'Royal College of Obstetricians & Gynaecologists (RCOG)'
Abstract
A set of thermodynamic models is presented that, for the first time, allows partial melting equilibriato be calculated for metabasic rocks. The models consist of new activity–composition relations com-bined 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 ofbroadly trondhjemitic–tonalitic composition, and for augitic clinopyroxene with Si–Al mixing on thetetrahedral sites, while existing activity–composition relations for hornblende are extended to includeK2O and TiO2. Calibration of the activity–composition relations was carried out with the aim ofreproducing major experimental phase-in/phase-out boundaries that define the amphibolite–granulitetransition, across a range of bulk compositions, at ≤13 kbar.</p
