Scratching the surface:a marine sediment provenance record from the continental slope of central Wilkes Land, East Antarctica
The geology of Wilkes Land, East Antarctica, is masked by kilometers of ice and remains largely unexplored. Defining the sediment provenance adjacent to this hidden region is important for distinguishing the proximal subglacial basement terranes and refining the dynamic regional glaciological histor...
Published in: | Geochemistry, Geophysics, Geosystems |
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Language: | English |
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2020
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Online Access: | https://researchers.mq.edu.au/en/publications/c2a0060d-6fbb-4403-ba8b-c9451876af68 https://doi.org/10.1029/2020GC009156 https://research-management.mq.edu.au/ws/files/164630586/164388922.pdf http://www.scopus.com/inward/record.url?scp=85096419931&partnerID=8YFLogxK http://purl.org/au-research/grants/arc/SR140300001 |
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ftmacquarieunicr:oai:https://researchers.mq.edu.au:publications/c2a0060d-6fbb-4403-ba8b-c9451876af68 2024-06-23T07:46:11+00:00 Scratching the surface:a marine sediment provenance record from the continental slope of central Wilkes Land, East Antarctica Tooze, Sian Halpin, Jacqueline A. Noble, Taryn L. Chase, Zanna O'Brien, Philip E. Armand, Leanne 2020-11 application/pdf https://researchers.mq.edu.au/en/publications/c2a0060d-6fbb-4403-ba8b-c9451876af68 https://doi.org/10.1029/2020GC009156 https://research-management.mq.edu.au/ws/files/164630586/164388922.pdf http://www.scopus.com/inward/record.url?scp=85096419931&partnerID=8YFLogxK http://purl.org/au-research/grants/arc/SR140300001 eng eng info:eu-repo/semantics/openAccess Tooze , S , Halpin , J A , Noble , T L , Chase , Z , O'Brien , P E & Armand , L 2020 , ' Scratching the surface : a marine sediment provenance record from the continental slope of central Wilkes Land, East Antarctica ' , Geochemistry, Geophysics, Geosystems , vol. 21 , no. 11 , e2020GC009156 , pp. 1-23 . https://doi.org/10.1029/2020GC009156 article 2020 ftmacquarieunicr https://doi.org/10.1029/2020GC009156 2024-06-12T23:47:23Z The geology of Wilkes Land, East Antarctica, is masked by kilometers of ice and remains largely unexplored. Defining the sediment provenance adjacent to this hidden region is important for distinguishing the proximal subglacial basement terranes and refining the dynamic regional glaciological history. This study presents a detrital sediment provenance record spanning c. 23.5 ka from the continental slope of central Wilkes Land. Sediment provenance was characterized using U-Pb geochronology and trace element geochemistry from detrital zircon, titanite and apatite, and Pb isotopic signatures from detrital feldspar. These data were compared with new feldspar Pb-isotopic signatures and existing U-Pb zircon data sets from rare nearby coastal outcrop. A principally igneous source was revealed with dominant age populations between c. 1,360-1,100 Ma and c. 1,620-1,490 Ma, characteristic of rocks of the proximal Wilkes and Banzare provinces, respectively. Minor detritus was additionally sourced from the proximal Nuyina Province (c. 1,450-1,390 Ma). Temporal variation in the climate and ice sheet configuration are likely responsible for subtle downcore changes observed in detrital sediment provenance. High sedimentation rates during the glacial period suggest reworking of continental shelf sediments and downslope transport in debris flows during ice sheet advance. Glacial meltwater fluxes fed largely by the Totten Glacier were responsible for supplying detritus during deglaciation. During interglacials, detritus was derived from a broad coastal region and delivered to the slope via multiple glacial outlets. These results present the first substantial offshore evidence to support recent interpretations that the subglacial crust of central Wilkes Land has a dominantly Mesoproterozoic history. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Ice Sheet Totten Glacier Wilkes Land Macquarie University Research Portal East Antarctica Totten Glacier ENVELOPE(116.333,116.333,-66.833,-66.833) Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) Geochemistry, Geophysics, Geosystems 21 11 |
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Open Polar |
collection |
Macquarie University Research Portal |
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ftmacquarieunicr |
language |
English |
description |
The geology of Wilkes Land, East Antarctica, is masked by kilometers of ice and remains largely unexplored. Defining the sediment provenance adjacent to this hidden region is important for distinguishing the proximal subglacial basement terranes and refining the dynamic regional glaciological history. This study presents a detrital sediment provenance record spanning c. 23.5 ka from the continental slope of central Wilkes Land. Sediment provenance was characterized using U-Pb geochronology and trace element geochemistry from detrital zircon, titanite and apatite, and Pb isotopic signatures from detrital feldspar. These data were compared with new feldspar Pb-isotopic signatures and existing U-Pb zircon data sets from rare nearby coastal outcrop. A principally igneous source was revealed with dominant age populations between c. 1,360-1,100 Ma and c. 1,620-1,490 Ma, characteristic of rocks of the proximal Wilkes and Banzare provinces, respectively. Minor detritus was additionally sourced from the proximal Nuyina Province (c. 1,450-1,390 Ma). Temporal variation in the climate and ice sheet configuration are likely responsible for subtle downcore changes observed in detrital sediment provenance. High sedimentation rates during the glacial period suggest reworking of continental shelf sediments and downslope transport in debris flows during ice sheet advance. Glacial meltwater fluxes fed largely by the Totten Glacier were responsible for supplying detritus during deglaciation. During interglacials, detritus was derived from a broad coastal region and delivered to the slope via multiple glacial outlets. These results present the first substantial offshore evidence to support recent interpretations that the subglacial crust of central Wilkes Land has a dominantly Mesoproterozoic history. |
format |
Article in Journal/Newspaper |
author |
Tooze, Sian Halpin, Jacqueline A. Noble, Taryn L. Chase, Zanna O'Brien, Philip E. Armand, Leanne |
spellingShingle |
Tooze, Sian Halpin, Jacqueline A. Noble, Taryn L. Chase, Zanna O'Brien, Philip E. Armand, Leanne Scratching the surface:a marine sediment provenance record from the continental slope of central Wilkes Land, East Antarctica |
author_facet |
Tooze, Sian Halpin, Jacqueline A. Noble, Taryn L. Chase, Zanna O'Brien, Philip E. Armand, Leanne |
author_sort |
Tooze, Sian |
title |
Scratching the surface:a marine sediment provenance record from the continental slope of central Wilkes Land, East Antarctica |
title_short |
Scratching the surface:a marine sediment provenance record from the continental slope of central Wilkes Land, East Antarctica |
title_full |
Scratching the surface:a marine sediment provenance record from the continental slope of central Wilkes Land, East Antarctica |
title_fullStr |
Scratching the surface:a marine sediment provenance record from the continental slope of central Wilkes Land, East Antarctica |
title_full_unstemmed |
Scratching the surface:a marine sediment provenance record from the continental slope of central Wilkes Land, East Antarctica |
title_sort |
scratching the surface:a marine sediment provenance record from the continental slope of central wilkes land, east antarctica |
publishDate |
2020 |
url |
https://researchers.mq.edu.au/en/publications/c2a0060d-6fbb-4403-ba8b-c9451876af68 https://doi.org/10.1029/2020GC009156 https://research-management.mq.edu.au/ws/files/164630586/164388922.pdf http://www.scopus.com/inward/record.url?scp=85096419931&partnerID=8YFLogxK http://purl.org/au-research/grants/arc/SR140300001 |
long_lat |
ENVELOPE(116.333,116.333,-66.833,-66.833) ENVELOPE(120.000,120.000,-69.000,-69.000) |
geographic |
East Antarctica Totten Glacier Wilkes Land |
geographic_facet |
East Antarctica Totten Glacier Wilkes Land |
genre |
Antarc* Antarctica East Antarctica Ice Sheet Totten Glacier Wilkes Land |
genre_facet |
Antarc* Antarctica East Antarctica Ice Sheet Totten Glacier Wilkes Land |
op_source |
Tooze , S , Halpin , J A , Noble , T L , Chase , Z , O'Brien , P E & Armand , L 2020 , ' Scratching the surface : a marine sediment provenance record from the continental slope of central Wilkes Land, East Antarctica ' , Geochemistry, Geophysics, Geosystems , vol. 21 , no. 11 , e2020GC009156 , pp. 1-23 . https://doi.org/10.1029/2020GC009156 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2020GC009156 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
21 |
container_issue |
11 |
_version_ |
1802644384193183744 |