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    On the hydration of olivine in ultramafic rocks: Implications from Fe isotopes in serpentinites

    Access Status
    Fulltext not available
    Authors
    Scott, S.
    Sims, K.
    Frost, B.
    Kelemen, P.
    Evans, Katy
    Swapp, S.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Scott, S. and Sims, K. and Frost, B. and Kelemen, P. and Evans, K. and Swapp, S. 2017. On the hydration of olivine in ultramafic rocks: Implications from Fe isotopes in serpentinites. Geochimica Et Cosmochimica Acta. 215: pp. 105-121.
    Source Title
    Geochimica Et Cosmochimica Acta
    DOI
    10.1016/j.gca.2017.07.011
    ISSN
    0016-7037
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/56321
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 The behavior of Fe during serpentinization largely controls the potential for oxidation-reduction reactions and energy budget for serpentinite-hosted microbial communities. We present Fe isotope data for mineral separates from a partially serpentinized dunite from New Caledonia to understand the behavior of Fe during serpentinization processes. Our new Fe isotope data in mineral separates is compared to existing data from whole rock studies of serpentinites, which have generally concluded that Fe mobility during serpentinization is restricted to the highest temperatures of serpentinization in subduction zones. Measurements of mineral separates from New Caledonia show significant Fe isotope fractionations, with serpentine-brucite mixtures having the lowest d 56 Fe ~ -0.35‰ and magnetite having the highest d 56 Fe ~ +0.75‰. Olivine, orthopyroxene, and the whole rock composition are all within error of d 56 Fe = 0.00‰. Fe isotope thermometry between mineral phases reveals two distinct temperatures of equilibration, one for the mantle olivine and pyroxene (~1325 °C), and a second, much lower temperature (~335 °C) for the serpentinite assemblage. The combined isotopic, mineralogical and geochemical data indicate that during the magnetite-forming stage of serpentinization, a pore fluid in equilibrium with the mineralogical assemblage evolves to higher Fe concentrations as serpentinization proceeds. When this pore fluid is removed from the serpentinizing environment, the total abundance of Fe removed from the rock in the pore fluid is much less than the bulk rock Fe and has a minimal effect on the overall rock composition.

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