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https://hdl.handle.net/2440/77741
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Type: | Journal article |
Title: | Duration of high-pressure metamorphism and cooling during the intraplate Petermann Orogeny |
Author: | Walsh, A. Raimondo, T. Kelsey, D. Hand, M. Pfitzner, H. Clark, C. |
Citation: | Gondwana Research, 2012; Online(3-4):1-15 |
Publisher: | Int Assoc Gondwana Research |
Issue Date: | 2012 |
ISSN: | 1342-937X 1878-0571 |
Statement of Responsibility: | A.K. Walsh, T. Raimondo, D.E. Kelsey, M. Hand, H.L. Pfitzner, C. Clark |
Abstract: | The Ediacaran-Cambrian Petermann Orogeny, central Australia, is an exceptional example of intraplate orogenesis. It involved sub-eclogite facies metamorphism and extreme basin inversion during the exhumation of Musgrave Province basement from beneath the formerly contiguous Centralian Superbasin. Sensitive High Resolution Ion Microprobe (SHRIMP) U-Pb geochronology of zircon, titanite and rutile, along with Ti-in-zircon thermometry from meta-igneous samples, have been used to determine the timing and duration of high-pressure metamorphism and subsequent cooling associated with this orogenic event. Peak metamorphic temperatures of 720-760°C were attained at 544±7Ma (U-Pb zircon). Subsequent cooling to 600-660°C by ~521Ma occurred at a rate of ~2.6-7.0°CMyr-1, as recorded by the closure of Pb diffusion in titanite. Further cooling to 585-560°C by 498-472Ma occurred at a rate of 0.9-4.8°CMyr-1, as recorded by Pb closure in rutile. The duration of tectonism was long-lived (>40Myr) across the central and western parts of the orogenic system, and deformation occurred in a comparatively warm and weak portion of crust, characterised by regional thermal gradients of 17-26°Ckm-1. This proposed duration of tectonism is much longer than that permitted by a shear heating mechanism, which requires an exceptionally short duration of tectonism, and additionally, an overall cold lithosphere characterised by geothermal gradients of ~9°Ckm-1. © 2012 International Association for Gondwana Research. |
Keywords: | Central Australia Petermann Musgrave Province Intraplate SHRIMP U–Pb geochronology |
Rights: | © 2012 Published by Elsevier B.V. on behalf of International Association for Gondwana Research. |
DOI: | 10.1016/j.gr.2012.09.006 |
Grant ID: | http://purl.org/au-research/grants/arc/LP100200127 http://purl.org/au-research/grants/arc/LP100200127 |
Published version: | http://dx.doi.org/10.1016/j.gr.2012.09.006 |
Appears in Collections: | Aurora harvest 4 Earth and Environmental Sciences publications Environment Institute publications |
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