Paleomagnetic data from the New England Orogen (eastern Australia) and implications for oroclinal bending

Shaanan, Uri, Rosenbaum, Gideon, Pisarevsky, Sergei and Speranza, Fabio (2015) Paleomagnetic data from the New England Orogen (eastern Australia) and implications for oroclinal bending. Tectonophysics, 664 182-190. doi:10.1016/j.tecto.2015.09.018

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Author Shaanan, Uri
Rosenbaum, Gideon
Pisarevsky, Sergei
Speranza, Fabio
Title Paleomagnetic data from the New England Orogen (eastern Australia) and implications for oroclinal bending
Journal name Tectonophysics   Check publisher's open access policy
ISSN 0040-1951
Publication date 2015-11-28
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.tecto.2015.09.018
Open Access Status File (Author Post-print)
Volume 664
Start page 182
End page 190
Total pages 43
Place of publication Amsterdam, The Netherlands
Publisher Elsevier
Collection year 2016
Language eng
Abstract Orogenic curvatures (oroclines) are common in modern and ancient orogens, but the geodynamic driving forces of many oroclines remain controversial. Here we focus on the New England oroclines of eastern Australia, the formation of which had been previously broadly constrained to the Early–Middle Permian. This time interval encompasses periods of both back-arc extension (at ~ 300–280 Ma) and subsequent contractional deformation (Hunter–Bowen Orogeny) that commenced at ~ 270 Ma along the paleo-Pacific and Gondwanan subduction plate boundary. We present new paleomagnetic data from volcanic rocks that were extruded during the transition from extension to contraction (at ~ 272 Ma), and we show that the oroclinal structure must have formed prior to the emplacement of the volcanic rocks. Our results thus indicate that oroclinal bending in the southernmost New England Orogen has been completed prior to the onset of Middle Permian contractional deformation. It is therefore concluded that the oroclines have likely formed during back-arc extension, and that a major contribution to the orogenic curvature was driven by trench retreat.
Keyword Oroclinal bending
Subduction rollback
Back-arc extension
New England Orogen
Paleomagnetism
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Publications
Official 2016 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 7 times in Thomson Reuters Web of Science Article | Citations
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Created: Thu, 01 Oct 2015, 18:31:23 EST by Dr Gideon Rosenbaum on behalf of School of Earth Sciences