Optical microstructure of partly recrystallized calcite in some naturally deformed marbles

R. H. Vernon*

*Corresponding author for this work

    Research output: Contribution to journalArticle

    45 Citations (Scopus)

    Abstract

    Deformed marbles from the Mt. Lofty Ranges, South Australia, have microstructures characterized by deformed relics of calcite interspersed with much finer-grained, recrystallized calcite, and with minor quartz and diopside. The deformed calcite relics contain numerous subgrains, and show abundant evidence of strain-induced migration of twin and grain boundaries. New calcite grains have nucleated and grown preferentially along twins (especially at twin intersections), at grain and kink-like boundaries, and apparently randomly inside-deformed relics. Optical microstructural evidence suggests that dynamic (syntectonic) recrystallization has taken place, along with some static recrystallization. Probable mechanisms for the initiation of recrystallization include bulge nucleation and subgrain nucleation.

    Original languageEnglish
    Pages (from-to)601-612
    Number of pages12
    JournalTectonophysics
    Volume78
    Issue number1-4
    DOIs
    Publication statusPublished - 1 Oct 1981

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