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

    21363_8647_Dutch etal revised AJES submission.pdf (2.764Mb)
    Access Status
    Open access
    Authors
    Dutch, R.
    Hand, M.
    Kinny, Peter
    Date
    2008
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Dutch, Rian and Hand, Martin and Kinny, Peter. 2008. High-grade Paleoproterozoic reworking in the southeastern Gawler Craton, South Australia. Australian Journal of Earth Sciences 55: 1063-1081.
    Source Title
    Australian Journal of Earth Sciences
    DOI
    10.1080/08120090802266550
    ISSN
    0812-0099
    Faculty
    Department of Applied Geology
    Science and Engineering
    Remarks

    This is an Author's Accepted Manuscript of an article published in the Australian Journal of Earth Sciences (30 Apr 2009), copyright Taylor & Francis, available online at: <a href="http://www.tandfonline.com/doi/abs/10.1080/08120090802266550">http://www.tandfonline.com/doi/abs/10.1080/08120090802266550</a>

    URI
    http://hdl.handle.net/20.500.11937/34784
    Collection
    • Curtin Research Publications
    Abstract

    SHRIMP 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.

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