Journal article

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

RW White, R Powell, TJB Holland

JOURNAL OF METAMORPHIC GEOLOGY | BLACKWELL SCIENCE INC | Published : 2001

Abstract

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 and Powell (1998) internally consistent thermodynamic dataset. The resulting dataset, with the software THERMOCALC, is then used to calculate melting relationships for metapelitic rock compositions. The main forms for this are P-T and T-X 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 soli..

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