Mass transport deposits in the Donegal Barra Fan and their association with British–Irish Ice Sheet dynamics
This study analyses seismic data to investigate the kinematic indicators within the mass transport deposits (MTDs) of the Donegal Barra Fan complex in the Rockall Trough, along the NW European continental margin. Five episodes of mega-scale MTDs (DBF-01, -02, -03, -04 and -05) are identified. DBF-01...
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ftdatacite:10.6084/m9.figshare.c.4816911.v1 2023-05-15T16:40:32+02:00 Mass transport deposits in the Donegal Barra Fan and their association with British–Irish Ice Sheet dynamics Srikumar Roy Aggeliki Georgiopoulou Benetti, Sara Sacchetti, Fabio 2020 https://dx.doi.org/10.6084/m9.figshare.c.4816911.v1 https://geolsoc.figshare.com/collections/Mass_transport_deposits_in_the_Donegal_Barra_Fan_and_their_association_with_British_Irish_Ice_Sheet_dynamics/4816911/1 unknown Geological Society of London https://dx.doi.org/10.1144/sp500-2019-177 https://dx.doi.org/10.6084/m9.figshare.c.4816911 CC BY 4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Geology FOS Earth and related environmental sciences Collection article 2020 ftdatacite https://doi.org/10.6084/m9.figshare.c.4816911.v1 https://doi.org/10.1144/sp500-2019-177 https://doi.org/10.6084/m9.figshare.c.4816911 2021-11-05T12:55:41Z This study analyses seismic data to investigate the kinematic indicators within the mass transport deposits (MTDs) of the Donegal Barra Fan complex in the Rockall Trough, along the NW European continental margin. Five episodes of mega-scale MTDs (DBF-01, -02, -03, -04 and -05) are identified. DBF-01 is the largest MTD in the NW British continental margin, comprising 1907 km3 of sediments. Fold-and-thrusts were identified within the MTDs where they attain maximum thickness of c . 300–380 ms TWT, but not at the toe region. This indicates that local erosion and deceleration caused bulking up of the MTD volume, but the MTD was not fully arrested due to the high mobility of the mass flow. MTD thickness distribution and thrust fault orientations indicate source areas and flow direction of MTD. The MTDs show a compensational stacking pattern with earlier deposits influencing the position and flow direction of succeeding slides, suggesting that glaciogenic debris flows are sensitive to topographic variability. We propose that increased sediment input associated with at least five expansions of the British–Irish Ice Sheet to the shelf edge led to the development of these MTDs and that the youngest of them, DBF-05, corresponds to the Last Glacial Maximum. Article in Journal/Newspaper Ice Sheet DataCite Metadata Store (German National Library of Science and Technology) Rockall Trough ENVELOPE(-15.036,-15.036,53.825,53.825) Barra ENVELOPE(-61.417,-61.417,-64.367,-64.367) The Toe ENVELOPE(-59.167,-59.167,-62.333,-62.333) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Geology FOS Earth and related environmental sciences |
spellingShingle |
Geology FOS Earth and related environmental sciences Srikumar Roy Aggeliki Georgiopoulou Benetti, Sara Sacchetti, Fabio Mass transport deposits in the Donegal Barra Fan and their association with British–Irish Ice Sheet dynamics |
topic_facet |
Geology FOS Earth and related environmental sciences |
description |
This study analyses seismic data to investigate the kinematic indicators within the mass transport deposits (MTDs) of the Donegal Barra Fan complex in the Rockall Trough, along the NW European continental margin. Five episodes of mega-scale MTDs (DBF-01, -02, -03, -04 and -05) are identified. DBF-01 is the largest MTD in the NW British continental margin, comprising 1907 km3 of sediments. Fold-and-thrusts were identified within the MTDs where they attain maximum thickness of c . 300–380 ms TWT, but not at the toe region. This indicates that local erosion and deceleration caused bulking up of the MTD volume, but the MTD was not fully arrested due to the high mobility of the mass flow. MTD thickness distribution and thrust fault orientations indicate source areas and flow direction of MTD. The MTDs show a compensational stacking pattern with earlier deposits influencing the position and flow direction of succeeding slides, suggesting that glaciogenic debris flows are sensitive to topographic variability. We propose that increased sediment input associated with at least five expansions of the British–Irish Ice Sheet to the shelf edge led to the development of these MTDs and that the youngest of them, DBF-05, corresponds to the Last Glacial Maximum. |
format |
Article in Journal/Newspaper |
author |
Srikumar Roy Aggeliki Georgiopoulou Benetti, Sara Sacchetti, Fabio |
author_facet |
Srikumar Roy Aggeliki Georgiopoulou Benetti, Sara Sacchetti, Fabio |
author_sort |
Srikumar Roy |
title |
Mass transport deposits in the Donegal Barra Fan and their association with British–Irish Ice Sheet dynamics |
title_short |
Mass transport deposits in the Donegal Barra Fan and their association with British–Irish Ice Sheet dynamics |
title_full |
Mass transport deposits in the Donegal Barra Fan and their association with British–Irish Ice Sheet dynamics |
title_fullStr |
Mass transport deposits in the Donegal Barra Fan and their association with British–Irish Ice Sheet dynamics |
title_full_unstemmed |
Mass transport deposits in the Donegal Barra Fan and their association with British–Irish Ice Sheet dynamics |
title_sort |
mass transport deposits in the donegal barra fan and their association with british–irish ice sheet dynamics |
publisher |
Geological Society of London |
publishDate |
2020 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.4816911.v1 https://geolsoc.figshare.com/collections/Mass_transport_deposits_in_the_Donegal_Barra_Fan_and_their_association_with_British_Irish_Ice_Sheet_dynamics/4816911/1 |
long_lat |
ENVELOPE(-15.036,-15.036,53.825,53.825) ENVELOPE(-61.417,-61.417,-64.367,-64.367) ENVELOPE(-59.167,-59.167,-62.333,-62.333) |
geographic |
Rockall Trough Barra The Toe |
geographic_facet |
Rockall Trough Barra The Toe |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
https://dx.doi.org/10.1144/sp500-2019-177 https://dx.doi.org/10.6084/m9.figshare.c.4816911 |
op_rights |
CC BY 4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.4816911.v1 https://doi.org/10.1144/sp500-2019-177 https://doi.org/10.6084/m9.figshare.c.4816911 |
_version_ |
1766030945253588992 |