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)...
Published in: | Geology |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
GEOLOGICAL SOC AMER, INC
2008
|
Subjects: | |
Online Access: | https://doi.org/10.1130/G25059A.1 http://ecite.utas.edu.au/56636 |
id |
ftunivtasecite:oai:ecite.utas.edu.au:56636 |
---|---|
record_format |
openpolar |
spelling |
ftunivtasecite:oai:ecite.utas.edu.au:56636 2023-05-15T13:35:38+02:00 Naturaliste Plateau, offshore Western Australia: A submarine window into Gondwana assembly and breakup Halpin, JA Crawford, AJ Direen, N Coffin, MF Forbes, CJ Borissova, I 2008 application/pdf https://doi.org/10.1130/G25059A.1 http://ecite.utas.edu.au/56636 en eng GEOLOGICAL SOC AMER, INC http://ecite.utas.edu.au/56636/1/Halpin_et_al_2008.pdf http://dx.doi.org/10.1130/G25059A.1 Halpin, JA and Crawford, AJ and Direen, N and Coffin, MF and Forbes, CJ and Borissova, I, Naturaliste Plateau, offshore Western Australia: A submarine window into Gondwana assembly and breakup, Geology, 36, (10) pp. 807-810. ISSN 0091-7613 (2008) [Refereed Article] http://ecite.utas.edu.au/56636 Earth Sciences Geology Tectonics Refereed Article PeerReviewed 2008 ftunivtasecite https://doi.org/10.1130/G25059A.1 2019-12-13T21:28:51Z 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. 2008 The Geological Society of America. Article in Journal/Newspaper Antarc* Antarctica eCite UTAS (University of Tasmania) Geology 36 10 807 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Geology Tectonics |
spellingShingle |
Earth Sciences Geology Tectonics Halpin, JA Crawford, AJ Direen, N Coffin, MF Forbes, CJ Borissova, I Naturaliste Plateau, offshore Western Australia: A submarine window into Gondwana assembly and breakup |
topic_facet |
Earth Sciences Geology Tectonics |
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. 2008 The Geological Society of America. |
format |
Article in Journal/Newspaper |
author |
Halpin, JA Crawford, AJ Direen, N Coffin, MF Forbes, CJ Borissova, I |
author_facet |
Halpin, JA Crawford, AJ Direen, N Coffin, MF Forbes, CJ Borissova, I |
author_sort |
Halpin, JA |
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 |
publisher |
GEOLOGICAL SOC AMER, INC |
publishDate |
2008 |
url |
https://doi.org/10.1130/G25059A.1 http://ecite.utas.edu.au/56636 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
http://ecite.utas.edu.au/56636/1/Halpin_et_al_2008.pdf http://dx.doi.org/10.1130/G25059A.1 Halpin, JA and Crawford, AJ and Direen, N and Coffin, MF and Forbes, CJ and Borissova, I, Naturaliste Plateau, offshore Western Australia: A submarine window into Gondwana assembly and breakup, Geology, 36, (10) pp. 807-810. ISSN 0091-7613 (2008) [Refereed Article] http://ecite.utas.edu.au/56636 |
op_doi |
https://doi.org/10.1130/G25059A.1 |
container_title |
Geology |
container_volume |
36 |
container_issue |
10 |
container_start_page |
807 |
_version_ |
1766068125718020096 |