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Dominant symmetry of a conjugate southern Australian and East Antarctic magma‐poor rifted margin segment

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Direen, NG and Stagg, HMJ and Symonds, PA and Colwell, JB (2011) Dominant symmetry of a conjugate southern Australian and East Antarctic magma‐poor rifted margin segment. Geochemistry Geophysics Geosystems, 12 (2). ISSN 1525-2027

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Abstract

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.

Item Type: Article
Journal or Publication Title: Geochemistry Geophysics Geosystems
ISSN: 1525-2027
Identification Number - DOI: 10.1029/2010GC003306
Additional Information: Copyright © 2011 American Geophysical Union
Date Deposited: 27 Apr 2011 03:25
Last Modified: 27 Apr 2011 03:25
URI: http://eprints.utas.edu.au/id/eprint/10728
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