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...
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Online Access: | https://doi.org/10.1029/2020GC009156 http://ecite.utas.edu.au/141370 |
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ftunivtasecite:oai:ecite.utas.edu.au:141370 2023-05-15T13:59:46+02:00 Scratching the surface: a marine sediment provenance record from the continental slope of central Wilkes Land, East Antarctica Tooze, S Halpin, JA Noble, TL Chase, Z O'Brien, PE Armand, L 2020 application/pdf https://doi.org/10.1029/2020GC009156 http://ecite.utas.edu.au/141370 en eng Amer Geophysical Union http://ecite.utas.edu.au/141370/2/141370 Scratching the surface.pdf http://dx.doi.org/10.1029/2020GC009156 Tooze, S and Halpin, JA and Noble, TL and Chase, Z and O'Brien, PE and Armand, L, Scratching the surface: a marine sediment provenance record from the continental slope of central Wilkes Land, East Antarctica, Geochemistry Geophysics Geosystems, 21, (11) Article e2020GC009156. ISSN 1525-2027 (2020) [Refereed Article] http://ecite.utas.edu.au/141370 Earth Sciences Geology Geochronology Refereed Article PeerReviewed 2020 ftunivtasecite https://doi.org/10.1029/2020GC009156 2021-05-03T22:17:08Z 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 datasets from rare nearby coastal outcrop. A principally igneous source was revealed with dominant age populations between c. 1360‐1100 Ma and c. 1620‐1490 Ma, characteristic of rocks of the proximal Wilkes and Banzare provinces, respectively. Minor detritus was additionally sourced from the proximal Nuyina Province (c. 1450‐1390 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 eCite UTAS (University of Tasmania) East Antarctica Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) Totten Glacier ENVELOPE(116.333,116.333,-66.833,-66.833) Geochemistry, Geophysics, Geosystems 21 11 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Geology Geochronology |
spellingShingle |
Earth Sciences Geology Geochronology Tooze, S Halpin, JA Noble, TL Chase, Z O'Brien, PE Armand, L Scratching the surface: a marine sediment provenance record from the continental slope of central Wilkes Land, East Antarctica |
topic_facet |
Earth Sciences Geology Geochronology |
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 datasets from rare nearby coastal outcrop. A principally igneous source was revealed with dominant age populations between c. 1360‐1100 Ma and c. 1620‐1490 Ma, characteristic of rocks of the proximal Wilkes and Banzare provinces, respectively. Minor detritus was additionally sourced from the proximal Nuyina Province (c. 1450‐1390 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, S Halpin, JA Noble, TL Chase, Z O'Brien, PE Armand, L |
author_facet |
Tooze, S Halpin, JA Noble, TL Chase, Z O'Brien, PE Armand, L |
author_sort |
Tooze, S |
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 |
publisher |
Amer Geophysical Union |
publishDate |
2020 |
url |
https://doi.org/10.1029/2020GC009156 http://ecite.utas.edu.au/141370 |
long_lat |
ENVELOPE(120.000,120.000,-69.000,-69.000) ENVELOPE(116.333,116.333,-66.833,-66.833) |
geographic |
East Antarctica Wilkes Land Totten Glacier |
geographic_facet |
East Antarctica Wilkes Land Totten Glacier |
genre |
Antarc* Antarctica East Antarctica Ice Sheet Totten Glacier Wilkes Land |
genre_facet |
Antarc* Antarctica East Antarctica Ice Sheet Totten Glacier Wilkes Land |
op_relation |
http://ecite.utas.edu.au/141370/2/141370 Scratching the surface.pdf http://dx.doi.org/10.1029/2020GC009156 Tooze, S and Halpin, JA and Noble, TL and Chase, Z and O'Brien, PE and Armand, L, Scratching the surface: a marine sediment provenance record from the continental slope of central Wilkes Land, East Antarctica, Geochemistry Geophysics Geosystems, 21, (11) Article e2020GC009156. ISSN 1525-2027 (2020) [Refereed Article] http://ecite.utas.edu.au/141370 |
op_doi |
https://doi.org/10.1029/2020GC009156 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
21 |
container_issue |
11 |
_version_ |
1766268554521346048 |