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    Constraints on the timing and conditions of high-grade metamorphism, charnockite formation and fluid-rock interaction in the Trivandrum Block, southern India

    241140_241140.pdf (3.876Mb)
    Access Status
    Open access
    Authors
    Blereau, E.
    Clark, Christopher
    Taylor, Richard
    Johnson, Tim
    Fitzsimons, Ian
    Santosh, M.
    Date
    2016
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Blereau, E. and Clark, C. and Taylor, R. and Johnson, T. and Fitzsimons, I. and Santosh, M. 2016. Constraints on the timing and conditions of high-grade metamorphism, charnockite formation and fluid-rock interaction in the Trivandrum Block, southern India. Journal of Metamorphic Geology. 34 (6): pp. 527-549.
    Source Title
    Journal of Metamorphic Geology
    DOI
    10.1111/jmg.12192
    ISSN
    0263-4929
    School
    Department of Applied Geology
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP150102773
    Remarks

    This is the peer reviewed version of the following article: Blereau, E. and Clark, C. and Taylor, R. and Johnson, T. and Fitzsimons, I. and Santosh, M. 2016. Constraints on the timing and conditions of high-grade metamorphism, charnockite formation and fluid-rock interaction in the Trivandrum Block, southern India. Journal of Metamorphic Geology. 34 (6): pp. 527-549, which has been published in final form at http://doi.org/10.1111/jmg.12192. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving at http://olabout.wiley.com/WileyCDA/Section/id-820227.html#terms

    URI
    http://hdl.handle.net/20.500.11937/47078
    Collection
    • Curtin Research Publications
    Abstract

    Incipient charnockites have been widely used as evidence for the infiltration of CO2-rich fluids driving dehydration of the lower crust. Rocks exposed at Kakkod quarry in the Trivandrum Block of southern India allow for a thorough investigation of the metamorphic evolution by preserving not only orthopyroxene-bearing charnockite patches in a host garnet-biotite felsic gneiss, but also layers of garnet-sillimanite metapelite gneiss. Thermodynamic phase equilibria modelling of all three bulk compositions indicates consistent peak-metamorphic conditions of 830-925 °C and 6-9 kbar with retrograde evolution involving suprasolidus decompression at high temperature. These models suggest that orthopyroxene was most likely stabilized close to the metamorphic peak as a result of small compositional heterogeneities in the host garnet-biotite gneiss. There is insufficient evidence to determine whether the heterogeneities were inherited from the protolith or introduced during syn-metamorphic fluid flow. U-Pb geochronology of monazite and zircon from all three rock types constrains the peak of metamorphism and orthopyroxene growth to have occurred between the onset of high-grade metamorphism at c. 590 Ma and the onset of melt crystallization at c. 540 Ma. The majority of metamorphic zircon growth occurred during protracted melt crystallization between c. 540 and 510 Ma. Melt crystallization was followed by the influx of aqueous, alkali-rich fluids likely derived from melts crystallizing at depth. This late fluid flow led to retrogression of orthopyroxene, the observed outcrop pattern and to the textural and isotopic modification of monazite grains at c. 525-490 Ma.

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