Modern to Glacial age subglacial meltwater drainage at Law Dome, coastal East Antarctica from topography, sediments and jökulhlaup observations
Rare jökulhlaup events, also known as subglacial lake outburst flood events, have been observed at the Law Dome ice margin and provide an insight into the physical characteristics of subglacial meltwater and drainage. The subglacial topography based on data from the BEDMAP2 and ICECAP projects, toge...
Published in: | Geological Society, London, Special Publications |
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Language: | English |
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Geological Society of London
2018
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Online Access: | https://researchers.mq.edu.au/en/publications/a96e1cef-e329-4dec-b1e3-f02bb4a05fb4 https://doi.org/10.1144/SP461.16 http://www.scopus.com/inward/record.url?scp=85042660438&partnerID=8YFLogxK |
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ftmacquarieunicr:oai:https://researchers.mq.edu.au:publications/a96e1cef-e329-4dec-b1e3-f02bb4a05fb4 2024-09-15T17:40:51+00:00 Modern to Glacial age subglacial meltwater drainage at Law Dome, coastal East Antarctica from topography, sediments and jökulhlaup observations Goodwin, Ian D. Roberts, Jason L. Etheridge, David M. Hellstrom, John Moy, Andrew D. Ribo, Marta Smith, Andrew M. Siegert, M. J. Jamieson, S. S. R. White, D. A. 2018 https://researchers.mq.edu.au/en/publications/a96e1cef-e329-4dec-b1e3-f02bb4a05fb4 https://doi.org/10.1144/SP461.16 http://www.scopus.com/inward/record.url?scp=85042660438&partnerID=8YFLogxK eng eng Geological Society of London info:eu-repo/semantics/closedAccess Goodwin , I D , Roberts , J L , Etheridge , D M , Hellstrom , J , Moy , A D , Ribo , M & Smith , A M 2018 , Modern to Glacial age subglacial meltwater drainage at Law Dome, coastal East Antarctica from topography, sediments and jökulhlaup observations . in M J Siegert , S S R Jamieson & D A White (eds) , Exploration of subsurface Antarctica : uncovering past changes and modern processes . vol. 461 , Geological Society special publications , Geological Society of London , London , pp. 215-230 . https://doi.org/10.1144/SP461.16 bookPart 2018 ftmacquarieunicr https://doi.org/10.1144/SP461.16 2024-07-31T23:49:40Z Rare jökulhlaup events, also known as subglacial lake outburst flood events, have been observed at the Law Dome ice margin and provide an insight into the physical characteristics of subglacial meltwater and drainage. The subglacial topography based on data from the BEDMAP2 and ICECAP projects, together with subsurface transects of the ice margin obtained using groundpenetrating radar, reveal several lakes and lake-like depressions and the drainage pathways of two jökulhlaup events. Oxygen isotope typing of the meltwater during the most recent (2014) jökulhlaup event, combined with ice margin stratigraphy, enable the identification of ice tunnel melt pathways that exploit the 30–90° dipping basal ice layering. The presence of subglacial meltwater beneath Law Dome during the Holocene to Glacial periods is confirmed by the dendritic drainage pattern in the subglacial morphology and extensive layers of basal regelation ice and subglacial carbonate precipitate deposits found within the Løken Moraines sediments. These subglacial carbonates, including ooid layers, formed from the mixing of glacial meltwater and seawater at 72 ka BP. The combined evidence indicates that the ocean discharge of subglacial meltwater may be variable and/or is periodically blocked by basal freezing events near the ice sheet terminus. Book Part Antarc* Antarctica East Antarctica Ice Sheet Macquarie University Research Portal Geological Society, London, Special Publications 461 1 215 230 |
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Open Polar |
collection |
Macquarie University Research Portal |
op_collection_id |
ftmacquarieunicr |
language |
English |
description |
Rare jökulhlaup events, also known as subglacial lake outburst flood events, have been observed at the Law Dome ice margin and provide an insight into the physical characteristics of subglacial meltwater and drainage. The subglacial topography based on data from the BEDMAP2 and ICECAP projects, together with subsurface transects of the ice margin obtained using groundpenetrating radar, reveal several lakes and lake-like depressions and the drainage pathways of two jökulhlaup events. Oxygen isotope typing of the meltwater during the most recent (2014) jökulhlaup event, combined with ice margin stratigraphy, enable the identification of ice tunnel melt pathways that exploit the 30–90° dipping basal ice layering. The presence of subglacial meltwater beneath Law Dome during the Holocene to Glacial periods is confirmed by the dendritic drainage pattern in the subglacial morphology and extensive layers of basal regelation ice and subglacial carbonate precipitate deposits found within the Løken Moraines sediments. These subglacial carbonates, including ooid layers, formed from the mixing of glacial meltwater and seawater at 72 ka BP. The combined evidence indicates that the ocean discharge of subglacial meltwater may be variable and/or is periodically blocked by basal freezing events near the ice sheet terminus. |
author2 |
Siegert, M. J. Jamieson, S. S. R. White, D. A. |
format |
Book Part |
author |
Goodwin, Ian D. Roberts, Jason L. Etheridge, David M. Hellstrom, John Moy, Andrew D. Ribo, Marta Smith, Andrew M. |
spellingShingle |
Goodwin, Ian D. Roberts, Jason L. Etheridge, David M. Hellstrom, John Moy, Andrew D. Ribo, Marta Smith, Andrew M. Modern to Glacial age subglacial meltwater drainage at Law Dome, coastal East Antarctica from topography, sediments and jökulhlaup observations |
author_facet |
Goodwin, Ian D. Roberts, Jason L. Etheridge, David M. Hellstrom, John Moy, Andrew D. Ribo, Marta Smith, Andrew M. |
author_sort |
Goodwin, Ian D. |
title |
Modern to Glacial age subglacial meltwater drainage at Law Dome, coastal East Antarctica from topography, sediments and jökulhlaup observations |
title_short |
Modern to Glacial age subglacial meltwater drainage at Law Dome, coastal East Antarctica from topography, sediments and jökulhlaup observations |
title_full |
Modern to Glacial age subglacial meltwater drainage at Law Dome, coastal East Antarctica from topography, sediments and jökulhlaup observations |
title_fullStr |
Modern to Glacial age subglacial meltwater drainage at Law Dome, coastal East Antarctica from topography, sediments and jökulhlaup observations |
title_full_unstemmed |
Modern to Glacial age subglacial meltwater drainage at Law Dome, coastal East Antarctica from topography, sediments and jökulhlaup observations |
title_sort |
modern to glacial age subglacial meltwater drainage at law dome, coastal east antarctica from topography, sediments and jökulhlaup observations |
publisher |
Geological Society of London |
publishDate |
2018 |
url |
https://researchers.mq.edu.au/en/publications/a96e1cef-e329-4dec-b1e3-f02bb4a05fb4 https://doi.org/10.1144/SP461.16 http://www.scopus.com/inward/record.url?scp=85042660438&partnerID=8YFLogxK |
genre |
Antarc* Antarctica East Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctica East Antarctica Ice Sheet |
op_source |
Goodwin , I D , Roberts , J L , Etheridge , D M , Hellstrom , J , Moy , A D , Ribo , M & Smith , A M 2018 , Modern to Glacial age subglacial meltwater drainage at Law Dome, coastal East Antarctica from topography, sediments and jökulhlaup observations . in M J Siegert , S S R Jamieson & D A White (eds) , Exploration of subsurface Antarctica : uncovering past changes and modern processes . vol. 461 , Geological Society special publications , Geological Society of London , London , pp. 215-230 . https://doi.org/10.1144/SP461.16 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1144/SP461.16 |
container_title |
Geological Society, London, Special Publications |
container_volume |
461 |
container_issue |
1 |
container_start_page |
215 |
op_container_end_page |
230 |
_version_ |
1810486899411779584 |