Formation of late sillimanite by hydrogen metasomatism (base-leaching) in some high-grade gneisses

R. H. Vernon*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    63 Citations (Scopus)

    Abstract

    Microstructural evidence indicates that fibrolitic sillimanite partly replaced of the highest-grade metamorphic assemblage in the high-grade metapelitic gneisses, migmatites and granodiorite of the Cooma Complex, southeastern Australia. The sillimanite is interpreted as having formed by the action of mobile hydrogen ions on pre-existing minerals, base cations being released and removed from the sites of reaction. The hydrogen ions may have been liberated during widespread hydration of cordierite. The general base-leaching process may be applicable to the formation of late sillimanite in high-grade, migmatitic gneisses in other areas.

    Original languageEnglish
    Pages (from-to)143-152
    Number of pages10
    JournalLithos
    Volume12
    Issue number2
    DOIs
    Publication statusPublished - 15 Apr 1979

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