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    A test of the viability of fluid-wall rock interaction mechanisms for changes in opaque phase assemblage in metasedimentary rocks in the Kambalda-St. Ives goldfield, Western Australia

    135020_135020.pdf (161.3Kb)
    Access Status
    Open access
    Authors
    Evans, Katy
    Date
    2009
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Evans, Katy. 2009. A test of the viability of fluid-wall rock interaction mechanisms for changes in opaque phase assemblage in metasedimentary rocks in the Kambalda-St. Ives goldfield, Western Australia. Mineralium Deposita. 45 (2): pp. 207-213.
    Source Title
    Mineralium Deposita
    DOI
    10.1007/s00126-009-0260-4
    ISSN
    00264598
    Faculty
    Department of Applied Geology
    Faculty of Science and Engineering
    WA School of Mines
    Remarks

    The original publication is available at : www.springerlink.com

    URI
    http://hdl.handle.net/20.500.11937/36597
    Collection
    • Curtin Research Publications
    Abstract

    Transitions from pyrrhotite-magnetite- to pyrite-magnetite- and pyrite-hematite-bearing assemblages in metasedimentary rocks in the Kambalda-St Ives goldfield have been shown to be spatially associated with economic gold grades. Fluid mixing, fluid-rock interaction and phase separation have been proposed previously as causes for this association. Textural, mineralogical and isotopic evidence is reviewed, and thermodynamic calculations are used to investigate the mineralogical consequences of progressive fluid-rock interaction in interflow metasediments. Fluid-rock interactions in response to fluid infiltration and/or bulk composition variation are plausible mechanisms for production of the observed features.

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