Re-evaluation of Mentelle Basin, a polyphase rifted margin basin, offshore southwest Australia: new insights from integrated regional seismic datasets
Vintage 2-D (two-dimensional) seismic reflectionsurveys from the sparsely explored Mentelle Basin (westernAustralian margin) have been reprocessed and integratedwith a recent high-quality 2-D seismic survey and stratigraphicborehole data. Interpretation of these data sets allowsthe internal geometry...
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ftunivtasecite:oai:ecite.utas.edu.au:74911 2023-05-15T13:59:47+02:00 Re-evaluation of Mentelle Basin, a polyphase rifted margin basin, offshore southwest Australia: new insights from integrated regional seismic datasets Maloney, D Sargent, C Direen, N Hobbs, RW Grocke, DR 2011 application/pdf https://doi.org/10.5194/se-2-107-2011 http://ecite.utas.edu.au/74911 en eng Copernicus GmbH http://ecite.utas.edu.au/74911/1/Maloney_etal_11_SE-2-107-2011.pdf http://dx.doi.org/10.5194/se-2-107-2011 Maloney, D and Sargent, C and Direen, N and Hobbs, RW and Grocke, DR, Re-evaluation of Mentelle Basin, a polyphase rifted margin basin, offshore southwest Australia: new insights from integrated regional seismic datasets, Solid Earth, 2, (2) pp. 107-123. ISSN 1869-9510 (2011) [Refereed Article] http://ecite.utas.edu.au/74911 Earth Sciences Geology Structural geology and tectonics Refereed Article PeerReviewed 2011 ftunivtasecite https://doi.org/10.5194/se-2-107-2011 2022-08-29T22:16:42Z Vintage 2-D (two-dimensional) seismic reflectionsurveys from the sparsely explored Mentelle Basin (westernAustralian margin) have been reprocessed and integratedwith a recent high-quality 2-D seismic survey and stratigraphicborehole data. Interpretation of these data sets allowsthe internal geometry of the Mentelle Basin fill anddepositional history to be reanalysed and new insights intoits formation revealed. Basin stratigraphy can be subdividedinto several seismically defined megasequences separated bymajor unconformities related to both breakup between India-Madagascar and Australia-Antarctica in the Valanginian-Late Hauterivian and tectonically-driven switches in depositionthrough the Albian.Resting on the Valanginian-Late Hauterivian breakup unconformityare several kilometre-scale mounded structuresthat formed during Late Jurassic to Early Cretaceous extension.These have previously been interpreted as volcanic edificesalthough direct evidence of volcanic feeder systems islacking. An alternative interpretation is that these featuresmay be carbonate build-ups. The latter interpretation carriessignificant climatic ramifications since carbonate build-upswould have formed at high palaeolatitude, ~60degree S.Soon after breakup, initial subsidence resulted in a shallowmarine environment and deposition of Barremian-Aptiansilty-sandy mudstones. As subsidence continued, thick successionsof Albian ferruginous black clays were deposited.Internally, seismic megasequences composed of successionsof black clays show previously unresolved unconformities,onlapping and downlapping packages, which reflect a com-plex depositional, rifting and subsidence history at odds withtheir previous interpretation as open marine sediments.Southwestwards migration of the Kerguelen hotspot led tothermal contraction and subsidence to the present day waterdepth (~3000 m). This was accompanied by Turonian-Santonian deposition of massive chalk beds, which are unconformablyoverlain by pelagic Palaeocene-Holocene sediments.This substantial ... Article in Journal/Newspaper Antarc* Antarctica eCite UTAS (University of Tasmania) Kerguelen Solid Earth 2 2 107 123 |
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Open Polar |
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eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Geology Structural geology and tectonics |
spellingShingle |
Earth Sciences Geology Structural geology and tectonics Maloney, D Sargent, C Direen, N Hobbs, RW Grocke, DR Re-evaluation of Mentelle Basin, a polyphase rifted margin basin, offshore southwest Australia: new insights from integrated regional seismic datasets |
topic_facet |
Earth Sciences Geology Structural geology and tectonics |
description |
Vintage 2-D (two-dimensional) seismic reflectionsurveys from the sparsely explored Mentelle Basin (westernAustralian margin) have been reprocessed and integratedwith a recent high-quality 2-D seismic survey and stratigraphicborehole data. Interpretation of these data sets allowsthe internal geometry of the Mentelle Basin fill anddepositional history to be reanalysed and new insights intoits formation revealed. Basin stratigraphy can be subdividedinto several seismically defined megasequences separated bymajor unconformities related to both breakup between India-Madagascar and Australia-Antarctica in the Valanginian-Late Hauterivian and tectonically-driven switches in depositionthrough the Albian.Resting on the Valanginian-Late Hauterivian breakup unconformityare several kilometre-scale mounded structuresthat formed during Late Jurassic to Early Cretaceous extension.These have previously been interpreted as volcanic edificesalthough direct evidence of volcanic feeder systems islacking. An alternative interpretation is that these featuresmay be carbonate build-ups. The latter interpretation carriessignificant climatic ramifications since carbonate build-upswould have formed at high palaeolatitude, ~60degree S.Soon after breakup, initial subsidence resulted in a shallowmarine environment and deposition of Barremian-Aptiansilty-sandy mudstones. As subsidence continued, thick successionsof Albian ferruginous black clays were deposited.Internally, seismic megasequences composed of successionsof black clays show previously unresolved unconformities,onlapping and downlapping packages, which reflect a com-plex depositional, rifting and subsidence history at odds withtheir previous interpretation as open marine sediments.Southwestwards migration of the Kerguelen hotspot led tothermal contraction and subsidence to the present day waterdepth (~3000 m). This was accompanied by Turonian-Santonian deposition of massive chalk beds, which are unconformablyoverlain by pelagic Palaeocene-Holocene sediments.This substantial ... |
format |
Article in Journal/Newspaper |
author |
Maloney, D Sargent, C Direen, N Hobbs, RW Grocke, DR |
author_facet |
Maloney, D Sargent, C Direen, N Hobbs, RW Grocke, DR |
author_sort |
Maloney, D |
title |
Re-evaluation of Mentelle Basin, a polyphase rifted margin basin, offshore southwest Australia: new insights from integrated regional seismic datasets |
title_short |
Re-evaluation of Mentelle Basin, a polyphase rifted margin basin, offshore southwest Australia: new insights from integrated regional seismic datasets |
title_full |
Re-evaluation of Mentelle Basin, a polyphase rifted margin basin, offshore southwest Australia: new insights from integrated regional seismic datasets |
title_fullStr |
Re-evaluation of Mentelle Basin, a polyphase rifted margin basin, offshore southwest Australia: new insights from integrated regional seismic datasets |
title_full_unstemmed |
Re-evaluation of Mentelle Basin, a polyphase rifted margin basin, offshore southwest Australia: new insights from integrated regional seismic datasets |
title_sort |
re-evaluation of mentelle basin, a polyphase rifted margin basin, offshore southwest australia: new insights from integrated regional seismic datasets |
publisher |
Copernicus GmbH |
publishDate |
2011 |
url |
https://doi.org/10.5194/se-2-107-2011 http://ecite.utas.edu.au/74911 |
geographic |
Kerguelen |
geographic_facet |
Kerguelen |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
http://ecite.utas.edu.au/74911/1/Maloney_etal_11_SE-2-107-2011.pdf http://dx.doi.org/10.5194/se-2-107-2011 Maloney, D and Sargent, C and Direen, N and Hobbs, RW and Grocke, DR, Re-evaluation of Mentelle Basin, a polyphase rifted margin basin, offshore southwest Australia: new insights from integrated regional seismic datasets, Solid Earth, 2, (2) pp. 107-123. ISSN 1869-9510 (2011) [Refereed Article] http://ecite.utas.edu.au/74911 |
op_doi |
https://doi.org/10.5194/se-2-107-2011 |
container_title |
Solid Earth |
container_volume |
2 |
container_issue |
2 |
container_start_page |
107 |
op_container_end_page |
123 |
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1766268598431514624 |