ORCID Profile
0000-0002-4466-7064
Current Organisation
University of Tasmania
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Publisher: American Geophysical Union (AGU)
Date: 02-2011
DOI: 10.1029/2010GC003306
Publisher: Elsevier BV
Date: 08-2006
Publisher: Copernicus GmbH
Date: 03-02-2011
Abstract: Abstract. Vintage 2-D (two dimensional) seismic reflection surveys from the sparsely explored Mentelle Basin (western Australian margin) have been re-processed and integrated with recent high quality seismic survey, and stratigraphic borehole data. Interpretation of these data sets allows the internal geometry of the Mentelle Basin fill and depositional history to be reanalysed with a greater degree of confidence. Basin stratigraphy can be sub ided into several seismically defined megasequences, separated by major unconformities related to both the Valanginian breakup between India-Madagascar and Australia-Antarctica, and tectonically-driven switches in deposition through the Albian. Resting on the Valanginian unconformity are several kilometre-scale mounded structures that formed during late Jurassic to early Cretaceous extension. These have previously been interpreted as volcanic edifices, although direct evidence of volcanic feeder systems is lacking. An alternative interpretation is that these features may be carbonate build-ups. The latter interpretation carries significant climatic ramifications, since carbonate build-ups would have formed at high palaeolatitude, ~60° S. Soon after breakup, initial subsidence resulted in a shallow marine environment and Barremian-Aptian silty-sandy mudstones were deposited. As subsidence continued, thick Albian ferruginous black clays were deposited. Internally, black clay megasequences show previously unresolved unconformities, onlapping and downlapping packages, which reflect a complex depositional, rifting and subsidence history, at odds with their previous interpretation as open marine sediments. Southwestwards migration of the Kerguelen hotspot led to thermal contraction and subsidence to the present day water depth (~3000 m). This was accompanied by Turonian-Santonian deposition of massive chalk beds, which are unconformably overlain by pelagic Palaeocene-Holocene sediments. This substantial unconformity is related to the diachronous breakup and onset of slow spreading between Australia and Antarctica, which may have led to the reactivation and inversion of basement faults, followed by rapid seafloor spreading from the middle Eocene to the present.
Publisher: Informa UK Limited
Date: 12-2005
DOI: 10.1071/EG05357
Publisher: Informa UK Limited
Date: 08-2003
Publisher: Elsevier BV
Date: 10-2008
Publisher: Elsevier BV
Date: 10-2015
Publisher: Elsevier BV
Date: 08-2008
Publisher: Informa UK Limited
Date: 09-2001
DOI: 10.1071/EG01252
Publisher: Elsevier BV
Date: 08-2008
Publisher: Informa UK Limited
Date: 08-2003
Publisher: American Geophysical Union (AGU)
Date: 05-2013
DOI: 10.1002/JGRB.50168
Publisher: Elsevier BV
Date: 08-2016
Publisher: Geological Society of London
Date: 2001
Publisher: Society of Economic Geologists
Date: 12-2007
Publisher: Copernicus GmbH
Date: 07-07-2011
Abstract: Abstract. Vintage 2-D (two-dimensional) seismic reflection surveys from the sparsely explored Mentelle Basin (western Australian margin) have been reprocessed and integrated with a recent high-quality 2-D seismic survey and stratigraphic borehole data. Interpretation of these data sets allows the internal geometry of the Mentelle Basin fill and depositional history to be reanalysed and new insights into its formation revealed. Basin stratigraphy can be sub ided into several seismically defined megasequences separated by major unconformities related to both breakup between India-Madagascar and Australia-Antarctica in the Valanginian-Late Hauterivian and tectonically-driven switches in deposition through the Albian. Resting on the Valanginian-Late Hauterivian breakup unconformity are several kilometre-scale mounded structures that formed during Late Jurassic to Early Cretaceous extension. These have previously been interpreted as volcanic edifices although direct evidence of volcanic feeder systems is lacking. An alternative interpretation is that these features may be carbonate build-ups. The latter interpretation carries significant climatic ramifications since carbonate build-ups would have formed at high palaeolatitude, ~60° S. Soon after breakup, initial subsidence resulted in a shallow marine environment and deposition of Barremian-Aptian silty-sandy mudstones. As subsidence continued, thick successions of Albian ferruginous black clays were deposited. Internally, seismic megasequences composed of successions of black clays show previously unresolved unconformities, onlapping and downlapping packages, which reflect a complex depositional, rifting and subsidence history at odds with their previous interpretation as open marine sediments. Southwestwards migration of the Kerguelen hotspot led to thermal contraction and subsidence to the present day water depth (~3000 m). This was accompanied by Turonian-Santonian deposition of massive chalk beds, which are unconformably overlain by pelagic Palaeocene-Holocene sediments. This substantial unconformity is related to the diachronous breakup and onset of slow spreading between Australia and Antarctica, which may have led to the reactivation and inversion of basement faults and was followed by rapid seafloor spreading from the Middle Eocene to the present.
Publisher: Elsevier BV
Date: 11-2004
Publisher: Informa UK Limited
Date: 03-1997
DOI: 10.1071/EG997034
Publisher: American Association of Petroleum Geologists AAPG/Datapages
Date: 03-2015
DOI: 10.1306/10021414045
Publisher: Informa UK Limited
Date: 12-2006
Publisher: Springer Science and Business Media LLC
Date: 09-2004
Publisher: Geological Society of London
Date: 2001
Publisher: Geological Society of London
Date: 12-2003
Publisher: Geological Society of London
Date: 19-03-2013
DOI: 10.1144/SP369.4
Publisher: Geological Society of London
Date: 2007
DOI: 10.1144/SP282.12
Publisher: Geological Society of London
Date: 2007
DOI: 10.1144/SP282.1
Publisher: Springer-Verlag
Date: 2006
Publisher: Elsevier BV
Date: 02-2020
Publisher: Elsevier BV
Date: 30-11-2005
Publisher: Elsevier BV
Date: 06-2005
Publisher: Geological Society of America
Date: 2006
DOI: 10.1130/G22222.1
Publisher: American Association for the Advancement of Science (AAAS)
Date: 25-07-2008
Abstract: Whittaker et al . (Reports, 5 October 2007, p. 83) presented reconstructions for Australia and Antarctica showing a change in relative plate motion ∼53 million years ago, coincident with an inferred major global plate reorganization. This comment addresses problematic areas in their assumptions and the geological consequences of their reconstructions.
Publisher: Informa UK Limited
Date: 12-2013
Publisher: Informa UK Limited
Date: 03-10-2017
Publisher: Informa UK Limited
Date: 04-2008
Publisher: Informa UK Limited
Date: 03-1997
DOI: 10.1071/EG997029
Publisher: Informa UK Limited
Date: 12-2001
Publisher: Informa UK Limited
Date: 12-2004
Publisher: Geological Society of America
Date: 2008
DOI: 10.1130/G25059A.1
Publisher: Informa UK Limited
Date: 08-2003
Publisher: Informa UK Limited
Date: 09-1998
DOI: 10.1071/EG998330
Publisher: Elsevier BV
Date: 2011
Publisher: Springer Science and Business Media LLC
Date: 03-02-2015
DOI: 10.1038/SREP08218
Publisher: Informa UK Limited
Date: 04-2002
Location: United States of America
No related grants have been discovered for Nicholas G Direen.