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Inherited crustal deformation along the East Gondwana margin revealed by seismic anisotropy tomography

Citation

Pilia, S and Arroucau, P and Rawlinson, N and Reading, AM and Cayley, RA, Inherited crustal deformation along the East Gondwana margin revealed by seismic anisotropy tomography, Geophysical Research Letters, 43, (23) pp. 12082-12090. ISSN 0094-8276 (2016) [Refereed Article]


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Copyright Statement

Copyright 2016 American Geophysical Union

DOI: doi:10.1002/2016GL071201

Abstract

The mechanisms of continental growth are a crucial part of plate tectonic theory, yet a clear understanding of the processes involved remains elusive. Here we determine seismic Rayleigh wave phase anisotropy variations in the crust beneath the southern Tasmanides of Australia, a Paleozoic accretionary margin. Our results reveal a complex, thick-skinned pervasive deformation that was driven by the tectonic interaction between the proto-Pacific Ocean and the ancient eastern margin of Gondwana. Stress-induced effects triggered by the collision and entrainment of a microcontinent into the active subduction zone are evident in the anisotropy signature. The paleofracturing trend of failed rifting between Australia and Antarctica is also recorded in the anisotropy pattern as well as a tightly curved feature in central Tasmania. The observed patterns of anisotropy correlate well with recent geodynamic and kinematic models of the Tasmanides and provide a platform from which the spatial extent of deformational domains can be refined.

Item Details

Item Type:Refereed Article
Keywords:crustal azimuthal anisotropy, ambient noise tomography, East Gondwana, continental accretion, Tasmanides
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
Author:Reading, AM (Professor Anya Reading)
ID Code:114747
Year Published:2016
Funding Support:Australian Research Council (LP110100256)
Web of Science® Times Cited:4
Deposited By:Earth Sciences
Deposited On:2017-02-25
Last Modified:2017-10-25
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