The geochemistry of Jurassic dolerites from Portal Peak, Antarctica

Janet M. Hergt*, Bruce W. Chappell, Gunter Faure, Teresa M. Mensing

*Corresponding author for this work

    Research output: Contribution to journalArticle

    57 Citations (Scopus)

    Abstract

    Geochemical and isotopic analyses have been performed on a suite of samples from a Jurassic quartz tholeiite sill of the Ferrar Group at Portal Peak, Queen Alexandra Range, near the Beardmore Glacier in Antarctica. The data include major and trace element (XRF and INAA) concentrations, as well as Sr and Nd isotopic compositions, and are combined with the results of other studies on samples from Antarctica. It is demonstrated that despite differences in the pre-intrusion (or eruption) evolution of the Ferrar Group magmas, the similarity in isotopic and chemical compositions for these rocks supports the existence of a remarkably uniform mantle source with unusual signature over a distance of thousands of kilometres. The favoured origin of this source involves the subduction of terrestrial sedimentary material into a depleted mantle reservoir.

    Original languageEnglish
    Pages (from-to)298-305
    Number of pages8
    JournalContributions to Mineralogy and Petrology
    Volume102
    Issue number3
    DOIs
    Publication statusPublished - Jul 1989

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