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


Direen, N and Stagg, HMJ and Symonds, PA and Colwell, JB, Dominant symmetry of a conjugate southern Australian and East Antarctic magma-poor rifted margin segment, Geochemistry Geophysics Geosystems, 12, (2) pp. Q02006. ISSN 1525-2027 (2011) [Refereed Article]

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Copyright Š 20011 American Geophysical Union.

DOI: doi:10.1029/2010GC003306


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¨C70 km wide continentŠ\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 IberiaŠ\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 Details

Item Type:Refereed Article
Keywords:antarctc margin tectonics
Research Division:Earth Sciences
Research Group:Geology
Research Field:Structural geology and tectonics
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Direen, N (Dr Nicholas Direen)
ID Code:74066
Year Published:2011
Web of Science® Times Cited:42
Deposited By:Earth Sciences
Deposited On:2011-11-10
Last Modified:2012-04-30
Downloads:3 View Download Statistics

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