England batholith, NSW, Australia

age implications for the crust

S. E. Shaw, R. H. Flood

    Research output: Contribution to journalMeeting abstract

    Abstract

    Heading
    Zircon Lu-Hf istopic data for representative plutons from the
    five granite suites of the New England Batholith indicates a significant
    Late Proterozoic lower crustal input for all except one of the
    suites. Earlier published oxygen (O’Neil et al.) and recently published
    Li isotopic data (Bryant et al., 2004) support the view that
    the two Permo-Carboniferous suites (Bundarra and Hillgrove) are
    S-type but with 87Sr/86Sr ratios that are lower than those of
    Lachlan Fold Belt S-types and that of the three Permo-Triassic
    metaluminous suites, one, the Clarence River, is an isotopically
    primitive I-type, one, the Moonbi, is a more evolved I-type and
    the third, the Uralla, has isotopic and mineralogical characteristics
    transitional between I-type and S-type.
    New 176Hf/Hf177 data from single zircon grains obtained using
    the methods and elegant correction procedures in Griffin et al.
    (2000) show that only the Clarence River suite has TDM model
    ages close to the emplacement ages. Zircon data for the other four
    suites suggests the crustal component underlying of the New England
    Batholith could be as old as Late Proterozoic. The data are
    consistent with the initiation of the Tasman Fold Belt System, of
    which New England is part, around 830 and 730 Ma.

    References
    Bryant, C.J., Chappell, B.W., Bennett, V.C., McCulloch, M.T., 2004.
    Trans. Roy. Soc. Edin. 95, 199–214.
    Griffin, W.L., Xiang Wang, Jackson, S.E., Pearson, N.J., O’Reilly, S.Y.,
    Xisheng Xu, Xinmin Zhou, 2000. Lithos 61, 237–269.
    O’Neil, J., Shaw, S.E., Flood, R.H., Contrib. Mineral Petrol. 62 313–328.
    Original languageEnglish
    Pages (from-to)A578-A578
    Number of pages1
    JournalGeochimica et Cosmochimica Acta
    Volume70
    Issue number18 supplement
    DOIs
    Publication statusPublished - 2006
    EventGoldschmidt Conference (16th : 2006) - Melbourne, Australia
    Duration: 27 Aug 20061 Sep 2006

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