Compositional changes during fractionation of felsic granites from western Tasmania, Australia

Doone Wyborn, Bruce W. Chappell

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    2 Citations (Scopus)

    Abstract

    Geochemical and Sr isotopic signatures of Late Devonian to Early Carboniferous granites of western Tasmania indicate they were derived from four main source rocks, two metaluminous (I-type Housetop and Meredith Suites) and two peraluminous (S-type Pieman and Interview Suites). All granites are felsic with SiO2 greater than 70%, and show fractionation trends indicating fractionation near the ternary minimum in the Ab-Q-Kf system. The behaviour of trace elements during the fractionation is dependent on the alumina saturation index and oxygen fugacity of the magmas. In the oxidised metaluminous Housetop Suite Rb, Th and Y, and possibly Nb and U are incompatible. The weakly metaluminous Meredith Suite has only Rb, Y and U incompatible. Rb, Nb, Sn and U are incompatible in the weakly peraluminous Pieman Suite, and in the strongly peraluminous Interview Suite P2O5, Rb, Nb, Sn, and U are incompatible.

    Original languageEnglish
    Pages (from-to)189-193
    Number of pages5
    JournalActa Universitatis Carolinae, Geologica
    Volume42
    Issue number1
    Publication statusPublished - 1998

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