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Developing a consistent sequence stratigraphy for the Wilkes Land and Great Australian Bight margins

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Lane, H and Muller, RD and Totterdell, JM and Whittaker, JM (2012) Developing a consistent sequence stratigraphy for the Wilkes Land and Great Australian Bight margins. In: Eastern Australasian Basins Symposium IV, 10-14 September 2012, Brisbane, QLD.

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Abstract

The conjugate margins of Wilkes Land, Antarctica, and the
Great Australian Bight (GAB) are amongst the least understood
continental margins. Breakup along the GAB–Wilkes Land part of
the Australian–Antarctic margin commenced at approximately 83
Ma. Using recent stratigraphic interpretations developed for the
GAB, we have established a sequence stratigraphy for the Wilkes
Land margin that will, for the first time, allow for a unified study of
the conjugate margins. By reconstructing the two margins to their
positions prior to breakup, we were able to identify comparable
packages on the Wilkes Land margin to those recognised on the
GAB margin. Excluding the glacial sediments on the Antarctic
margin, the sedimentary sequence along the Wilkes Land margin
is very thin compared to the GAB margin, which has substantially
more syn- and post-rift sediments. Despite the differences in
thickness, the syn-rift sedimentary package on the Wilkes Land
margin exhibits a similar style of extensional faulting and seismic
character to its GAB margin counterpart. In comparison, post-rift
sequences on the Wilkes Land margin are markedly different in
geometry and seismic character from those found on the GAB
margin. Isopach mapping shows substantial differences in the
thickness of the post-breakup sediments, suggesting different
sediment sources for the two margins. The Late Cretaceous
interval termed the “Hammerhead Supersequence” provides much
of the post-rift thickness for the GAB margin as a result of large
sediment influx into the basin. This supersequence is characterised
by a thick progradational succession and was deposited in fluviodeltaic
and marine environments. The equivalent succession on
the Wilkes Land margin has a different seismic character. It is
thinner and aggradational, which is interpreted to represent a distal
marine environment of deposition.

Item Type: Conference or Workshop Item (Paper)
Additional Information:

Copyright 2012 PESA

Date Deposited: 27 Aug 2013 00:10
Last Modified: 18 Nov 2014 04:53
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