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    Proterozoic reworking of Archean (Yilgarn) basement in the Bunger Hills, East Antarctica

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    Authors
    Tucker, N.
    Payne, J.
    Clark, Christopher
    Hand, M.
    Taylor, Richard
    Kylander-Clark, A.
    Martin, L.
    Date
    2017
    Type
    Journal Article
    
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    Citation
    Tucker, N. and Payne, J. and Clark, C. and Hand, M. and Taylor, R. and Kylander-Clark, A. and Martin, L. 2017. Proterozoic reworking of Archean (Yilgarn) basement in the Bunger Hills, East Antarctica. Precambrian Research. 298: pp. 16-38.
    Source Title
    Precambrian Research
    DOI
    10.1016/j.precamres.2017.05.013
    ISSN
    0301-9268
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/54464
    Collection
    • Curtin Research Publications
    Abstract

    The Bunger Hills in East Antarctica occupy a pivotal location as the westernmost continuation of the Albany–Fraser Orogen in southwestern Australia. Combined U–Pb, Lu–Hf and oxygen isotope data from the Bunger Hills reveal a previously unrecognised Archean basement (ca. 2800–2700 Ma) of Yilgarn Craton affinity. Results also reveal a Paleo–Mesoproterozoic (ca. 1700–1500 Ma) volcano-clastic sequence and late Mesoproterozoic magmatic intrusives (ca. 1260 Ma and 1200 Ma) that were coeval with high grade metamorphism. Isotopic data reflect the influence of an Archean crustal component in Proterozoic magmatism. Paleoproterozoic magmatism was characterised by voluminous juvenile input and minor recycling of Archean crust. In contrast, Mesoproterozoic magmatism is isotopically evolved, and is interpreted to have been derived largely from reworking of the Paleoproterozoic crust and Archean basement. Strong parallels between the age and isotopic composition of igneous rocks over time from the Bunger Hills and Albany–Fraser Orogen in southwest Australia suggest that the Paleo–Mesoproterozoic tectonic evolution of these two elements of the orogen is linked. Specifically, the Bunger Hills are interpreted to represent the Paleo–Mesoproterozoic (para)autochthonous modification of a reworked fragment of the Archean Yilgarn Craton that was extended during the late Paleoproterozoic.

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