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    The mechanism of cation and oxygen isotope exchange in alkali feldspars under hydrothermal conditions

    Access Status
    Fulltext not available
    Authors
    Niedermeier, D.
    Putnis, Andrew
    Geisler, T.
    Golla-Schindler, U.
    Putnis, Christine
    Date
    2009
    Type
    Journal Article
    
    Metadata
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    Citation
    Niedermeier, D. and Putnis, A. and Geisler, T. and Golla-Schindler, U. and Putnis, C. 2009. The mechanism of cation and oxygen isotope exchange in alkali feldspars under hydrothermal conditions. Contributions to Mineralogy and Petrology. 157 (1): pp. 65-76.
    Source Title
    Contributions to Mineralogy and Petrology
    DOI
    10.1007/s00410-008-0320-2
    ISSN
    0010-7999
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/44338
    Collection
    • Curtin Research Publications
    Abstract

    The mechanism of re-equilibration of albite in a hydrothermal fluid has been investigated experimentally using natural albite crystals in an aqueous KCl solution enriched in 18O at 600°C and 2 kbars pressure. The reaction is pseudomorphic and produces a rim of K-feldspar with a sharp interface on a nanoscale which moves into the parent albite with increasing reaction time. Transmission electron microscopy (TEM) diffraction contrast and X-ray powder diffraction (XRD) show that the K-feldspar has a very high defect concentration and a disordered Al, Si distribution, compared to the parent albite. Raman spectroscopy shows a frequency shift of the Si-O-Si bending vibration from ~476 cm-1 in K-feldspar formed in normal 16O aqueous solution to ~457 cm-1 in the K-feldspar formed in 18O-enriched solution, reflecting a mass-related frequency shift due to a high enrichment of 18O in the K-feldspar silicate framework. Raman mapping of the spatial distribution of the frequency shift, and hence 18O content, compared with major element distribution maps, show a 1:1 correspondence between the reaction rim formed by the replacement of albite by K-feldspar, and the oxygen isotope re-equilibration. The textural and chemical characteristics as well as the kinetics of the replacement of albite by K-feldspar are consistent with an interface-coupled dissolution-reprecipitation mechanism. © Springer-Verlag 2008.

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