Orocline driven transtensional basins: insights from the Lower Permian Manning Basin (Eastern Australia)

White, Llyam, Rosenbaum, Gideon, Allen, Charlotte M. and Shaanan, Uri (2016) Orocline driven transtensional basins: insights from the Lower Permian Manning Basin (Eastern Australia). Tectonics, 35 3: 690-703. doi:10.1002/2015TC004021


Author White, Llyam
Rosenbaum, Gideon
Allen, Charlotte M.
Shaanan, Uri
Title Orocline driven transtensional basins: insights from the Lower Permian Manning Basin (Eastern Australia)
Journal name Tectonics   Check publisher's open access policy
ISSN 0278-7407
1944-9194
Publication date 2016-02-22
Sub-type Article (original research)
DOI 10.1002/2015TC004021
Volume 35
Issue 3
Start page 690
End page 703
Total pages 38
Place of publication Hoboken, NJ, United States
Publisher Wiley-Blackwell Publishing
Collection year 2017
Language eng
Abstract The New England Orogen in eastern Australia exhibits an oroclinal structure, but its geometry and geodynamic evolution are controversial. Here we present new data from the southernmost part of the oroclinal structure, the Manning Orocline, which supposedly developed in the Early Permian, contemporaneously and/or shortly after the deposition of the Lower Permian Manning Basin. New U-Pb detrital zircon data provide a maximum depositional age of ~288 Ma. Structural evidence from rocks of the Manning Basin indicates that both bedding and pre-oroclinal fold axial planes are approximately oriented parallel to the trace of the Manning Orocline. Brittle deformation was dominated by sinistral strike-slip faulting, particularly along a major fault zone (Peel-Manning Fault System), which is marked by the occurrence of a serpentinitic mélange, and separates tectono-stratigraphic units of the New England Orogen. Our revised geological map shows that the Manning Basin is bounded by faults and serpentinites, thus indicating that basin formation was intimately linked to deformation along the Peel-Manning Fault System. The Manning Basin is thus interpreted to be a transtensional pull-apart basin associated with the Peel-Manning Fault System. Age constraints and structural relationships indicate that basin formation likely occurred during the incipient stage of oroclinal bending, with block rotations and fragmentation of the transtensional pull-apart system occurring subsequently. The intimate link between oroclinal bending and basin formation in the New England oroclines indicates that backarc extension, accompanied by transtensional deformation, could have played an important role in the early stage of orocline development.
Keyword Oroclinal bending
Transtension
Detrital zircon
New England orogen
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Published online 22 February 2016. Accepted manuscript

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Publications
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Created: Tue, 23 Feb 2016, 12:52:56 EST by Dr Gideon Rosenbaum on behalf of School of Earth Sciences