Constraining timing of brittle deformation and fault gouge formation in the Sydney Basin

D.J. Och, R. Offler, Horst Zwingmann

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    Structural and K-Ar dating studies of gouge in N-S, NNE and E-W-trending faults in four locations in the Sydney-Hunter region are reported. The fault zones are manifest as joint swarms and highly brecciated zones containing gouge with authigenic illite produced as a result of fluid infiltration. Strike-slip movement accompanied by minor dip-slip, normal movement occurred on the NNE faults, with dip slip on N-S and E-W-trending faults. In this study, gouge from a NE-trending, steep, SE-dipping fault showing dip-slip movement at Cut 10, on the Hunter Expressway and from an E-W-trending, steep south-dipping, normal fault at the Westside Open Cut, Lake Macquarie have been analysed. K-Ar dating of illite and illite-smectite in fractions extracted from fault gouges in areas unaffected by a thermal overprint reveals ages varying from 166 to 119 Ma for the
    Original languageEnglish
    Pages (from-to)337-350
    JournalAustralian Journal of Earth Sciences
    Volume61
    Issue number3
    DOIs
    Publication statusPublished - 2014

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