Neoproterozoic glacial events in the Kimberley Region, Western Australia : sedimentology and regional correlation in the context of continental- and global-scale Neoproterozoic glaciation

Maree Corkeron

    Research output: ThesisDoctoral Thesis

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    Abstract

    [Truncated] Glacigenic strata of Neoproterozoic age were identified in the Kimberley region of northwestern Australia in the 1950s. Subsequent mapping of the region identified three areas of distribution; the Mt House, Mt Ramsay and east Kimberley areas. Two glacial events were identified from the Mt Ramsay succession, with one glaciation each from the Mt House and east Kimberley areas. Early workers correlated the older glacial unit in the Mt Ramsay area, the Landrigan Tillite, with the Walsh and Fargoo/Moonlight Valley Tillites of the Mt House and east Kimberley areas, respectively. The Egan Formation in the Mt Ramsay succession was interpreted as recording a younger glacial event. The two glaciations identified from the Kimberley successions were correlated with the Sturtian and Marinoan glaciations of central and southern Australia. Subsequent workers proposed alternative correlations, resulting in conflicting local and regional interpretations of relative ages of the glacigenic strata within a global context. This study sought to resolve the local Kimberley correlation using integration of facies analysis, chemostratigraphy, biostratigraphy, provenance analysis and palaeoice-flow interpretations. A lithofacies association of massive diamictite, conglomerate and sandstone (~10s to 100s of metres thick) characterises the Walsh, Landrigan and Fargoo/Moonlight Valley Tillites. A widely distributed 'cap dolomicrite' lithofacies association of thinly laminated buff dolomicrite (~3 m thick) overlying deformed and brecciated dolomicrite (0.5 m thick) directly overlies all three diamictite/conglomerate units. The cap dolomicrites are interpreted as deep water hemipelagic and turbidite deposits.
    Original languageEnglish
    QualificationDoctor of Philosophy
    Awarding Institution
    • The University of Western Australia
    DOIs
    Publication statusUnpublished - 2002

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