Dominant symmetry of a conjugate southern Australian and East Antarctic magma‐poor rifted margin segment
Synthesis and modeling of published deep seismic and potential field data from the conjugate, magmapoor, rifted margins of the Great Australian Bight, southern Australia, and central Wilkes Land, East Antarctica, show that there is pronounced symmetry of structures in a 300 km wide zone straddling t...
Published in: | Geochemistry, Geophysics, Geosystems |
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Online Access: | https://eprints.utas.edu.au/10728/ https://eprints.utas.edu.au/10728/1/Direen_etal_10_SRS_2010GC003306.pdf https://doi.org/10.1029/2010GC003306 |
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ftunivtasmania:oai:eprints.utas.edu.au:10728 2023-05-15T13:36:47+02:00 Dominant symmetry of a conjugate southern Australian and East Antarctic magma‐poor rifted margin segment Direen, NG Stagg, HMJ Symonds, PA Colwell, JB 2011 application/pdf https://eprints.utas.edu.au/10728/ https://eprints.utas.edu.au/10728/1/Direen_etal_10_SRS_2010GC003306.pdf https://doi.org/10.1029/2010GC003306 en eng https://eprints.utas.edu.au/10728/1/Direen_etal_10_SRS_2010GC003306.pdf Direen, NG, Stagg, HMJ, Symonds, PA and Colwell, JB 2011 , 'Dominant symmetry of a conjugate southern Australian and East Antarctic magma‐poor rifted margin segment' , Geochemistry Geophysics Geosystems, vol. 12, no. 2 , doi:10.1029/2010GC003306 <http://dx.doi.org/10.1029/2010GC003306>. cc_utas Article PeerReviewed 2011 ftunivtasmania https://doi.org/10.1029/2010GC003306 2020-05-30T07:24:26Z Synthesis and modeling of published deep seismic and potential field data from the conjugate, magmapoor, rifted margins of the Great Australian Bight, southern Australia, and central Wilkes Land, East Antarctica, show that there is pronounced symmetry of structures in a 300 km wide zone straddling the axis of final breakup. This symmetry is observed consistently for a distance of some hundreds of kilometers along strike. From inboard to outboard, both margins comprise a narrow zone of attenuation of the crystalline continental crust; an approximately 4 km high basement ridge, interpreted as unroofed peridotites, at the location of maximum thinning of the continental crust; and a 60–70 km wide continent‐ocean transition zone that contains a sedimentary basin that may be underlain by altered mantle and fragments of crystalline continental crust. The marked breakup symmetry described here is in contrast to the asymmetry of the Iberia‐Newfoundland margin and is consistent with the operation of a symmetrical extensional detachment system deforming the whole crust in the center of the rift, as envisaged by some numerical models for the continental rifting process. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Newfoundland Wilkes Land University of Tasmania: UTas ePrints Antarctic East Antarctica Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) Geochemistry, Geophysics, Geosystems 12 2 n/a n/a |
institution |
Open Polar |
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University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
English |
description |
Synthesis and modeling of published deep seismic and potential field data from the conjugate, magmapoor, rifted margins of the Great Australian Bight, southern Australia, and central Wilkes Land, East Antarctica, show that there is pronounced symmetry of structures in a 300 km wide zone straddling the axis of final breakup. This symmetry is observed consistently for a distance of some hundreds of kilometers along strike. From inboard to outboard, both margins comprise a narrow zone of attenuation of the crystalline continental crust; an approximately 4 km high basement ridge, interpreted as unroofed peridotites, at the location of maximum thinning of the continental crust; and a 60–70 km wide continent‐ocean transition zone that contains a sedimentary basin that may be underlain by altered mantle and fragments of crystalline continental crust. The marked breakup symmetry described here is in contrast to the asymmetry of the Iberia‐Newfoundland margin and is consistent with the operation of a symmetrical extensional detachment system deforming the whole crust in the center of the rift, as envisaged by some numerical models for the continental rifting process. |
format |
Article in Journal/Newspaper |
author |
Direen, NG Stagg, HMJ Symonds, PA Colwell, JB |
spellingShingle |
Direen, NG Stagg, HMJ Symonds, PA Colwell, JB Dominant symmetry of a conjugate southern Australian and East Antarctic magma‐poor rifted margin segment |
author_facet |
Direen, NG Stagg, HMJ Symonds, PA Colwell, JB |
author_sort |
Direen, NG |
title |
Dominant symmetry of a conjugate southern Australian and East Antarctic magma‐poor rifted margin segment |
title_short |
Dominant symmetry of a conjugate southern Australian and East Antarctic magma‐poor rifted margin segment |
title_full |
Dominant symmetry of a conjugate southern Australian and East Antarctic magma‐poor rifted margin segment |
title_fullStr |
Dominant symmetry of a conjugate southern Australian and East Antarctic magma‐poor rifted margin segment |
title_full_unstemmed |
Dominant symmetry of a conjugate southern Australian and East Antarctic magma‐poor rifted margin segment |
title_sort |
dominant symmetry of a conjugate southern australian and east antarctic magma‐poor rifted margin segment |
publishDate |
2011 |
url |
https://eprints.utas.edu.au/10728/ https://eprints.utas.edu.au/10728/1/Direen_etal_10_SRS_2010GC003306.pdf https://doi.org/10.1029/2010GC003306 |
long_lat |
ENVELOPE(120.000,120.000,-69.000,-69.000) |
geographic |
Antarctic East Antarctica Wilkes Land |
geographic_facet |
Antarctic East Antarctica Wilkes Land |
genre |
Antarc* Antarctic Antarctica East Antarctica Newfoundland Wilkes Land |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Newfoundland Wilkes Land |
op_relation |
https://eprints.utas.edu.au/10728/1/Direen_etal_10_SRS_2010GC003306.pdf Direen, NG, Stagg, HMJ, Symonds, PA and Colwell, JB 2011 , 'Dominant symmetry of a conjugate southern Australian and East Antarctic magma‐poor rifted margin segment' , Geochemistry Geophysics Geosystems, vol. 12, no. 2 , doi:10.1029/2010GC003306 <http://dx.doi.org/10.1029/2010GC003306>. |
op_rights |
cc_utas |
op_doi |
https://doi.org/10.1029/2010GC003306 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
12 |
container_issue |
2 |
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n/a |
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n/a |
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1766083968402194432 |