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    Mass transfer and trace element redistribution during hydration of granulites in the Bergen Arcs, Norway

    Access Status
    Fulltext not available
    Authors
    Centrella, S.
    Austrheim, H.
    Putnis, Andrew
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Centrella, S. and Austrheim, H. and Putnis, A. 2016. Mass transfer and trace element redistribution during hydration of granulites in the Bergen Arcs, Norway. Lithos. 262: pp. 1-10.
    Source Title
    Lithos
    DOI
    10.1016/j.lithos.2016.06.019
    ISSN
    0024-4937
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/34267
    Collection
    • Curtin Research Publications
    Abstract

    The Bergen Arcs, located on the western coast of Norway, are characterized by Precambrian granulite facies rocks partially hydrated at amphibolite and eclogite facies conditions. At Hilland Radöy, granulite displays sharp hydration fronts across which the granulite facies assemblage composed of garnet (55%) and clinopyroxene (45%) is replaced by an amphibolite facies mineralogy defined by chlorite, epidote, and amphibole. The replacement of both phases is pseudomorphic and the overall reaction is isovolumetric. In the present study, LA ICPMS has been used to determine the trace element redistribution during the hydration. Although the bulk concentrations of the trace elements do not change, the LILE, HFSE, and REE losses and gains in replacing the garnet are qualitatively balanced by the opposite gains and losses associated with the replacement of clinopyroxene. From the REE compositions of the parent granulite and the product amphibolite, measured in µg/cm3, we conclude that the mass of rock lost to the fluid phase during the hydration is approximately 20%. This suggests a mechanism for coupling between the local stress generated by hydration reactions and mass transfer, dependent on the spatial scale over which the system is open.

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