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    Multistage growth of Fe–Mg–carpholite and Fe–Mg–chloritoid, from field evidence to thermodynamic modelling

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    Authors
    Pourteau, Amaury
    Bousquet, R.
    Vidal, O.
    Plunder, A.
    Duesterhoeft, E.
    Candan, O.
    Oberhänsli, R.
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Pourteau, A. and Bousquet, R. and Vidal, O. and Plunder, A. and Duesterhoeft, E. and Candan, O. and Oberhänsli, R. 2014. Multistage growth of Fe–Mg–carpholite and Fe–Mg–chloritoid, from field evidence to thermodynamic modelling. Contributions to Mineralogy and Petrology. 168 (6): pp. 1-25.
    Source Title
    Contributions to Mineralogy and Petrology
    DOI
    10.1007/s00410-014-1090-7
    ISSN
    0010-7999
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/22702
    Collection
    • Curtin Research Publications
    Abstract

    © 2014, Springer-Verlag Berlin Heidelberg. We provide new insights into the prograde evolution of HP/LT metasedimentary rocks on the basis of detailed petrologic examination, element-partitioning analysis, and thermodynamic modelling of well-preserved Fe–Mg–carpholite- and Fe–Mg–chloritoid-bearing rocks from the Afyon Zone (Anatolia). We document continuous and discontinuous compositional (ferromagnesian substitution) zoning of carpholite (overall XMg = 0.27–0.73) and chloritoid (overall XMg = 0.07–0.30), as well as clear equilibrium and disequilibrium (i.e., reaction-related) textures involving carpholite and chloritoid, which consistently account for the consistent enrichment in Mg of both minerals through time, and the progressive replacement of carpholite by chloritoid. Mg/Fe distribution coefficients calculated between carpholite and chloritoid vary widely within samples (2.2–20.0). Among this range, only values of 7–11 correlate with equilibrium textures, in agreement with data from the literature. Equilibrium phase diagrams for metapelitic compositions are calculated using a newly modified thermodynamic dataset, including most recent data for carpholite, chloritoid, chlorite, and white mica, as well as further refinements for Fe–carpholite, and both chloritoid end-members, as required to reproduce accurately petrologic observations (phase relations, experimental constraints, Mg/Fe partitioning). Modelling reveals that Mg/Fe partitioning between carpholite and chloritoid is greatly sensitive to temperature and calls for a future evaluation of possible use as a thermometer. In addition, calculations show significant effective bulk composition changes during prograde metamorphism due to the fractionation of chloritoid formed at the expense of carpholite. We retrieve P–T conditions for several carpholite and chloritoid growth stages (1) during prograde stages using unfractionated, bulk-rock XRF analyses, and (2) at peak conditions using compositions fractionated for chloritoid. The P–T paths reconstructed for the Kütahya and Afyon areas shed light on contrasting temperature conditions for these areas during prograde and peak stages.

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