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https://hdl.handle.net/2440/140357
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Type: | Journal article |
Title: | Radiogenic heat production drives Cambrian–Ordovician metamorphism of the Curnamona Province, south-Central Australia: Insights from petrochronology and thermal modelling |
Author: | De Vries Van Leeuwen, A.T. Raimondo, T. Morrissey, L.J. Hand, M. Hasterok, D. Clark, C. Anczkiewicz, R. |
Citation: | Lithos, 2023; 446-447:107137-1-107137-18 |
Publisher: | Elsevier BV |
Issue Date: | 2023 |
ISSN: | 0024-4937 1872-6143 |
Statement of Responsibility: | Alexander T. De Vries Van Leeuwen, Tom Raimondo, Laura J. Morrissey Martin Hand, Derrick Hasterok, Chris Clark, Robert Anczkiewicz |
Abstract: | Multi-mineral petrochronology can effectively track changes in the thermochemical environment experienced by rocks during metamorphism. We demonstrate this concept using garnet–chlorite schists from the Walter-Outalpa Shear Zone of the southern Curnamona Province, South Australia, which reveal a cryptic and protracted (c. 39 Myr) record of high thermal gradient metamorphism. Petrochronological data including in situ monazite U–Pb and garnet Lu–Hf and Sm–Nd dating suggest elevated geotherms were persistent between at least c. 519–480 Ma, throughout the duration of garnet growth. Additional in situ xenotime U–Pb dating implies that partial garnet breakdown occurred between c. 480–440 Ma, likely induced by fluid-rock interaction or exhumation. Although metamorphism temporally overlaps with the timing of the regional Delamerian Orogeny (c. 520–480 Ma), the thermal mechanism to sustain elevated temperatures has remained enigmatic. One-dimensional thermal models are used to appraise the role of radiogenic heat production in driving the observed high thermal gradient metamorphism. The models reveal that with only modest crustal thickening during orogenesis, the endogenous radiogenic heat production hosted within the basement rocks could plausibly provide the thermal impetus for metamorphism. |
Keywords: | Curnamona Province; Metamorphism; Petrochronology; Radiogenic Heat Production; Thermal Modelling |
Rights: | © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
DOI: | 10.1016/j.lithos.2023.107137 |
Grant ID: | http://purl.org/au-research/grants/arc/DP160103449 |
Published version: | http://dx.doi.org/10.1016/j.lithos.2023.107137 |
Appears in Collections: | Earth and Environmental Sciences publications |
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hdl_140357.pdf | Published version | 17.9 MB | Adobe PDF | View/Open |
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