Tectonic Evolution and Continental Fragmentation of the Southern West Australian Margin
Continental rocks dredged in 2011 show that the BataviaKnoll and Gulden Draak Knoll, two prominent bathymetricfeatures located ~1600 km offshore Perth, are micro-continents.Plate tectonic modeling reconstructs the pre-rift position ofthese knolls to the north and south of the Naturaliste Plateau,res...
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ftunivtasecite:oai:ecite.utas.edu.au:86218 2023-05-15T13:37:23+02:00 Tectonic Evolution and Continental Fragmentation of the Southern West Australian Margin Whittaker, J Halpin, JA Williams, SE Hall, LS Gardner, R Kobler, ME Daczko, NR Muller, RD 2013 application/pdf https://www.aime.com.au/__novadocuments/44419?v=635258742235770000 http://ecite.utas.edu.au/86218 en eng RE Solutions Resource & Energy Services P/L http://ecite.utas.edu.au/86218/1/WABS2013_Whittaker.pdf Whittaker, J and Halpin, JA and Williams, SE and Hall, LS and Gardner, R and Kobler, ME and Daczko, NR and Muller, RD, Tectonic Evolution and Continental Fragmentation of the Southern West Australian Margin, The Sedimentary Basins of Western Australia IV: Proceedings of the Petroleum Exploration Society of Australia Symposium, 18-21 August 2013, Perth, WA, pp. 1-18. (2013) [Refereed Conference Paper] http://ecite.utas.edu.au/86218 Earth Sciences Geology Tectonics Refereed Conference Paper PeerReviewed 2013 ftunivtasecite 2019-12-13T21:50:20Z Continental rocks dredged in 2011 show that the BataviaKnoll and Gulden Draak Knoll, two prominent bathymetricfeatures located ~1600 km offshore Perth, are micro-continents.Plate tectonic modeling reconstructs the pre-rift position ofthese knolls to the north and south of the Naturaliste Plateau,respectively. The Batavia Knoll was conjugate to part of thenorthern Naturaliste Plateau, while the Gulden Draak Knollwas conjugate to the western Bruce Rise, Antarctica. Here,we compare basement rocks, patterns of sedimentation,volcanism and structure on the better studied NaturalistePlateau, Mentelle Basin and Bruce Rise with newly collecteddata from the knolls. Significant volumes of metamorphic andgranitic basement rocks were dredged from both the Bataviaand Gulden Draak knolls. Preliminary geochronological andgeochemical analyses show that these rocks are continental innature and include protolith granitoids that were emplacedduring the Archaean (~2850 Ma) and the Mesoproterozoic(~12901200 Ma) (Gulden Draak Knoll), and during the EarlyPalaeozoic (~540530 Ma) (Batavia Knoll). All metamorphicrocks were invariably reworked during the Kuunga Orogeny(~550500 Ma) during the final assembly of Gondwana.Sediment accumulations are generally relatively thin (upto a few hundred meters) on all the continental fragments,with the exception of NNE to NE oriented rift basins withup to ~2 km of sediments. Sedimentary rocks, predominantlysandstones were dredged from adjacent to the interpretedrift basin locations on both the Batavia and Gulden Draakknolls. Volcanic/intrusive material has been interpreted on thenorthern flank of the Naturaliste Plateau from seismic profiles,but no basalts were found in either of the Batavia Knolldredges. Extensive volcanism has also been interpreted onboth the Naturaliste Plateau and Bruce Rise. Volcanic materialwas dredged in one of two sites on the Gulden Draak Knoll,and geophysical data may support the presence of an igneousdomain. The structural, volcanic and sedimentary nature ofthe knolls will be tested in late-2014 with the collection ofnew magnetic, gravity, seismic reflection and dredge data. Conference Object Antarc* Antarctica eCite UTAS (University of Tasmania) Bruce Rise ENVELOPE(101.250,101.250,-63.500,-63.500) |
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Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Geology Tectonics |
spellingShingle |
Earth Sciences Geology Tectonics Whittaker, J Halpin, JA Williams, SE Hall, LS Gardner, R Kobler, ME Daczko, NR Muller, RD Tectonic Evolution and Continental Fragmentation of the Southern West Australian Margin |
topic_facet |
Earth Sciences Geology Tectonics |
description |
Continental rocks dredged in 2011 show that the BataviaKnoll and Gulden Draak Knoll, two prominent bathymetricfeatures located ~1600 km offshore Perth, are micro-continents.Plate tectonic modeling reconstructs the pre-rift position ofthese knolls to the north and south of the Naturaliste Plateau,respectively. The Batavia Knoll was conjugate to part of thenorthern Naturaliste Plateau, while the Gulden Draak Knollwas conjugate to the western Bruce Rise, Antarctica. Here,we compare basement rocks, patterns of sedimentation,volcanism and structure on the better studied NaturalistePlateau, Mentelle Basin and Bruce Rise with newly collecteddata from the knolls. Significant volumes of metamorphic andgranitic basement rocks were dredged from both the Bataviaand Gulden Draak knolls. Preliminary geochronological andgeochemical analyses show that these rocks are continental innature and include protolith granitoids that were emplacedduring the Archaean (~2850 Ma) and the Mesoproterozoic(~12901200 Ma) (Gulden Draak Knoll), and during the EarlyPalaeozoic (~540530 Ma) (Batavia Knoll). All metamorphicrocks were invariably reworked during the Kuunga Orogeny(~550500 Ma) during the final assembly of Gondwana.Sediment accumulations are generally relatively thin (upto a few hundred meters) on all the continental fragments,with the exception of NNE to NE oriented rift basins withup to ~2 km of sediments. Sedimentary rocks, predominantlysandstones were dredged from adjacent to the interpretedrift basin locations on both the Batavia and Gulden Draakknolls. Volcanic/intrusive material has been interpreted on thenorthern flank of the Naturaliste Plateau from seismic profiles,but no basalts were found in either of the Batavia Knolldredges. Extensive volcanism has also been interpreted onboth the Naturaliste Plateau and Bruce Rise. Volcanic materialwas dredged in one of two sites on the Gulden Draak Knoll,and geophysical data may support the presence of an igneousdomain. The structural, volcanic and sedimentary nature ofthe knolls will be tested in late-2014 with the collection ofnew magnetic, gravity, seismic reflection and dredge data. |
format |
Conference Object |
author |
Whittaker, J Halpin, JA Williams, SE Hall, LS Gardner, R Kobler, ME Daczko, NR Muller, RD |
author_facet |
Whittaker, J Halpin, JA Williams, SE Hall, LS Gardner, R Kobler, ME Daczko, NR Muller, RD |
author_sort |
Whittaker, J |
title |
Tectonic Evolution and Continental Fragmentation of the Southern West Australian Margin |
title_short |
Tectonic Evolution and Continental Fragmentation of the Southern West Australian Margin |
title_full |
Tectonic Evolution and Continental Fragmentation of the Southern West Australian Margin |
title_fullStr |
Tectonic Evolution and Continental Fragmentation of the Southern West Australian Margin |
title_full_unstemmed |
Tectonic Evolution and Continental Fragmentation of the Southern West Australian Margin |
title_sort |
tectonic evolution and continental fragmentation of the southern west australian margin |
publisher |
RE Solutions Resource & Energy Services P/L |
publishDate |
2013 |
url |
https://www.aime.com.au/__novadocuments/44419?v=635258742235770000 http://ecite.utas.edu.au/86218 |
long_lat |
ENVELOPE(101.250,101.250,-63.500,-63.500) |
geographic |
Bruce Rise |
geographic_facet |
Bruce Rise |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
http://ecite.utas.edu.au/86218/1/WABS2013_Whittaker.pdf Whittaker, J and Halpin, JA and Williams, SE and Hall, LS and Gardner, R and Kobler, ME and Daczko, NR and Muller, RD, Tectonic Evolution and Continental Fragmentation of the Southern West Australian Margin, The Sedimentary Basins of Western Australia IV: Proceedings of the Petroleum Exploration Society of Australia Symposium, 18-21 August 2013, Perth, WA, pp. 1-18. (2013) [Refereed Conference Paper] http://ecite.utas.edu.au/86218 |
_version_ |
1766090974700765184 |