Activity-composition relations for the calculation of partial melting equilibria in metabasic rocks

E. C. R. Green*, R. W. White, J. F. A. Diener, R. Powell, T. J. B. Holland, R. M. Palin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

313 Citations (Scopus)


A set of thermodynamic models is presented that, for the first time, allows partial melting equilibria to be calculated for metabasic rocks. The models consist of new activity-composition relations combined with end-member thermodynamic properties from the Holland & Powell dataset, version 6. They allow for forward modelling in the system Na2O-CaO-K2O-FeO-MgO-Al2O3-SiO2-H2O-TiO2- Fe2O3. In particular, new activity-composition relations are presented for silicate melt of broadly trondhjemitic-tonalitic composition, and for augitic clinopyroxene with Si-Al mixing on the tetrahedral sites, while existing activity-composition relations for hornblende are extended to include K2O and TiO2. Calibration of the activity-composition relations was carried out with the aim of reproducing major experimental phase-in/phase-out boundaries that define the amphibolite-granulite transition, across a range of bulk compositions, at ≤13 kbar.

Original languageEnglish
Pages (from-to)845-869
Number of pages25
JournalJournal of Metamorphic Geology
Issue number9
Early online date31 Aug 2016
Publication statusPublished - 6 Nov 2016


  • Amphibolite
  • Calibration
  • Granulite
  • Holland & Powell dataset
  • Pseudosection


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