Calculation of Phase Relations Involving Haplogranitic Melts Using an Internally Consistent Thermodynamic Dataset |
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| Authors: | HOLLAND TIM; POWELL ROGER |
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| Institution: | 1DEPARTMENT OF EARTH SCIENCES, UNIVERSITY OF CAMBRIDGE, DOWNING STREET, CAMBRIDGE CB2 3EQ, UK
2SCHOOL OF EARTH SCIENCES, UNIVERSITY OF MELBOURNE, PARKVILLE, VIC. 3052, AUSTRALIA |
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| Abstract: | A simple thermodynamic model is developed for silicate meltsin the system CaO–Na2O–K2O–Al2O3–SiO2–H2O(CNKASH). The Holland & Powell (Journal of Metamorphic Geology,16, 289–302, 1998) internally consistent thermodynamicdataset is extended via the incorporation of the experimentallydetermined melting relationships in unary and binary subsystemsof CNKASH. The predictive capability of the model is evaluatedvia the experimental data in ternary and quaternary subsystems.The resulting dataset, with the software THERMOCALC, is thenused to calculate melting relationships for haplogranitic compositions.Predictions of the P–T stabilities of assemblages in water-saturatedand -undersaturated bulk compositions are illustrated. It isnow possible to make useful calculations of the melting behaviourof appropriate composition rocks under crustal conditions. KEY WORDS: thermodynamics; melts; granite; dataset |
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