Unravelling the geometry of the New England Oroclines (eastern Australia): constraints from magnetic fabrics

Mochales, Tania, Rosenbaum, Gideon, Speranza, Fabio and Pisarevsky, Sergei A. (2014) Unravelling the geometry of the New England Oroclines (eastern Australia): constraints from magnetic fabrics. Tectonics, 33 11: 2261-2282. doi:10.1002/2013TC003483


Author Mochales, Tania
Rosenbaum, Gideon
Speranza, Fabio
Pisarevsky, Sergei A.
Title Unravelling the geometry of the New England Oroclines (eastern Australia): constraints from magnetic fabrics
Journal name Tectonics   Check publisher's open access policy
ISSN 0278-7407
1944-9194
Publication date 2014-11
Year available 2014
Sub-type Article (original research)
DOI 10.1002/2013TC003483
Open Access Status
Volume 33
Issue 11
Start page 2261
End page 2282
Total pages 22
Place of publication Hoboken, NJ United States
Publisher Wiley-Blackwell Publishing
Collection year 2015
Language eng
Formatted abstract
The southern New England Orogen (NEO) in eastern Australia is characterized by tight curvatures (oroclines), but the exact geometry of the oroclines and their kinematic evolution are controversial. Here we present new data on the anisotropy of magnetic susceptibility (AMS), which provide a petrofabric proxy for the finite strain associated with the oroclines. We focus on a series of preoroclinal Devonian-Carboniferous fore-arc basin rocks, which are aligned parallel to the oroclinal structure, and by examining structural domains, we test whether or not the magnetic fabric is consistent with the strain axes. AMS data show a first-order consistency with the shape of the oroclines, characterized, in most of structural domains, by subparallelism between magnetic lineations, “structural axis” and bedding. With the exception of the Gresford and west Hastings domains, our results are relatively consistent with the existence of the Manning and Nambucca (Hastings) Oroclines. Reconstruction of magnetic lineations to a prerotation (i.e., pre–late Carboniferous) stage, considering available paleomagnetic results, yields a consistent and rather rectilinear NE-SW predeformation fore-arc basin. This supports the validity of AMS as a strain proxy in complex orogens, such as the NEO. In the Hastings Block, magnetic lineations are suborthogonal to bedding, possibly indicating a different deformational history with respect to the rest of the NEO.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Publications
Official 2015 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 9 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 8 times in Scopus Article | Citations
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Created: Fri, 17 Oct 2014, 08:05:09 EST by Dr Gideon Rosenbaum on behalf of School of Earth Sciences