Age and composition of Antarctic sub-glacial bedrock reflected by detrital zircons, erratics, and recycled microfossils in the Ellsworth Land-Antarctic Peninsula-Weddell Sea-Dronning Maud Land sector (240 degrees E-0 degrees-015 degrees E)
The age and composition of the 14 x 10(6) km(2) of Antarctica's surface obscured by ice is unknown except for some dated detrital minerals and erratics. In remedy, we present four new analyses (U-Pb age, T-DM(C), epsilon Hf, and rock type) of detrital zircons from Neogene turbidites as proxies...
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Online Access: | https://researchers.mq.edu.au/en/publications/34e2554f-2b9f-4935-a181-e70f2272eb30 https://doi.org/10.1016/j.gr.2012.05.010 |
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ftmacquarieunicr:oai:https://researchers.mq.edu.au:publications/34e2554f-2b9f-4935-a181-e70f2272eb30 2024-09-30T14:26:27+00:00 Age and composition of Antarctic sub-glacial bedrock reflected by detrital zircons, erratics, and recycled microfossils in the Ellsworth Land-Antarctic Peninsula-Weddell Sea-Dronning Maud Land sector (240 degrees E-0 degrees-015 degrees E) Veevers, J. J. Saeed, Ayesha 2013-01 https://researchers.mq.edu.au/en/publications/34e2554f-2b9f-4935-a181-e70f2272eb30 https://doi.org/10.1016/j.gr.2012.05.010 eng eng info:eu-repo/semantics/closedAccess Veevers , J J & Saeed , A 2013 , ' Age and composition of Antarctic sub-glacial bedrock reflected by detrital zircons, erratics, and recycled microfossils in the Ellsworth Land-Antarctic Peninsula-Weddell Sea-Dronning Maud Land sector (240 degrees E-0 degrees-015 degrees E) ' , Gondwana Research , vol. 23 , no. 1 , pp. 296-332 . https://doi.org/10.1016/j.gr.2012.05.010 Detrital zircons U-Pb ages Hf-isotopes Erratics Recycled microfossils Ice-covered Antarctica MARIE-BYRD-LAND U-PB GEOCHRONOLOGY LARGE IGNEOUS PROVINCE ARCHAEOCYATHAN LIMESTONE BLOCKS PRINCE-CHARLES MOUNTAINS SOUTH SHETLAND ISLANDS HOST-ROCK AFFINITY KING GEORGE ISLAND T-DM AGES EAST ANTARCTICA article 2013 ftmacquarieunicr https://doi.org/10.1016/j.gr.2012.05.010 2024-09-04T23:52:01Z The age and composition of the 14 x 10(6) km(2) of Antarctica's surface obscured by ice is unknown except for some dated detrital minerals and erratics. In remedy, we present four new analyses (U-Pb age, T-DM(C), epsilon Hf, and rock type) of detrital zircons from Neogene turbidites as proxies of Antarctic bedrock, and review published proxies: detrital hornblendes analysed for Ar-Ar age and bulk Sm-Nd isotopes: Pb isotope compositions of detrital K-feldspars: erratics and dropstones that reflect age and composition: and recycled microfossils that reflect age and facies. This work deals with the 240 degrees E-0 degrees-015 degrees E sector, and complements Veevers and Saeed's (2011) analysis of the 70 degrees E-240 degrees E sector. Each sample is located in its ice-drainage basin for backtracking to the potential provenance. Gaps in age between sample and upslope exposure are specifically attributable to the provenance. The major provenance of detritus west of the Antarctic Peninsula (AP) is West Antarctica, and of detritus east of the AP East Antarctica. We confirm that the Central Antarctic provenance about a core of the Gamburtsev Subglacial Mountains (GSM) and the Vostok Subglacial Highlands (VSH) contains a basement that includes igneous (mafic granitoids) and metamorphic rocks with peak U-Pb ages of 0.65-0.50, 1.20-0.9, 2.1-1.9, 2.8-2.6, and 3.35-3.30 Ga, T-DM(C) of 3.6-1.3 Ga, and mainly negative epsilon Hf. The potential provenance of zircons of 650-500 Ma age with T-DM(C) ages of 1.55 Ga, and of zircons of 1200-900 Ma age with positive epsilon Hf lies beneath the ice in East Antarctica south and southeast of Dronning Maud Land within the Antarctic part of the East African-Antarctic Orogen. Zircons with the additional ages of 1.7-1.4 Ga, 2.1-1.9 Ga, and 3.35-3.00 Ga have a potential provenance in the GSM. (c) 2012 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Dronning Maud Land East Antarctica King George Island Marie Byrd Land Prince Charles Mountains South Shetland Islands Weddell Sea West Antarctica Macquarie University Research Portal Antarctic The Antarctic Antarctic Peninsula Weddell Sea East Antarctica Dronning Maud Land King George Island West Antarctica South Shetland Islands Weddell Byrd Marie Byrd Land ENVELOPE(-130.000,-130.000,-78.000,-78.000) Prince Charles Mountains ENVELOPE(67.246,67.246,-71.427,-71.427) Ellsworth Land ENVELOPE(-85.000,-85.000,-75.000,-75.000) Gamburtsev Subglacial Mountains ENVELOPE(76.000,76.000,-80.500,-80.500) Vostok Subglacial Highlands ENVELOPE(102.000,102.000,-80.000,-80.000) Gondwana Research 23 1 296 332 |
institution |
Open Polar |
collection |
Macquarie University Research Portal |
op_collection_id |
ftmacquarieunicr |
language |
English |
topic |
Detrital zircons U-Pb ages Hf-isotopes Erratics Recycled microfossils Ice-covered Antarctica MARIE-BYRD-LAND U-PB GEOCHRONOLOGY LARGE IGNEOUS PROVINCE ARCHAEOCYATHAN LIMESTONE BLOCKS PRINCE-CHARLES MOUNTAINS SOUTH SHETLAND ISLANDS HOST-ROCK AFFINITY KING GEORGE ISLAND T-DM AGES EAST ANTARCTICA |
spellingShingle |
Detrital zircons U-Pb ages Hf-isotopes Erratics Recycled microfossils Ice-covered Antarctica MARIE-BYRD-LAND U-PB GEOCHRONOLOGY LARGE IGNEOUS PROVINCE ARCHAEOCYATHAN LIMESTONE BLOCKS PRINCE-CHARLES MOUNTAINS SOUTH SHETLAND ISLANDS HOST-ROCK AFFINITY KING GEORGE ISLAND T-DM AGES EAST ANTARCTICA Veevers, J. J. Saeed, Ayesha Age and composition of Antarctic sub-glacial bedrock reflected by detrital zircons, erratics, and recycled microfossils in the Ellsworth Land-Antarctic Peninsula-Weddell Sea-Dronning Maud Land sector (240 degrees E-0 degrees-015 degrees E) |
topic_facet |
Detrital zircons U-Pb ages Hf-isotopes Erratics Recycled microfossils Ice-covered Antarctica MARIE-BYRD-LAND U-PB GEOCHRONOLOGY LARGE IGNEOUS PROVINCE ARCHAEOCYATHAN LIMESTONE BLOCKS PRINCE-CHARLES MOUNTAINS SOUTH SHETLAND ISLANDS HOST-ROCK AFFINITY KING GEORGE ISLAND T-DM AGES EAST ANTARCTICA |
description |
The age and composition of the 14 x 10(6) km(2) of Antarctica's surface obscured by ice is unknown except for some dated detrital minerals and erratics. In remedy, we present four new analyses (U-Pb age, T-DM(C), epsilon Hf, and rock type) of detrital zircons from Neogene turbidites as proxies of Antarctic bedrock, and review published proxies: detrital hornblendes analysed for Ar-Ar age and bulk Sm-Nd isotopes: Pb isotope compositions of detrital K-feldspars: erratics and dropstones that reflect age and composition: and recycled microfossils that reflect age and facies. This work deals with the 240 degrees E-0 degrees-015 degrees E sector, and complements Veevers and Saeed's (2011) analysis of the 70 degrees E-240 degrees E sector. Each sample is located in its ice-drainage basin for backtracking to the potential provenance. Gaps in age between sample and upslope exposure are specifically attributable to the provenance. The major provenance of detritus west of the Antarctic Peninsula (AP) is West Antarctica, and of detritus east of the AP East Antarctica. We confirm that the Central Antarctic provenance about a core of the Gamburtsev Subglacial Mountains (GSM) and the Vostok Subglacial Highlands (VSH) contains a basement that includes igneous (mafic granitoids) and metamorphic rocks with peak U-Pb ages of 0.65-0.50, 1.20-0.9, 2.1-1.9, 2.8-2.6, and 3.35-3.30 Ga, T-DM(C) of 3.6-1.3 Ga, and mainly negative epsilon Hf. The potential provenance of zircons of 650-500 Ma age with T-DM(C) ages of 1.55 Ga, and of zircons of 1200-900 Ma age with positive epsilon Hf lies beneath the ice in East Antarctica south and southeast of Dronning Maud Land within the Antarctic part of the East African-Antarctic Orogen. Zircons with the additional ages of 1.7-1.4 Ga, 2.1-1.9 Ga, and 3.35-3.00 Ga have a potential provenance in the GSM. (c) 2012 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Veevers, J. J. Saeed, Ayesha |
author_facet |
Veevers, J. J. Saeed, Ayesha |
author_sort |
Veevers, J. J. |
title |
Age and composition of Antarctic sub-glacial bedrock reflected by detrital zircons, erratics, and recycled microfossils in the Ellsworth Land-Antarctic Peninsula-Weddell Sea-Dronning Maud Land sector (240 degrees E-0 degrees-015 degrees E) |
title_short |
Age and composition of Antarctic sub-glacial bedrock reflected by detrital zircons, erratics, and recycled microfossils in the Ellsworth Land-Antarctic Peninsula-Weddell Sea-Dronning Maud Land sector (240 degrees E-0 degrees-015 degrees E) |
title_full |
Age and composition of Antarctic sub-glacial bedrock reflected by detrital zircons, erratics, and recycled microfossils in the Ellsworth Land-Antarctic Peninsula-Weddell Sea-Dronning Maud Land sector (240 degrees E-0 degrees-015 degrees E) |
title_fullStr |
Age and composition of Antarctic sub-glacial bedrock reflected by detrital zircons, erratics, and recycled microfossils in the Ellsworth Land-Antarctic Peninsula-Weddell Sea-Dronning Maud Land sector (240 degrees E-0 degrees-015 degrees E) |
title_full_unstemmed |
Age and composition of Antarctic sub-glacial bedrock reflected by detrital zircons, erratics, and recycled microfossils in the Ellsworth Land-Antarctic Peninsula-Weddell Sea-Dronning Maud Land sector (240 degrees E-0 degrees-015 degrees E) |
title_sort |
age and composition of antarctic sub-glacial bedrock reflected by detrital zircons, erratics, and recycled microfossils in the ellsworth land-antarctic peninsula-weddell sea-dronning maud land sector (240 degrees e-0 degrees-015 degrees e) |
publishDate |
2013 |
url |
https://researchers.mq.edu.au/en/publications/34e2554f-2b9f-4935-a181-e70f2272eb30 https://doi.org/10.1016/j.gr.2012.05.010 |
long_lat |
ENVELOPE(-130.000,-130.000,-78.000,-78.000) ENVELOPE(67.246,67.246,-71.427,-71.427) ENVELOPE(-85.000,-85.000,-75.000,-75.000) ENVELOPE(76.000,76.000,-80.500,-80.500) ENVELOPE(102.000,102.000,-80.000,-80.000) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Weddell Sea East Antarctica Dronning Maud Land King George Island West Antarctica South Shetland Islands Weddell Byrd Marie Byrd Land Prince Charles Mountains Ellsworth Land Gamburtsev Subglacial Mountains Vostok Subglacial Highlands |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Weddell Sea East Antarctica Dronning Maud Land King George Island West Antarctica South Shetland Islands Weddell Byrd Marie Byrd Land Prince Charles Mountains Ellsworth Land Gamburtsev Subglacial Mountains Vostok Subglacial Highlands |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Dronning Maud Land East Antarctica King George Island Marie Byrd Land Prince Charles Mountains South Shetland Islands Weddell Sea West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Dronning Maud Land East Antarctica King George Island Marie Byrd Land Prince Charles Mountains South Shetland Islands Weddell Sea West Antarctica |
op_source |
Veevers , J J & Saeed , A 2013 , ' Age and composition of Antarctic sub-glacial bedrock reflected by detrital zircons, erratics, and recycled microfossils in the Ellsworth Land-Antarctic Peninsula-Weddell Sea-Dronning Maud Land sector (240 degrees E-0 degrees-015 degrees E) ' , Gondwana Research , vol. 23 , no. 1 , pp. 296-332 . https://doi.org/10.1016/j.gr.2012.05.010 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.gr.2012.05.010 |
container_title |
Gondwana Research |
container_volume |
23 |
container_issue |
1 |
container_start_page |
296 |
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332 |
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