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    Organizing melt flow through the crust

    Access Status
    Fulltext not available
    Authors
    Brown, M.
    Korhonen, Fawna
    Siddoway, C.
    Date
    2011
    Type
    Journal Article
    
    Metadata
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    Citation
    Brown, Michael and Korhonen, Fawna J. and Siddoway, Christine S. 2011. Organizing melt flow through the crust. Elements: An international magazine of mineralogy, geochemistry, and petrology. 7 (4): pp. 261-266.
    Source Title
    Elements: an international magazine of mineralogy, geochemistry, and petrology
    DOI
    10.2113/gselements.7.4.261
    ISSN
    1811-5209
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/47594
    Collection
    • Curtin Research Publications
    Abstract

    Melt that crystallizes as granite at shallow crustal levels in orogenic belts originates from migmatite and residual granulite in the deep crust; this is the most important mass-transfer process affecting the continents. Initially melt collects in grain boundaries before migrating along structural fabrics and through discordant fractures initiated during synanatectic deformation. As this permeable porosity develops, melt flows down gradients in pressure generated by the imposed tectonic stress, moving from grain boundaries through outcrop-scale vein networks to ascent conduits. Gravity then drives melt ascent through the crust, either in dikes that fill ductile-to-brittle-elastic fractures or by pervasive flow in planar and linear channels in belts of steep structural fabrics. Melt may be arrested in its ascent at the ductile-to-brittle transition zone or it may be trapped en route by a developing tectonic structure.

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