Deep-water geomorphology of the glaciated Irish margin from high-resolution marine geophysical data
The continental margin offshore of western Ireland offers an opportunity to study the effects of glacial forcing on the morphology and sediment architecture of a mid-latitude margin. High resolution multibeam bathymetry and backscatter data, combined with shallow seismic and TOBI deep-towed side-sca...
Published in: | Marine Geology |
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Language: | English |
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2012
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Online Access: | https://research.brighton.ac.uk/en/publications/d5c0fbfe-a86a-452c-add9-a0ef2f8f4239 https://doi.org/10.1016/j.margeo.2011.11.011 http://www.scopus.com/inward/record.url?scp=84155183058&partnerID=8YFLogxK |
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ftunbrightoncris:oai:pure.atira.dk:publications/d5c0fbfe-a86a-452c-add9-a0ef2f8f4239 2023-05-15T16:40:16+02:00 Deep-water geomorphology of the glaciated Irish margin from high-resolution marine geophysical data Sacchetti, F. Benetti, S. Georgiopoulou, A. Shannon, P. M. O'Reilly, B. M. Dunlop, P. Quinn, R. Cofaigh, C. Ó 2012-01-01 https://research.brighton.ac.uk/en/publications/d5c0fbfe-a86a-452c-add9-a0ef2f8f4239 https://doi.org/10.1016/j.margeo.2011.11.011 http://www.scopus.com/inward/record.url?scp=84155183058&partnerID=8YFLogxK eng eng info:eu-repo/semantics/closedAccess Sacchetti , F , Benetti , S , Georgiopoulou , A , Shannon , P M , O'Reilly , B M , Dunlop , P , Quinn , R & Cofaigh , C Ó 2012 , ' Deep-water geomorphology of the glaciated Irish margin from high-resolution marine geophysical data ' , Marine Geology , vol. 291-294 , pp. 113-131 . https://doi.org/10.1016/j.margeo.2011.11.011 British-Irish Ice Sheet Canyons Geomorphology Marine geophysics Rockall Trough Slope article 2012 ftunbrightoncris https://doi.org/10.1016/j.margeo.2011.11.011 2022-01-01T08:47:56Z The continental margin offshore of western Ireland offers an opportunity to study the effects of glacial forcing on the morphology and sediment architecture of a mid-latitude margin. High resolution multibeam bathymetry and backscatter data, combined with shallow seismic and TOBI deep-towed side-scan sonar profiles, provide the basis for this study and allow a detailed geomorphological interpretation of the northwest Irish continental margin. Several features, including submarine mass failures, canyon systems and escarpments, are identified in the Rockall Trough for the first time. A new physiographic classification of the Irish margin is proposed and linked to the impact of glaciations along the margin. Correlation of the position and dimensions of moraines on the continental shelf with the level of canyon evolution suggests that the sediment and meltwater delivered by the British-Irish Ice Sheet played a fundamental role in shaping the margin including the upslope development of some of the canyon systems. The glacial influence is also suggested by the variable extent and backscatter signal of sedimentary lobes associated with the canyons. These lobes provide an indirect measurement of the amount of glaciogenic sediment delivered by the ice sheet into the Rockall Trough during the last glacial maximum. None of the sedimentary lobes demonstrates notable relief, indicating that the amount of glaciogenic sediment delivered by the British-Irish Ice Sheet into the Rockall Trough was limited. Their southward disappearance suggests a more restricted BIIS, which did not reach the shelf edge south of 54°23' N. The various slope styles observed on the Irish margin represent snapshots of the progressive stages of slope development for a glacially-influenced passive margin and may provide a predictive model for the evolution of other such margins. Article in Journal/Newspaper Ice Sheet The University of Brighton Research Portal Rockall Trough ENVELOPE(-15.036,-15.036,53.825,53.825) Marine Geology 291-294 113 131 |
institution |
Open Polar |
collection |
The University of Brighton Research Portal |
op_collection_id |
ftunbrightoncris |
language |
English |
topic |
British-Irish Ice Sheet Canyons Geomorphology Marine geophysics Rockall Trough Slope |
spellingShingle |
British-Irish Ice Sheet Canyons Geomorphology Marine geophysics Rockall Trough Slope Sacchetti, F. Benetti, S. Georgiopoulou, A. Shannon, P. M. O'Reilly, B. M. Dunlop, P. Quinn, R. Cofaigh, C. Ó Deep-water geomorphology of the glaciated Irish margin from high-resolution marine geophysical data |
topic_facet |
British-Irish Ice Sheet Canyons Geomorphology Marine geophysics Rockall Trough Slope |
description |
The continental margin offshore of western Ireland offers an opportunity to study the effects of glacial forcing on the morphology and sediment architecture of a mid-latitude margin. High resolution multibeam bathymetry and backscatter data, combined with shallow seismic and TOBI deep-towed side-scan sonar profiles, provide the basis for this study and allow a detailed geomorphological interpretation of the northwest Irish continental margin. Several features, including submarine mass failures, canyon systems and escarpments, are identified in the Rockall Trough for the first time. A new physiographic classification of the Irish margin is proposed and linked to the impact of glaciations along the margin. Correlation of the position and dimensions of moraines on the continental shelf with the level of canyon evolution suggests that the sediment and meltwater delivered by the British-Irish Ice Sheet played a fundamental role in shaping the margin including the upslope development of some of the canyon systems. The glacial influence is also suggested by the variable extent and backscatter signal of sedimentary lobes associated with the canyons. These lobes provide an indirect measurement of the amount of glaciogenic sediment delivered by the ice sheet into the Rockall Trough during the last glacial maximum. None of the sedimentary lobes demonstrates notable relief, indicating that the amount of glaciogenic sediment delivered by the British-Irish Ice Sheet into the Rockall Trough was limited. Their southward disappearance suggests a more restricted BIIS, which did not reach the shelf edge south of 54°23' N. The various slope styles observed on the Irish margin represent snapshots of the progressive stages of slope development for a glacially-influenced passive margin and may provide a predictive model for the evolution of other such margins. |
format |
Article in Journal/Newspaper |
author |
Sacchetti, F. Benetti, S. Georgiopoulou, A. Shannon, P. M. O'Reilly, B. M. Dunlop, P. Quinn, R. Cofaigh, C. Ó |
author_facet |
Sacchetti, F. Benetti, S. Georgiopoulou, A. Shannon, P. M. O'Reilly, B. M. Dunlop, P. Quinn, R. Cofaigh, C. Ó |
author_sort |
Sacchetti, F. |
title |
Deep-water geomorphology of the glaciated Irish margin from high-resolution marine geophysical data |
title_short |
Deep-water geomorphology of the glaciated Irish margin from high-resolution marine geophysical data |
title_full |
Deep-water geomorphology of the glaciated Irish margin from high-resolution marine geophysical data |
title_fullStr |
Deep-water geomorphology of the glaciated Irish margin from high-resolution marine geophysical data |
title_full_unstemmed |
Deep-water geomorphology of the glaciated Irish margin from high-resolution marine geophysical data |
title_sort |
deep-water geomorphology of the glaciated irish margin from high-resolution marine geophysical data |
publishDate |
2012 |
url |
https://research.brighton.ac.uk/en/publications/d5c0fbfe-a86a-452c-add9-a0ef2f8f4239 https://doi.org/10.1016/j.margeo.2011.11.011 http://www.scopus.com/inward/record.url?scp=84155183058&partnerID=8YFLogxK |
long_lat |
ENVELOPE(-15.036,-15.036,53.825,53.825) |
geographic |
Rockall Trough |
geographic_facet |
Rockall Trough |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Sacchetti , F , Benetti , S , Georgiopoulou , A , Shannon , P M , O'Reilly , B M , Dunlop , P , Quinn , R & Cofaigh , C Ó 2012 , ' Deep-water geomorphology of the glaciated Irish margin from high-resolution marine geophysical data ' , Marine Geology , vol. 291-294 , pp. 113-131 . https://doi.org/10.1016/j.margeo.2011.11.011 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.margeo.2011.11.011 |
container_title |
Marine Geology |
container_volume |
291-294 |
container_start_page |
113 |
op_container_end_page |
131 |
_version_ |
1766030644885848064 |