Radiogenic heat production drives Cambrian–Ordovician metamorphism of the Curnamona Province, south-Central Australia: Insights from petrochronology and thermal modelling

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dc.contributor.authorDe Vries Van Leeuwen, A.T.
dc.contributor.authorRaimondo, T.
dc.contributor.authorMorrissey, L.J.
dc.contributor.authorHand, M.
dc.contributor.authorHasterok, D.
dc.contributor.authorClark, C.
dc.contributor.authorAnczkiewicz, R.
dc.date.issued2023
dc.description.abstractMulti-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.
dc.description.statementofresponsibilityAlexander T. De Vries Van Leeuwen, Tom Raimondo, Laura J. Morrissey Martin Hand, Derrick Hasterok, Chris Clark, Robert Anczkiewicz
dc.identifier.citationLithos, 2023; 446-447:107137-1-107137-18
dc.identifier.doi10.1016/j.lithos.2023.107137
dc.identifier.issn0024-4937
dc.identifier.issn1872-6143
dc.identifier.orcidDe Vries Van Leeuwen, A.T. [0000-0003-4988-4153]
dc.identifier.orcidRaimondo, T. [0000-0001-9115-9196]
dc.identifier.orcidMorrissey, L.J. [0000-0001-7506-6117]
dc.identifier.orcidHand, M. [0000-0003-3743-9706]
dc.identifier.orcidHasterok, D. [0000-0002-8257-7975]
dc.identifier.urihttps://hdl.handle.net/2440/140357
dc.language.isoen
dc.publisherElsevier BV
dc.relation.granthttp://purl.org/au-research/grants/arc/DP160103449
dc.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/).
dc.source.urihttps://doi.org/10.1016/j.lithos.2023.107137
dc.subjectCurnamona Province; Metamorphism; Petrochronology; Radiogenic Heat Production; Thermal Modelling
dc.titleRadiogenic heat production drives Cambrian–Ordovician metamorphism of the Curnamona Province, south-Central Australia: Insights from petrochronology and thermal modelling
dc.typeJournal article
pubs.publication-statusPublished

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