Scratching the Surface: A Marine Sediment Provenance Record From the Continental Slope of Central Wilkes Land, East Antarctica
Abstract 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 glaciologic...
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ftdoajarticles:oai:doaj.org/article:19454053bb144ff883b8211ee163effc 2023-12-03T10:13:33+01:00 Scratching the Surface: A Marine Sediment Provenance Record From the Continental Slope of Central Wilkes Land, East Antarctica Sian Tooze Jacqueline A. Halpin Taryn L. Noble Zanna Chase Philip E. O'Brien Leanne Armand 2020-11-01T00:00:00Z https://doi.org/10.1029/2020GC009156 https://doaj.org/article/19454053bb144ff883b8211ee163effc EN eng Wiley https://doi.org/10.1029/2020GC009156 https://doaj.org/toc/1525-2027 1525-2027 doi:10.1029/2020GC009156 https://doaj.org/article/19454053bb144ff883b8211ee163effc Geochemistry, Geophysics, Geosystems, Vol 21, Iss 11, Pp n/a-n/a (2020) Antarctic geology East Antarctica geochemistry geochronology sediment provenance Wilkes Land Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 article 2020 ftdoajarticles https://doi.org/10.1029/2020GC009156 2023-11-05T01:35:52Z Abstract 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* Antarctic Antarctica East Antarctica Ice Sheet Totten Glacier Wilkes Land Directory of Open Access Journals: DOAJ Articles Antarctic 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 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Antarctic geology East Antarctica geochemistry geochronology sediment provenance Wilkes Land Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 |
spellingShingle |
Antarctic geology East Antarctica geochemistry geochronology sediment provenance Wilkes Land Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 Sian Tooze Jacqueline A. Halpin Taryn L. Noble Zanna Chase Philip E. O'Brien Leanne Armand Scratching the Surface: A Marine Sediment Provenance Record From the Continental Slope of Central Wilkes Land, East Antarctica |
topic_facet |
Antarctic geology East Antarctica geochemistry geochronology sediment provenance Wilkes Land Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 |
description |
Abstract 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 |
Sian Tooze Jacqueline A. Halpin Taryn L. Noble Zanna Chase Philip E. O'Brien Leanne Armand |
author_facet |
Sian Tooze Jacqueline A. Halpin Taryn L. Noble Zanna Chase Philip E. O'Brien Leanne Armand |
author_sort |
Sian Tooze |
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 |
Wiley |
publishDate |
2020 |
url |
https://doi.org/10.1029/2020GC009156 https://doaj.org/article/19454053bb144ff883b8211ee163effc |
long_lat |
ENVELOPE(116.333,116.333,-66.833,-66.833) ENVELOPE(120.000,120.000,-69.000,-69.000) |
geographic |
Antarctic East Antarctica Totten Glacier Wilkes Land |
geographic_facet |
Antarctic East Antarctica Totten Glacier Wilkes Land |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Totten Glacier Wilkes Land |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Totten Glacier Wilkes Land |
op_source |
Geochemistry, Geophysics, Geosystems, Vol 21, Iss 11, Pp n/a-n/a (2020) |
op_relation |
https://doi.org/10.1029/2020GC009156 https://doaj.org/toc/1525-2027 1525-2027 doi:10.1029/2020GC009156 https://doaj.org/article/19454053bb144ff883b8211ee163effc |
op_doi |
https://doi.org/10.1029/2020GC009156 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
21 |
container_issue |
11 |
_version_ |
1784260364447252480 |