The Permo-Triassic Gondwana sequence, central Transantarctic Mountains, Antarctica: Zircon geochronology, provenance, and basin evolution
The most complete Permian-Triassic Gondwana succession in Antarctica crops out in the central Trans-ant-arc-tic Mountains. The lower Permian strata were deposited in an intracratonic basin that evolved into a foreland basin in late Permian time. Sedimentary petrology and paleocurrent data have been...
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ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/207420 2024-01-14T10:01:44+01:00 The Permo-Triassic Gondwana sequence, central Transantarctic Mountains, Antarctica: Zircon geochronology, provenance, and basin evolution Elliot, D.H Fanning, Christopher Mark Isbell, John L Hulett, Samuel R W application/pdf http://hdl.handle.net/1885/207420 https://doi.org/10.1130/GES01345.1 https://openresearch-repository.anu.edu.au/bitstream/1885/207420/5/01_Elliot_The_Permo-Triassic_Gondwana_2017.pdf.jpg en_AU eng Geological Society of America Inc 1553-040X http://hdl.handle.net/1885/207420 doi:10.1130/GES01345.1 https://openresearch-repository.anu.edu.au/bitstream/1885/207420/5/01_Elliot_The_Permo-Triassic_Gondwana_2017.pdf.jpg © 2016 Geological Society of America Geosphere Journal article ftanucanberra https://doi.org/10.1130/GES01345.1 2023-12-15T09:35:14Z The most complete Permian-Triassic Gondwana succession in Antarctica crops out in the central Trans-ant-arc-tic Mountains. The lower Permian strata were deposited in an intracratonic basin that evolved into a foreland basin in late Permian time. Sedimentary petrology and paleocurrent data have been interpreted as indicating a granitic (craton) provenance and a West Antarctic volcanic provenance. To address the West Antarctic provenance and evolution of the detrital input, detrital-zircon grains from nine sandstones (plus three sandstones reported previously) representing the full extent of the Permo-Triassic succession exposed on that flank of the basin, have been analyzed by sensitive high-resolution ion microprobe. Results define three provenances: an early (early to middle Permian) provenance that is dominated by zircons having Ross orogen ages (600-480 Ma); a middle (late Permian) provenance dominated by Permian zircons with subordinate older magmatic arc grains plus lesser Ross orogen-age grains; and a late (Triassic) provenance, which is quite variable and in which the predominant Triassic arc component ranges from very minor to significant and again with a component of Ross orogenage grains. Detrital zircons imply a more extensive Permo-Triassic arc, in time and space, on the Gondwana margin than is evident from outcrop data. The zircon data are integrated into a model for basin evolution and infilling, providing broad constraints on the timing of tectonic events and the provenance. Article in Journal/Newspaper Antarc* Antarctic Antarctica Australian National University: ANU Digital Collections Antarctic Transantarctic Mountains Geosphere 13 1 155 178 |
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Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
English |
description |
The most complete Permian-Triassic Gondwana succession in Antarctica crops out in the central Trans-ant-arc-tic Mountains. The lower Permian strata were deposited in an intracratonic basin that evolved into a foreland basin in late Permian time. Sedimentary petrology and paleocurrent data have been interpreted as indicating a granitic (craton) provenance and a West Antarctic volcanic provenance. To address the West Antarctic provenance and evolution of the detrital input, detrital-zircon grains from nine sandstones (plus three sandstones reported previously) representing the full extent of the Permo-Triassic succession exposed on that flank of the basin, have been analyzed by sensitive high-resolution ion microprobe. Results define three provenances: an early (early to middle Permian) provenance that is dominated by zircons having Ross orogen ages (600-480 Ma); a middle (late Permian) provenance dominated by Permian zircons with subordinate older magmatic arc grains plus lesser Ross orogen-age grains; and a late (Triassic) provenance, which is quite variable and in which the predominant Triassic arc component ranges from very minor to significant and again with a component of Ross orogenage grains. Detrital zircons imply a more extensive Permo-Triassic arc, in time and space, on the Gondwana margin than is evident from outcrop data. The zircon data are integrated into a model for basin evolution and infilling, providing broad constraints on the timing of tectonic events and the provenance. |
format |
Article in Journal/Newspaper |
author |
Elliot, D.H Fanning, Christopher Mark Isbell, John L Hulett, Samuel R W |
spellingShingle |
Elliot, D.H Fanning, Christopher Mark Isbell, John L Hulett, Samuel R W The Permo-Triassic Gondwana sequence, central Transantarctic Mountains, Antarctica: Zircon geochronology, provenance, and basin evolution |
author_facet |
Elliot, D.H Fanning, Christopher Mark Isbell, John L Hulett, Samuel R W |
author_sort |
Elliot, D.H |
title |
The Permo-Triassic Gondwana sequence, central Transantarctic Mountains, Antarctica: Zircon geochronology, provenance, and basin evolution |
title_short |
The Permo-Triassic Gondwana sequence, central Transantarctic Mountains, Antarctica: Zircon geochronology, provenance, and basin evolution |
title_full |
The Permo-Triassic Gondwana sequence, central Transantarctic Mountains, Antarctica: Zircon geochronology, provenance, and basin evolution |
title_fullStr |
The Permo-Triassic Gondwana sequence, central Transantarctic Mountains, Antarctica: Zircon geochronology, provenance, and basin evolution |
title_full_unstemmed |
The Permo-Triassic Gondwana sequence, central Transantarctic Mountains, Antarctica: Zircon geochronology, provenance, and basin evolution |
title_sort |
permo-triassic gondwana sequence, central transantarctic mountains, antarctica: zircon geochronology, provenance, and basin evolution |
publisher |
Geological Society of America Inc |
url |
http://hdl.handle.net/1885/207420 https://doi.org/10.1130/GES01345.1 https://openresearch-repository.anu.edu.au/bitstream/1885/207420/5/01_Elliot_The_Permo-Triassic_Gondwana_2017.pdf.jpg |
geographic |
Antarctic Transantarctic Mountains |
geographic_facet |
Antarctic Transantarctic Mountains |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
Geosphere |
op_relation |
1553-040X http://hdl.handle.net/1885/207420 doi:10.1130/GES01345.1 https://openresearch-repository.anu.edu.au/bitstream/1885/207420/5/01_Elliot_The_Permo-Triassic_Gondwana_2017.pdf.jpg |
op_rights |
© 2016 Geological Society of America |
op_doi |
https://doi.org/10.1130/GES01345.1 |
container_title |
Geosphere |
container_volume |
13 |
container_issue |
1 |
container_start_page |
155 |
op_container_end_page |
178 |
_version_ |
1788067499210702848 |