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Crustal architecture of the oblique-slip conjugate margins of George V Land and southeast Australia


Stagg, HMJ and Reading, AM, Crustal architecture of the oblique-slip conjugate margins of George V Land and southeast Australia, Antarctica: A Keystone in a Changing World - Online Proceedings of the 10th ISAES, 26 August - 1 September 2007, University of California, Santa Barbara, CA, USA, pp. (2007-1047:109) 1-6. ISSN 0196-1497 (2007) [Refereed Conference Paper]


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Copyright 2007 the Authors

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DOI: doi:10.3133/of2007-1047.srp109


A conceptual, lithospheric-scale cross-section of the conjugate, oblique-slip margins of George V Land, East Antarctica, and southeast Australia (Otway Basin) has been constructed based on the integration of seismic and sample data. This cross-section is characterised by asymmetry in width and thickness, and depth-dependent crustal extension at breakup in the latest Maastrichtian. The broad Antarctic margin (~360 km apparent rift width) developed on thick crust (~42 km) of the Antarctic craton, whereas the narrow Otway margin (~220 km) developed on the thinner crust (~31 km) of the Ross–Delamerian Orogen. The shallow basement (velocities ~5.5 km.s-1) and the deep continental crust (velocities >6.4 km.s-1) appear to be largely absent across the central rift, while the mid-crustal, probably granitic layer (velocities ~6 km.s-1) is preserved. Comparison with published numerical models suggests that the shallow basement and deep crust may have been removed by simple shear, whereas the mid-crust has been ductilely deformed.

Item Details

Item Type:Refereed Conference Paper
Keywords:crustal architecture, oblique-slip conjugate margins
Research Division:Earth Sciences
Research Group:Geophysics
Research Field:Seismology and seismic exploration
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Reading, AM (Professor Anya Reading)
ID Code:78384
Year Published:2007
Deposited By:Earth Sciences
Deposited On:2012-06-25
Last Modified:2014-10-14
Downloads:293 View Download Statistics

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