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    The origin of basin-scale syn-extesnional synclines on the southern margin of the Northern Carnarvon Basin

    Access Status
    Fulltext not available
    Authors
    McHarg, S.
    Elders, Chris
    Cunneen, Jane
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    McHarg, S. and Elders, C. and Cunneen, J. 2018. The origin of basin-scale syn-extesnional synclines on the southern margin of the Northern Carnarvon Basin. Journal of the Geological Society of London. 176 (1): pp. 115-128.
    Source Title
    Journal of the Geological Society of London
    DOI
    10.1144/jgs2018-043
    School
    School of Earth and Planetary Sciences (EPS)
    URI
    http://hdl.handle.net/20.500.11937/74643
    Collection
    • Curtin Research Publications
    Abstract

    Fault geometry exerts a dominant structural control on the deformation of hanging wall sequences during extension and contraction. Numerical, kinematic and sandbox modelling studies have demonstrated that characteristic anticline–syncline pairs are produced during the extension of ramp-flat faults. These features are commonly recognized in smaller fault-scale structures, but remain underappreciated in larger, basin-scale settings. The Lewis Trough, situated within the Northern Carnarvon Basin, Western Australia, is a basin-scale, largely unfaulted syncline with an associated anticline along its western flank, rather than the fault-related graben typical of the region. We present kinematic models demonstrating that a SE-dipping, ramp-flat fault geometry can produce relative highs and lows in Jurassic strata as well as honouring the asymmetrical onlap pattern within the Lewis Trough. This study indicates that the Lewis Trough formed during the Early Jurassic, a period typically associated with high rates of extension and not during the Late Triassic Fitzroy Compression Event. This study also highlights the importance of the Locker Shale in partitioning deformation of the Permian and Mesozoic fault systems and as a diffuse zone that variably partitions displacement between stacked Permian and Mesozoic fault systems.

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