Crustal architecture of the oblique-slip conjugate margins of George V Land and southeast Australia
Open-File Report
2007-1047-SRP-109
By: H.M.J. Stagg and A.M. Reading
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Abstract
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.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Crustal architecture of the oblique-slip conjugate margins of George V Land and southeast Australia |
| Series title | Open-File Report |
| Series number | 2007-1047-SRP-109 |
| DOI | 10.3133/ofr20071047SRP109 |
| Year Published | 2007 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Description | 6 p. |
| Larger Work Type | Report |
| Larger Work Subtype | USGS Numbered Series |
| Larger Work Title | Antarctica: A Keystone in a Changing World--Online Proceedings for the Tenth International Symposium on Antarctic Earth Sciences. Santa Barbara, California, U.S.A.--August 26 to September 1, 2007 |
| Other Geospatial | Antarctica |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |