Subglacial processes on an Antarctic ice stream bed 1: sediment transport and bedform genesis inferred from marine geophysics
The spatial pattern and morphometry of bedforms and their relationship to sediment thickness have been analysed in the Marguerite Bay Palaeo-ice stream Trough, western Antarctic Peninsula. Over 17 000 glacial landforms were measured from geophysical datasets, and sediment thickness maps were generat...
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ftnerc:oai:nora.nerc.ac.uk:510088 2023-05-15T13:49:32+02:00 Subglacial processes on an Antarctic ice stream bed 1: sediment transport and bedform genesis inferred from marine geophysics Livingstone, Stewart J. Stokes, Chris R. Ó Cofaigh, Colm Hillenbrand, Claus-Dieter Vieli, Andreas Jamieson, Stewart S.R. Spagnolo, Matteo Dowdeswell, Julian 2016-04 text http://nora.nerc.ac.uk/id/eprint/510088/ https://nora.nerc.ac.uk/id/eprint/510088/1/Livinstone.pdf http://journals.cambridge.org/action/displayAbstract?aid=10242060&next=true&volumeId=-1&issueId=-1 en eng Cambridge Journals https://nora.nerc.ac.uk/id/eprint/510088/1/Livinstone.pdf Livingstone, Stewart J.; Stokes, Chris R.; Ó Cofaigh, Colm; Hillenbrand, Claus-Dieter orcid:0000-0003-0240-7317 Vieli, Andreas; Jamieson, Stewart S.R.; Spagnolo, Matteo; Dowdeswell, Julian. 2016 Subglacial processes on an Antarctic ice stream bed 1: sediment transport and bedform genesis inferred from marine geophysics. Journal of Glaciology, 62 (232). 270-284. https://doi.org/10.1017/jog.2016.18 <https://doi.org/10.1017/jog.2016.18> cc_by_4 CC-BY Publication - Article PeerReviewed 2016 ftnerc https://doi.org/10.1017/jog.2016.18 2023-02-04T19:41:12Z The spatial pattern and morphometry of bedforms and their relationship to sediment thickness have been analysed in the Marguerite Bay Palaeo-ice stream Trough, western Antarctic Peninsula. Over 17 000 glacial landforms were measured from geophysical datasets, and sediment thickness maps were generated from acoustic sub-bottom profiler data. These analyses reveal a complex bedform pattern characterised by considerable spatial diversity, influenced heavily by the underlying substrate. The variability in length and density of mega-scale lineations indicates an evolving bedform signature, whereby landforms are preserved at different stages of maturity. Lineation generation and attenuation is associated with regions of thick, soft till where deformation was likely to be the greatest. The distribution of soft till and the localised extent of grounding-zone wedges (GZWs) indicate a dynamic sedimentary system characterised by considerable spatio-temporal variability in sediment erosion, transport and deposition. Formation of GZWs on the outer shelf of Marguerite Trough, within the error range of the radiocarbon dates, requires large sediment fluxes (upwards of 1000 m3 a−1 (m grounding line width)−1), and a >1 m thick mobile till layer, or rapid basal sliding velocities (upwards of 6 km a−1). Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Journal of Glaciology Natural Environment Research Council: NERC Open Research Archive Antarctic Antarctic Peninsula Marguerite ENVELOPE(141.378,141.378,-66.787,-66.787) Marguerite Bay ENVELOPE(-68.000,-68.000,-68.500,-68.500) Journal of Glaciology 62 232 270 284 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
The spatial pattern and morphometry of bedforms and their relationship to sediment thickness have been analysed in the Marguerite Bay Palaeo-ice stream Trough, western Antarctic Peninsula. Over 17 000 glacial landforms were measured from geophysical datasets, and sediment thickness maps were generated from acoustic sub-bottom profiler data. These analyses reveal a complex bedform pattern characterised by considerable spatial diversity, influenced heavily by the underlying substrate. The variability in length and density of mega-scale lineations indicates an evolving bedform signature, whereby landforms are preserved at different stages of maturity. Lineation generation and attenuation is associated with regions of thick, soft till where deformation was likely to be the greatest. The distribution of soft till and the localised extent of grounding-zone wedges (GZWs) indicate a dynamic sedimentary system characterised by considerable spatio-temporal variability in sediment erosion, transport and deposition. Formation of GZWs on the outer shelf of Marguerite Trough, within the error range of the radiocarbon dates, requires large sediment fluxes (upwards of 1000 m3 a−1 (m grounding line width)−1), and a >1 m thick mobile till layer, or rapid basal sliding velocities (upwards of 6 km a−1). |
format |
Article in Journal/Newspaper |
author |
Livingstone, Stewart J. Stokes, Chris R. Ó Cofaigh, Colm Hillenbrand, Claus-Dieter Vieli, Andreas Jamieson, Stewart S.R. Spagnolo, Matteo Dowdeswell, Julian |
spellingShingle |
Livingstone, Stewart J. Stokes, Chris R. Ó Cofaigh, Colm Hillenbrand, Claus-Dieter Vieli, Andreas Jamieson, Stewart S.R. Spagnolo, Matteo Dowdeswell, Julian Subglacial processes on an Antarctic ice stream bed 1: sediment transport and bedform genesis inferred from marine geophysics |
author_facet |
Livingstone, Stewart J. Stokes, Chris R. Ó Cofaigh, Colm Hillenbrand, Claus-Dieter Vieli, Andreas Jamieson, Stewart S.R. Spagnolo, Matteo Dowdeswell, Julian |
author_sort |
Livingstone, Stewart J. |
title |
Subglacial processes on an Antarctic ice stream bed 1: sediment transport and bedform genesis inferred from marine geophysics |
title_short |
Subglacial processes on an Antarctic ice stream bed 1: sediment transport and bedform genesis inferred from marine geophysics |
title_full |
Subglacial processes on an Antarctic ice stream bed 1: sediment transport and bedform genesis inferred from marine geophysics |
title_fullStr |
Subglacial processes on an Antarctic ice stream bed 1: sediment transport and bedform genesis inferred from marine geophysics |
title_full_unstemmed |
Subglacial processes on an Antarctic ice stream bed 1: sediment transport and bedform genesis inferred from marine geophysics |
title_sort |
subglacial processes on an antarctic ice stream bed 1: sediment transport and bedform genesis inferred from marine geophysics |
publisher |
Cambridge Journals |
publishDate |
2016 |
url |
http://nora.nerc.ac.uk/id/eprint/510088/ https://nora.nerc.ac.uk/id/eprint/510088/1/Livinstone.pdf http://journals.cambridge.org/action/displayAbstract?aid=10242060&next=true&volumeId=-1&issueId=-1 |
long_lat |
ENVELOPE(141.378,141.378,-66.787,-66.787) ENVELOPE(-68.000,-68.000,-68.500,-68.500) |
geographic |
Antarctic Antarctic Peninsula Marguerite Marguerite Bay |
geographic_facet |
Antarctic Antarctic Peninsula Marguerite Marguerite Bay |
genre |
Antarc* Antarctic Antarctic Peninsula Journal of Glaciology |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Journal of Glaciology |
op_relation |
https://nora.nerc.ac.uk/id/eprint/510088/1/Livinstone.pdf Livingstone, Stewart J.; Stokes, Chris R.; Ó Cofaigh, Colm; Hillenbrand, Claus-Dieter orcid:0000-0003-0240-7317 Vieli, Andreas; Jamieson, Stewart S.R.; Spagnolo, Matteo; Dowdeswell, Julian. 2016 Subglacial processes on an Antarctic ice stream bed 1: sediment transport and bedform genesis inferred from marine geophysics. Journal of Glaciology, 62 (232). 270-284. https://doi.org/10.1017/jog.2016.18 <https://doi.org/10.1017/jog.2016.18> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1017/jog.2016.18 |
container_title |
Journal of Glaciology |
container_volume |
62 |
container_issue |
232 |
container_start_page |
270 |
op_container_end_page |
284 |
_version_ |
1766251483635908608 |