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Australian-Antarctic rifting

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Whittaker, JM and Muller, RD and Goncharov, A (2008) Australian-Antarctic rifting. In: PESA Eastern Australasian Basins Symposium III, 14-17 September 2008, Sydney, Australia.

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Abstract

Rifting between Australia and Antarctic began as early as 140
MM years ago. However, the timing of continental breakup and the
manner in which rifting proceeded have remained controversial.
A major reason for the ambiguity surrounding the Australian-
Antarctic breakup and early spreading history is the lack of a
clear boundary between continental and oceanic crust. Instead of a
sharp boundary there is a zone of transitional crust, up to 120 km
in width, along the entire conjugate southern Australian and east
Antarctic margins (Sayers et al. 2001). The presence of wide zones
of so-called transitional crustal on conjugate rifted Australian-
Antarctic margins have resulted in considerable scientifi c debate
regarding the nature of the transitional crust. Here we assess
the ability of available data to discriminate between different
hypotheses regarding the nature of the crust of the Australian-
Antarctic conjugate transition zones. We also assess the suitability
of applying depth-dependent rifting models recently developed for
the well-studied Iberian-Newfoundland conjugate margins to the
Australian-Antarctic context in order to resolve the nature of the
transitional crust and the manner in which it formed.

Item Type: Conference or Workshop Item (Paper)
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Copyright 2008 PESA

Date Deposited: 27 Aug 2013 00:08
Last Modified: 18 Nov 2014 04:53
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