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Journal of Petrology Volume 42 Number 4 Pages 673-683 2001
© Oxford University Press 2001
Calculation of Phase Relations Involving Haplogranitic Melts Using an Internally Consistent Thermodynamic Dataset
1DEPARTMENT OF EARTH SCIENCES, UNIVERSITY OF CAMBRIDGE, DOWNING STREET, CAMBRIDGE CB2 3EQ, UK
2SCHOOL OF EARTH SCIENCES, UNIVERSITY OF MELBOURNE, PARKVILLE, VIC. 3052, AUSTRALIA
A simple thermodynamic model is developed for silicate melts in the system CaO–Na2O–K2O–Al2O3–SiO2–H2O (CNKASH). The Holland & Powell (Journal of Metamorphic Geology, 16, 289–302, 1998) internally consistent thermodynamic dataset is extended via the incorporation of the experimentally determined melting relationships in unary and binary subsystems of CNKASH. The predictive capability of the model is evaluated via the experimental data in ternary and quaternary subsystems. The resulting dataset, with the software THERMOCALC, is then used to calculate melting relationships for haplogranitic compositions. Predictions of the P–T stabilities of assemblages in water-saturated and -undersaturated bulk compositions are illustrated. It is now possible to make useful calculations of the melting behaviour of appropriate composition rocks under crustal conditions.
KEY WORDS: thermodynamics; melts; granite; dataset
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