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This study tests the overall consistency of geothermobarometric calibrations and thermodynamic internally consistent databases commonly used to retrieve temperature and pressure conditions in metapelitic and igneous mafic protolith metamorphosed at granulite-facies conditions. We examine a lithological sequence characterized by interbedded mafic and metapelitic protoliths that underwent partial melting...
Melt-producing reactions have operated both in pelitic xenoliths and in pelitic migmatites, but melt-consuming reactions, related to in situ melt crystallization, are largely restricted to migmatites. Hence, xenolith reaction textures may provide clues on the relative roles of both reaction types in migmatites. A comparison of xenoliths and migmatites results in a catalogue of textural and chemical...
Reaction histories in xenoliths are commonly based on textural analysis alone and are often highly disputed. In this paper we propose a more rigorous approach that combines textural analysis, reaction balance calculations and quantitative P–T pseudosections using model reactions. Examples highlighting the power of this approach are: disequilibrium behaviour of plagioclase in a partial melting reaction;...
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