778_GC2010_Hamilton_Brett

778_GC2010_Hamilton_Brett - Thermodynamic modelling of...

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GeoCanada 2010 – Working with the Earth 1 Thermodynamic modelling of open-system behaviour for anatectic metapelites Brett M. Hamilton* Department of Geoscience, University of Calgary, Calgary, Alberta, Canada brett.hamilton@ucalgary.ca and David R. M. Pattison Department of Geoscience, University of Calgary, Calgary, Alberta, Canada Summary Open-system processes, including fractional melting and fractional crystallization, may occur in rocks that have undergone partial melting and these processes must be accounted for when constructing isochemical phase diagram sections for anatectic metapelites. If fractional melting occurs, there are significant changes to the location of quartz, feldspar, and subsolidous phase boundaries, but there are almost no changes to the suprasolidous phase boundaries involving mafic phases. During fractional crystallization, the modality is dominated by quartz and feldspar, and the mafic phases that crystallize are different from those that crystallize if the melt is in equilibrium with the source. With the important exception of quartz and feldspars, the P-T condition of the peak metamorphic assemblage can be predicted even if fractional melting or crystallization occurred; however, retrograde reactions cannot be modelled unless open-system
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This note was uploaded on 03/19/2012 for the course GEOLOGY 6 taught by Professor Rm during the Spring '12 term at UNAM MX.

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778_GC2010_Hamilton_Brett - Thermodynamic modelling of...

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