University Of Tasmania
Crustal architecture of the oblique-slip conjugate margins of George V Land and southeast Australia.pdf (1.8 MB)
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Crustal architecture of the oblique-slip conjugate margins of George V Land and southeast Australia

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conference contribution
posted on 2023-05-23, 06:47 authored by Stagg, HMJ, Anya ReadingAnya Reading
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.


Publication title

Antarctica: A Keystone in a Changing World - Online Proceedings of the 10th ISAES


AK Cooper and CR Raymond et al






School of Natural Sciences


US Geological Survey and The National Academies Press

Place of publication


Event title

10th International Symposium on Antarctic Earth Sciences (ISAES X - 2007)

Event Venue

University of California, Santa Barbara, CA, USA

Date of Event (Start Date)


Date of Event (End Date)


Rights statement

Copyright 2007 the Authors

Repository Status

  • Open

Socio-economic Objectives

Expanding knowledge in the earth sciences

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