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    Massive serpentinite carbonation at Linnajavri, N-Norway

    Access Status
    Fulltext not available
    Authors
    Beinlich, Andreas
    Plümper, O.
    Hövelmann, J.
    Austrheim, H.
    Jamtveit, B.
    Date
    2012
    Type
    Journal Article
    
    Metadata
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    Citation
    Beinlich, A. and Plümper, O. and Hövelmann, J. and Austrheim, H. and Jamtveit, B. 2012. Massive serpentinite carbonation at Linnajavri, N-Norway. Terra Nova. 24 (6): pp. 446-455.
    Source Title
    Terra Nova
    DOI
    10.1111/j.1365-3121.2012.01083.x
    ISSN
    0954-4879
    School
    The Institute for Geoscience Research (TIGeR)
    URI
    http://hdl.handle.net/20.500.11937/47916
    Collection
    • Curtin Research Publications
    Abstract

    Carbonation of ultramafic rocks is being considered as an in situ disposal strategy for anthropogenic CO 2. We present observations from massively carbonated serpentinites at Linnajavri, N-Norway, where serpentinized fragments of the dismembered ophiolite are hydrothermally altered to soapstone and listvenite on a km-scale. Several sharp reaction fronts between the soapstone and the serpentinite can be followed for hundreds of metres. Listvenite is present between the underlying carbonate-mica schist and the soapstone. The O-isotopic compositions of vein minerals in the listvenite and adjacent soapstone indicate an isothermal formation at ~275°C. In agreement with C-isotope signatures, field observations suggest that fluids were derived from overthrusted sediments. Porosimetry data, mass-balance calculations and the perpetuation of serpentinite structures imply an isovolumetric alteration. We conclude that the reactions stopped due to the cessation of the external CO 2 supply. Soapstone formation is associated with sequestration of more than 13 Mt of CO 2. © 2012 Blackwell Publishing Ltd.

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