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    Order/disorder phase transition in cordierite and its possible relationship to the development of symplectite reaction textures in granulites

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    Access Status
    Open access
    Authors
    Vinograd, V.
    Perchuk, L.
    Gerya, T.
    Putnis, A.
    Winkler, B.
    Gale, Julian
    Date
    2007
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Vinograd, V.L. and Perchuk, L.L. and Gerya, T.V. and Putnis, A. and Winkler, B. and Gale, J. D. 2007. Order/disorder phase transition in cordierite and its possible relationship to the development of symplectite reaction textures in granulites. Petrology. 15 (5): 427-440.
    Source Title
    Petrology
    DOI
    10.1134/S0869591107050013
    Faculty
    Department of Applied Chemistry
    Division of Engineering, Science and Computing
    Faculty of Science
    Remarks

    The original publication is available at http://link.springer.com/article/10.1134%2FS0869591107050013

    © Pleiades Publishing, Ltd. 2007.

    URI
    http://hdl.handle.net/20.500.11937/12743
    Collection
    • Curtin Research Publications
    Abstract

    Based on a consistent set of empirical interatomic potentials, static structure energy calculations of various Al/Si configurations in the supercell of Mg-cordierite and Monte Carlo simulations the phase transition between the orthorhombic and hexagonal modifications of cordierite (Crd) is predicted at 1623 K. The temperature dependences of the enthalpy, entropy, and free energy of the Al/Si disorder were calculated using the method of thermodynamic integration. The simulations suggest that the commonly observed crystallization of cordierite in the disordered hexagonal form could be related to a tendency of Al to occupy T1 site, which is driven by local charge balance. The increase in the Al fraction in the T1 site over the ratio of 2/3(T1): 1/3(T2), that characterizes the ordered state, precludes formation of the domains of the orthorhombic phase. This intrinsic tendency to the crystallization of the metastable hexagonal phase could have significantly postponed the formation of the association of orthorhombic cordierite and orthopyroxene over the association of quartz and garnet in metapelites subjected to granulite facies metamorphism. The textures of local metasomatic replacement (the formation of Crd + Opx or Spr + Crd symplectites between the grains of garnet and quartz) indicate the thermodynamic instability of the association of Qtz + Grt at the moment of the metasomatic reaction. This instability could have been caused by the difficulty of equilibrium nucleation of orthorhombic cordierite.

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