Subglacial processes on an Antarctic ice stream bed. 1: Sediment transport and bedform genesis inferred from marine geophysical data
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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International Glaciological Society
2016
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ftunivzuerich:oai:www.zora.uzh.ch:127701 2024-10-13T14:02:41+00:00 Subglacial processes on an Antarctic ice stream bed. 1: Sediment transport and bedform genesis inferred from marine geophysical data Livingstone, Stephen J Stokes, Chris R Ó Cofaigh, Colm Hillenbrand, Claus-Dieter Vieli, Andreas Jamieson, Stewart S R Spagnolo, Matteo Dowdeswell, Julian A 2016 application/pdf https://www.zora.uzh.ch/id/eprint/127701/ https://www.zora.uzh.ch/id/eprint/127701/1/2016_Subglacial_processes_on_an_Antarctic_ice_stream_be.pdf https://doi.org/10.5167/uzh-127701 https://doi.org/10.1017/jog.2016.18 eng eng International Glaciological Society https://www.zora.uzh.ch/id/eprint/127701/1/2016_Subglacial_processes_on_an_Antarctic_ice_stream_be.pdf doi:10.5167/uzh-127701 doi:10.1017/jog.2016.18 urn:issn:0022-1430 info:eu-repo/semantics/openAccess Livingstone, Stephen J; Stokes, Chris R; Ó Cofaigh, Colm; Hillenbrand, Claus-Dieter; Vieli, Andreas; Jamieson, Stewart S R; Spagnolo, Matteo; Dowdeswell, Julian A (2016). Subglacial processes on an Antarctic ice stream bed. 1: Sediment transport and bedform genesis inferred from marine geophysical data. Journal of Glaciology, 62(232):270-284. Institute of Geography 910 Geography & travel Journal Article PeerReviewed info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2016 ftunivzuerich https://doi.org/10.5167/uzh-12770110.1017/jog.2016.18 2024-09-18T00:49:48Z 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 m 3 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 University of Zurich (UZH): ZORA (Zurich Open Repository and 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) |
institution |
Open Polar |
collection |
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive |
op_collection_id |
ftunivzuerich |
language |
English |
topic |
Institute of Geography 910 Geography & travel |
spellingShingle |
Institute of Geography 910 Geography & travel Livingstone, Stephen J Stokes, Chris R Ó Cofaigh, Colm Hillenbrand, Claus-Dieter Vieli, Andreas Jamieson, Stewart S R Spagnolo, Matteo Dowdeswell, Julian A Subglacial processes on an Antarctic ice stream bed. 1: Sediment transport and bedform genesis inferred from marine geophysical data |
topic_facet |
Institute of Geography 910 Geography & travel |
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 m 3 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, Stephen J Stokes, Chris R Ó Cofaigh, Colm Hillenbrand, Claus-Dieter Vieli, Andreas Jamieson, Stewart S R Spagnolo, Matteo Dowdeswell, Julian A |
author_facet |
Livingstone, Stephen J Stokes, Chris R Ó Cofaigh, Colm Hillenbrand, Claus-Dieter Vieli, Andreas Jamieson, Stewart S R Spagnolo, Matteo Dowdeswell, Julian A |
author_sort |
Livingstone, Stephen J |
title |
Subglacial processes on an Antarctic ice stream bed. 1: Sediment transport and bedform genesis inferred from marine geophysical data |
title_short |
Subglacial processes on an Antarctic ice stream bed. 1: Sediment transport and bedform genesis inferred from marine geophysical data |
title_full |
Subglacial processes on an Antarctic ice stream bed. 1: Sediment transport and bedform genesis inferred from marine geophysical data |
title_fullStr |
Subglacial processes on an Antarctic ice stream bed. 1: Sediment transport and bedform genesis inferred from marine geophysical data |
title_full_unstemmed |
Subglacial processes on an Antarctic ice stream bed. 1: Sediment transport and bedform genesis inferred from marine geophysical data |
title_sort |
subglacial processes on an antarctic ice stream bed. 1: sediment transport and bedform genesis inferred from marine geophysical data |
publisher |
International Glaciological Society |
publishDate |
2016 |
url |
https://www.zora.uzh.ch/id/eprint/127701/ https://www.zora.uzh.ch/id/eprint/127701/1/2016_Subglacial_processes_on_an_Antarctic_ice_stream_be.pdf https://doi.org/10.5167/uzh-127701 https://doi.org/10.1017/jog.2016.18 |
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_source |
Livingstone, Stephen J; Stokes, Chris R; Ó Cofaigh, Colm; Hillenbrand, Claus-Dieter; Vieli, Andreas; Jamieson, Stewart S R; Spagnolo, Matteo; Dowdeswell, Julian A (2016). Subglacial processes on an Antarctic ice stream bed. 1: Sediment transport and bedform genesis inferred from marine geophysical data. Journal of Glaciology, 62(232):270-284. |
op_relation |
https://www.zora.uzh.ch/id/eprint/127701/1/2016_Subglacial_processes_on_an_Antarctic_ice_stream_be.pdf doi:10.5167/uzh-127701 doi:10.1017/jog.2016.18 urn:issn:0022-1430 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5167/uzh-12770110.1017/jog.2016.18 |
_version_ |
1812819159846748160 |