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    Incremental pluton emplacement during inclined transpression

    Access Status
    Fulltext not available
    Authors
    Zibra, I.
    Smithies, R.
    Wingate, M.
    Kirkland, Chris
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Zibra, I. and Smithies, R. and Wingate, M. and Kirkland, C. 2014. Incremental pluton emplacement during inclined transpression. Tectonophysics. 623: pp. 100-122.
    Source Title
    Tectonophysics
    DOI
    10.1016/j.tecto.2014.03.020
    ISSN
    0040-1951
    URI
    http://hdl.handle.net/20.500.11937/36535
    Collection
    • Curtin Research Publications
    Abstract

    Multidisciplinary investigations suggest that many igneous plutons were assembled incrementally, through emplacement of discrete magma batches. Internal pluton contacts between different units can be remarkably cryptic and/or complex in nature. This presents a major challenge in understanding both how repeated intrusions were emplaced relative to each other, and in their relationships with regional deformation.Here we present the results of a multidisciplinary study from a Neoarchean pluton exposed in the Yilgarn Craton of Western Australia. Our new structural, geophysical, geochemical and geochronology datasets indicate that the pluton was emplaced incrementally along an active, inclined transpressional shear zone. Structural relationships indicate that magmatic to high-temperature solid-state fabrics locally postdate a mid- to upper-greenschist tectonic fabric in an adjacent older unit. We consider these relationships as diagnostic of incremental emplacement, indicating that the shearzone recorded several cycles of strain softening and hardening, in relation to the syntectonic emplacement of discrete magma pulses, followed by syndeformational cooling down to upper-greenschist facies conditions. Our data also suggest that pluton growth occurred through over-accretion of progressively more evolved magma pulses.

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