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    Pb isotopic domains from the Indian Ocean sector of Antarctica: implications for past Antarctica–India connections

    193916_193916.pdf (742.4Kb)
    Access Status
    Open access
    Authors
    Flowerdew, M.
    Tyrrell, S.
    Boger, S.
    Fitzsimons, Ian
    Harley, S.
    Mikhalsky, E.
    Vaughan, A.
    Date
    2013
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Flowerdew, M.J. and Tyrrell, S. and Boger, S.D. and Fitzsimons, I.C.W. and Harley, S.L. and Mikhalsky, E.V. and Vaughan, A.P.M. 2013. Pb isotopic domains from the Indian Ocean sector of Antarctica: implications for past Antarctica–India connections. Geological Society Special Publications. 383: pp. 59-72.
    Source Title
    Geological Society Special Publication
    DOI
    10.1144/SP383.3
    ISSN
    0305-8719
    Remarks

    Supplementary material: Feldspar LA-ICP-MS Pb isotope data are available at www.geolsoc.org.uk/SUP18622

    URI
    http://hdl.handle.net/20.500.11937/33228
    Collection
    • Curtin Research Publications
    Abstract

    New feldspar lead isotope compositions of crystalline rocks from the Indian Ocean sector of East Antarctica, in conjunction with the review of data from elsewhere within the continent and from continents formerly adjacent within Gondwana, refine boundaries and evolutionary histories of terranes previously inferred from geological mapping and complementary isotope studies. Coastal Archaean Vestfold and Napier complexes have overlapping compositions and had Pb isotopes homogenized at 2.5 Ga sourced from or within already fractionated protoliths with high and variable U–Pb. Identical compositions from the Dharwar Craton of India support a correlation with these Antarctic terranes. The Proterozoic–Palaeozoic Rayner Complex and Prydz Belt yield more radiogenic compositions and are broadly similar and strongly suggest these units correlate with parts of the Eastern Ghats Belt of India. A strikingly different signature is evident from the inboard Ruker Complex, which yielded unradiogenic compositions. This complex is unlike any unit within India or Australia, suggesting that these rocks represent exposures of an Antarctic (Crohn) Craton. Compositions from the enigmatic Rauer Terrane are consistent with a shared early history with the Ruker Complex but with a different post-Archaean evolution.

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