Developing a consistent sequence stratigraphy for the Wilkes Land and Great Australian Bight margins
The conjugate margins of Wilkes Land, Antarctica, and theGreat Australian Bight (GAB) are amongst the least understoodcontinental margins. Breakup along the GABWilkes Land part ofthe AustralianAntarctic margin commenced at approximately 83Ma. Using recent stratigraphic interpretations developed for...
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ftunivtasecite:oai:ecite.utas.edu.au:84450 2023-05-15T14:02:31+02:00 Developing a consistent sequence stratigraphy for the Wilkes Land and Great Australian Bight margins Lane, H Muller, RD Totterdell, JM Whittaker, J 2012 application/pdf http://www.earthbyte.org/publications.html http://ecite.utas.edu.au/84450 en eng Petroleum Exploration Society of Australia http://ecite.utas.edu.au/84450/1/Lane_etal_EABS4_2012.pdf Lane, H and Muller, RD and Totterdell, JM and Whittaker, J, Developing a consistent sequence stratigraphy for the Wilkes Land and Great Australian Bight margins, Eastern Australasian Basins Symposium IV, 10-14 September 2012, Brisbane, QLD, pp. 1-13. (2012) [Refereed Conference Paper] http://ecite.utas.edu.au/84450 Earth Sciences Geology Marine Geoscience Refereed Conference Paper PeerReviewed 2012 ftunivtasecite 2019-12-13T21:48:52Z The conjugate margins of Wilkes Land, Antarctica, and theGreat Australian Bight (GAB) are amongst the least understoodcontinental margins. Breakup along the GABWilkes Land part ofthe AustralianAntarctic margin commenced at approximately 83Ma. Using recent stratigraphic interpretations developed for theGAB, we have established a sequence stratigraphy for the WilkesLand margin that will, for the first time, allow for a unified study ofthe conjugate margins. By reconstructing the two margins to theirpositions prior to breakup, we were able to identify comparablepackages on the Wilkes Land margin to those recognised on theGAB margin. Excluding the glacial sediments on the Antarcticmargin, the sedimentary sequence along the Wilkes Land marginis very thin compared to the GAB margin, which has substantiallymore syn- and post-rift sediments. Despite the differences inthickness, the syn-rift sedimentary package on the Wilkes Landmargin exhibits a similar style of extensional faulting and seismiccharacter to its GAB margin counterpart. In comparison, post-riftsequences on the Wilkes Land margin are markedly different ingeometry and seismic character from those found on the GABmargin. Isopach mapping shows substantial differences in thethickness of the post-breakup sediments, suggesting differentsediment sources for the two margins. The Late Cretaceousinterval termed the Hammerhead Supersequence provides muchof the post-rift thickness for the GAB margin as a result of largesediment influx into the basin. This supersequence is characterisedby a thick progradational succession and was deposited in fluviodeltaicand marine environments. The equivalent succession onthe Wilkes Land margin has a different seismic character. It isthinner and aggradational, which is interpreted to represent a distalmarine environment of deposition. Conference Object Antarc* Antarctica Wilkes Land eCite UTAS (University of Tasmania) Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) |
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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 Marine Geoscience |
spellingShingle |
Earth Sciences Geology Marine Geoscience Lane, H Muller, RD Totterdell, JM Whittaker, J Developing a consistent sequence stratigraphy for the Wilkes Land and Great Australian Bight margins |
topic_facet |
Earth Sciences Geology Marine Geoscience |
description |
The conjugate margins of Wilkes Land, Antarctica, and theGreat Australian Bight (GAB) are amongst the least understoodcontinental margins. Breakup along the GABWilkes Land part ofthe AustralianAntarctic margin commenced at approximately 83Ma. Using recent stratigraphic interpretations developed for theGAB, we have established a sequence stratigraphy for the WilkesLand margin that will, for the first time, allow for a unified study ofthe conjugate margins. By reconstructing the two margins to theirpositions prior to breakup, we were able to identify comparablepackages on the Wilkes Land margin to those recognised on theGAB margin. Excluding the glacial sediments on the Antarcticmargin, the sedimentary sequence along the Wilkes Land marginis very thin compared to the GAB margin, which has substantiallymore syn- and post-rift sediments. Despite the differences inthickness, the syn-rift sedimentary package on the Wilkes Landmargin exhibits a similar style of extensional faulting and seismiccharacter to its GAB margin counterpart. In comparison, post-riftsequences on the Wilkes Land margin are markedly different ingeometry and seismic character from those found on the GABmargin. Isopach mapping shows substantial differences in thethickness of the post-breakup sediments, suggesting differentsediment sources for the two margins. The Late Cretaceousinterval termed the Hammerhead Supersequence provides muchof the post-rift thickness for the GAB margin as a result of largesediment influx into the basin. This supersequence is characterisedby a thick progradational succession and was deposited in fluviodeltaicand marine environments. The equivalent succession onthe Wilkes Land margin has a different seismic character. It isthinner and aggradational, which is interpreted to represent a distalmarine environment of deposition. |
format |
Conference Object |
author |
Lane, H Muller, RD Totterdell, JM Whittaker, J |
author_facet |
Lane, H Muller, RD Totterdell, JM Whittaker, J |
author_sort |
Lane, H |
title |
Developing a consistent sequence stratigraphy for the Wilkes Land and Great Australian Bight margins |
title_short |
Developing a consistent sequence stratigraphy for the Wilkes Land and Great Australian Bight margins |
title_full |
Developing a consistent sequence stratigraphy for the Wilkes Land and Great Australian Bight margins |
title_fullStr |
Developing a consistent sequence stratigraphy for the Wilkes Land and Great Australian Bight margins |
title_full_unstemmed |
Developing a consistent sequence stratigraphy for the Wilkes Land and Great Australian Bight margins |
title_sort |
developing a consistent sequence stratigraphy for the wilkes land and great australian bight margins |
publisher |
Petroleum Exploration Society of Australia |
publishDate |
2012 |
url |
http://www.earthbyte.org/publications.html http://ecite.utas.edu.au/84450 |
long_lat |
ENVELOPE(120.000,120.000,-69.000,-69.000) |
geographic |
Wilkes Land |
geographic_facet |
Wilkes Land |
genre |
Antarc* Antarctica Wilkes Land |
genre_facet |
Antarc* Antarctica Wilkes Land |
op_relation |
http://ecite.utas.edu.au/84450/1/Lane_etal_EABS4_2012.pdf Lane, H and Muller, RD and Totterdell, JM and Whittaker, J, Developing a consistent sequence stratigraphy for the Wilkes Land and Great Australian Bight margins, Eastern Australasian Basins Symposium IV, 10-14 September 2012, Brisbane, QLD, pp. 1-13. (2012) [Refereed Conference Paper] http://ecite.utas.edu.au/84450 |
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1766272826393755648 |