Sole Formation (ULSFm), previously proposed to be of late Pliocene to early Pleistocene age, but is here shown to contain glacigenic sediments dated to the LGM. This stratigraphy ... Conference Object Ice Sheet Sea ice HAL Université Côte d'Azur |