The tectonic significance of lower Permain successions in the Texas Orocline (Eastern Australia)

Campbell, M., Rosenbaum, G., Shaanan, U., & Allen, C. (2015) The tectonic significance of lower Permain successions in the Texas Orocline (Eastern Australia). Australian Journal of Earth Sciences, 62(7), pp. 789-806.

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The Texas Orocline is a prominent orogenic curvature that developed during the early Permian in the southern New England Orogen. Outliers preserving lower Permian sedimentary successions (Bondonga, Silver Spur, Pikedale, Terrica, Alum Rock and Ashford beds) approximately outline the oroclinal structure, but the tectonic processes responsible for the development of these basinal successions, and their relationships to the Texas Orocline, are unclear. Here we address this shortcoming by providing new U–Pb detrital and primary zircon ages from these successions, as well as detailed stratigraphic and structural data from the largest exposed succession (Bondonga beds). Field observations and U–Pb geochronological data suggest that the lower Permian successions in the Texas Orocline are remnants of a single, formerly larger basin that was deposited after ca 302 Ma. Time constraints for formation of this basin are correlative with constraints from the lower Permian Nambucca Block, which was likely deposited in response to regional back-arc extension during and/or after the development of the Texas Orocline. The conclusion that the lower Permian sedimentary basins in the Texas Orocline belong to this back-arc extensional system supports the suggestion that oroclinal bending in the New England Orogen was primarily controlled by trench retreat and associated overriding-plate extension.

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ID Code: 94083
Item Type: Journal Article
Refereed: Yes
Keywords: New England Orogen, Oroclines, Texas Orocline, Early Permian, U-Pb geochronology, Zircon, Depositional age, Provenance
DOI: 10.1080/08120099.2015.1111259
ISSN: 0812-0099
Divisions: Current > Schools > School of Earth, Environmental & Biological Sciences
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: 2015 Geological Society of Australia
Deposited On: 24 Mar 2016 05:16
Last Modified: 28 Mar 2016 21:19

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