Naturaliste Plateau, offshore western Australia:A submarine window into Gondwana assembly and breakup
The origin of the submarine Naturaliste Plateau off the southwestern coast of Australia is controversial; previous work supports both oceanic and continental affinities for the basement to volcanic and sedimentary sequences. We report the first evidence of reworked Mesoproterozoic (ca. 1230-1190 Ma)...
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ftmacquarieunicr:oai:https://researchers.mq.edu.au:publications/9f61bf70-67f7-498f-80e8-bcef255b9db5 2024-06-23T07:47:09+00:00 Naturaliste Plateau, offshore western Australia:A submarine window into Gondwana assembly and breakup Halpin, Jacqueline A. Crawford, Anthony J. Direen, Nicholas G. Coffin, Millard F. Forbes, Caroline J. Borissova, Irina 2008 https://researchers.mq.edu.au/en/publications/9f61bf70-67f7-498f-80e8-bcef255b9db5 https://doi.org/10.1130/G25059A.1 http://www.scopus.com/inward/record.url?scp=54949121405&partnerID=8YFLogxK eng eng info:eu-repo/semantics/closedAccess Halpin , J A , Crawford , A J , Direen , N G , Coffin , M F , Forbes , C J & Borissova , I 2008 , ' Naturaliste Plateau, offshore western Australia : A submarine window into Gondwana assembly and breakup ' , Geology , vol. 36 , no. 10 , pp. 807-810 . https://doi.org/10.1130/G25059A.1 Extensional allochthon Naturaliste Plateau Pinjarra Orogen U-Pb zircon ages U-Th-Pb monazite ages article 2008 ftmacquarieunicr https://doi.org/10.1130/G25059A.1 2024-06-12T23:47:21Z The origin of the submarine Naturaliste Plateau off the southwestern coast of Australia is controversial; previous work supports both oceanic and continental affinities for the basement to volcanic and sedimentary sequences. We report the first evidence of reworked Mesoproterozoic (ca. 1230-1190 Ma) continental crust, based on laser ablation-inductively coupled plasma-mass spectrometry analysis of zircons from granite and orthogneiss samples dredged from the southern margin of the plateau. Thermobarometry of peak metamorphic minerals and electron microprobe chemical dating of monazite reveal that these igneous rocks were metamorphosed to ∼700 °C and ∼6.5 kbar during the Cambrian Pinjarra Orogeny at ca. 515 Ma. These data confirm a continental origin for a significant swathe of the southern Naturaliste Plateau, and suggest that the protoliths may have affinities to Mesoproterozoic crust within the Albany-Fraser-Wilkes Orogen (Australia-Antarctica). The present Naturaliste Plateau basement beneath its volcanic carapace probably represents a middle- to lower-crustal extensional allochthon exhumed during Cretaceous hyperextensional breakup between Australia and Antarctica. Article in Journal/Newspaper Antarc* Antarctica Macquarie University Research Portal Geology 36 10 807 |
institution |
Open Polar |
collection |
Macquarie University Research Portal |
op_collection_id |
ftmacquarieunicr |
language |
English |
topic |
Extensional allochthon Naturaliste Plateau Pinjarra Orogen U-Pb zircon ages U-Th-Pb monazite ages |
spellingShingle |
Extensional allochthon Naturaliste Plateau Pinjarra Orogen U-Pb zircon ages U-Th-Pb monazite ages Halpin, Jacqueline A. Crawford, Anthony J. Direen, Nicholas G. Coffin, Millard F. Forbes, Caroline J. Borissova, Irina Naturaliste Plateau, offshore western Australia:A submarine window into Gondwana assembly and breakup |
topic_facet |
Extensional allochthon Naturaliste Plateau Pinjarra Orogen U-Pb zircon ages U-Th-Pb monazite ages |
description |
The origin of the submarine Naturaliste Plateau off the southwestern coast of Australia is controversial; previous work supports both oceanic and continental affinities for the basement to volcanic and sedimentary sequences. We report the first evidence of reworked Mesoproterozoic (ca. 1230-1190 Ma) continental crust, based on laser ablation-inductively coupled plasma-mass spectrometry analysis of zircons from granite and orthogneiss samples dredged from the southern margin of the plateau. Thermobarometry of peak metamorphic minerals and electron microprobe chemical dating of monazite reveal that these igneous rocks were metamorphosed to ∼700 °C and ∼6.5 kbar during the Cambrian Pinjarra Orogeny at ca. 515 Ma. These data confirm a continental origin for a significant swathe of the southern Naturaliste Plateau, and suggest that the protoliths may have affinities to Mesoproterozoic crust within the Albany-Fraser-Wilkes Orogen (Australia-Antarctica). The present Naturaliste Plateau basement beneath its volcanic carapace probably represents a middle- to lower-crustal extensional allochthon exhumed during Cretaceous hyperextensional breakup between Australia and Antarctica. |
format |
Article in Journal/Newspaper |
author |
Halpin, Jacqueline A. Crawford, Anthony J. Direen, Nicholas G. Coffin, Millard F. Forbes, Caroline J. Borissova, Irina |
author_facet |
Halpin, Jacqueline A. Crawford, Anthony J. Direen, Nicholas G. Coffin, Millard F. Forbes, Caroline J. Borissova, Irina |
author_sort |
Halpin, Jacqueline A. |
title |
Naturaliste Plateau, offshore western Australia:A submarine window into Gondwana assembly and breakup |
title_short |
Naturaliste Plateau, offshore western Australia:A submarine window into Gondwana assembly and breakup |
title_full |
Naturaliste Plateau, offshore western Australia:A submarine window into Gondwana assembly and breakup |
title_fullStr |
Naturaliste Plateau, offshore western Australia:A submarine window into Gondwana assembly and breakup |
title_full_unstemmed |
Naturaliste Plateau, offshore western Australia:A submarine window into Gondwana assembly and breakup |
title_sort |
naturaliste plateau, offshore western australia:a submarine window into gondwana assembly and breakup |
publishDate |
2008 |
url |
https://researchers.mq.edu.au/en/publications/9f61bf70-67f7-498f-80e8-bcef255b9db5 https://doi.org/10.1130/G25059A.1 http://www.scopus.com/inward/record.url?scp=54949121405&partnerID=8YFLogxK |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Halpin , J A , Crawford , A J , Direen , N G , Coffin , M F , Forbes , C J & Borissova , I 2008 , ' Naturaliste Plateau, offshore western Australia : A submarine window into Gondwana assembly and breakup ' , Geology , vol. 36 , no. 10 , pp. 807-810 . https://doi.org/10.1130/G25059A.1 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1130/G25059A.1 |
container_title |
Geology |
container_volume |
36 |
container_issue |
10 |
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807 |
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1802651248946577408 |