High-grade Paleoproterozoic reworking in the southeastern Gawler Craton, South Australia

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dc.contributor.authorDutch, R.
dc.contributor.authorHand, M.
dc.contributor.authorKinny, P.
dc.date.issued2008
dc.description.abstractSHRIMP U-Pb geochronology and monazite EPMA chemical dating from the southeast Gawler Craton has constrained the timing of high-grade reworking of the Early Paleoproterozoic (ca 2450 Ma) Sleaford Complex during the Paleoproterozoic Kimban Orogeny. SHRIMP monazite geochronology from mylonitic and migmatitic high-strain zones that deform the ca 2450 Ma peraluminous granites indicates that they formed at 1725 ± 2 and 1721 ± 3 Ma. These are within error of EPMA monazite chemical ages of the same high-strain zones which range between 1736 and 1691 Ma. SHRIMP dating of titanite from peak metamorphic (1000 MPa at 730°C) mafic assemblages gives ages of 1712 ± 8 and 1708 ± 12 Ma. The post-peak evolution is constrained by partial to complete replacement of garnet-clinopyroxene-bearing mafic assemblages by hornblende-plagioclase symplectites, which record conditions of ∼ 600 MPa at 700°C, implying a steeply decompressional exhumation path. The timing of Paleoproterozoic reworking corresponds to widespread deformation along the eastern margin of the Gawler Craton and the development of the Kalinjala Shear Zone.
dc.description.statementofresponsibilityR. Dutch, M. Hand, P. D. Kinny
dc.identifier.citationAustralian Journal of Earth Sciences, 2008; 55(8):1063-1081
dc.identifier.doi10.1080/08120090802266550
dc.identifier.issn0812-0099
dc.identifier.issn1440-0952
dc.identifier.orcidHand, M. [0000-0003-3743-9706]
dc.identifier.urihttp://hdl.handle.net/2440/52155
dc.language.isoen
dc.publisherTaylor & Francis
dc.relation.granthttp://purl.org/au-research/grants/arc/LP0454301
dc.rights© 2008 Geological Society of Australia
dc.source.urihttps://doi.org/10.1080/08120090802266550
dc.subjectEPMA
dc.subjectGawler Craton
dc.subjectKimban Orogen
dc.subjectmonazite
dc.subjectreworking
dc.subjectSHRIMP
dc.titleHigh-grade Paleoproterozoic reworking in the southeastern Gawler Craton, South Australia
dc.typeJournal article
pubs.publication-statusPublished

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