The contorted New England Orogen (eastern Australia): New evidence from U-Pb geochronology of early Permian granitoids

Rosenbaum, Gideon, Li, Pengfei and Rubatto, Daniela (2012) The contorted New England Orogen (eastern Australia): New evidence from U-Pb geochronology of early Permian granitoids. Tectonics, 31 1: TC1006.1-TC1006.14. doi:10.1029/2011TC002960

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Author Rosenbaum, Gideon
Li, Pengfei
Rubatto, Daniela
Title The contorted New England Orogen (eastern Australia): New evidence from U-Pb geochronology of early Permian granitoids
Journal name Tectonics   Check publisher's open access policy
ISSN 0278-7407
Publication date 2012-02-01
Year available 2012
Sub-type Article (original research)
DOI 10.1029/2011TC002960
Open Access Status File (Publisher version)
Volume 31
Issue 1
Start page TC1006.1
End page TC1006.14
Total pages 14
Place of publication Washington, DC, U.S.A.
Publisher American Geophysical Union
Language eng
Formatted abstract
A series of sharp bends (oroclines) are recognized in the Paleozoic to early Mesozoic New England Orogen of eastern Australia. The exact geometry and origin of these bends is obscured by voluminous magmatism and is still debated. Here we present zircon U-Pb ages that confirm the lateral continuation of early Permian (296–288 Ma) granitoids and shed new light on the oroclinal structure. Orogenic curvature is defined by the alignment of early Permian granitoids parallel to the structural grain of the orogen, as well as the curved geometry of sub-vertical deformation fabrics, forearc basin terranes, and serpentinite outcrops. Alternative geometrical interpretations may involve two bends (Texas and Coffs Harbour Oroclines), three bends (+Manning Orocline), or even four bends (+Nambucca Orocline). We argue that the model involving four bends is most consistent with available data, although further kinematic constraints are required to confirm the existence of the Manning and Nambucca Oroclines. A subsequent phase of younger magmatism (<260 Ma) cuts across the curved structural grain, providing a minimum age constraint for orocline development. Assuming a structure of four oroclines, we suggest a tentative tectonic model that involves an early stage of subduction curvature during slab rollback at 300–285 Ma, followed by bending associated with dextral transpression. A final tightening of the curved structures was possibly obtained by E-W shortening during the late Permian to Triassic (265–230 Ma) Hunter-Bowen orogeny.
Keyword New-south-wales
Coffs harbor block
Fold belt
Subduction complex
Volcanic arc
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
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