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Calculation of partial melting equilibria in the system Na2O–CaO–K2O–FeO–MgO–Al2O3–SiO2–H2O (NCKFMASH)

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A thermodynamic model for haplogranitic melts in the system Na2O–CaO–K2O–Al2O3–SiO2–H2O (NCKASH) is extended by the addition of FeO and MgO, with the data for the additional end-members of the liquid incorporated in the Holland & Powell (1998) internally consistent thermodynamic dataset. The resulting dataset, with the softwarethermocalc, is then used to calculate melting relationships for metapelitic rock compositions. The main forms for this are PT and TX pseudosections calculated for particular rock compositions and composition ranges. The relationships in these full-system pseudosections are controlled by the low-variance equilibria in subsystems of NCKFMASH. In particular, the solidus relationships are controlled by the solidus relationships in NKASH, and the ferromagnesian mineral relationships are controlled by those in KFMASH. However, calculations in NCKFMASH allow the relationships between the common metapelitic minerals and silicate melt to be determined. In particular, the production of silicate melt and melt loss from such rocks allow observations to be made about the processes involved in producing granulite facies rocks, particularly relating to open-system behaviour of rocks under high-grade conditions.
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Keywords: NCKFMASH system; P–T and T–X pseudosections; partial melting equilibria; thermocalc; thermodynamic model

Document Type: Research Article

Affiliations: 1: School of Earth Sciences, University of Melbourne, Parkville, Victoria 3052, Australia 2: Department of Earth Sciences, University of Cambridge, Cambridge, CB2 3EQ, UK

Publication date: 2001-02-01

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