The Solubility of Alumina in Orthopyroxene Coexisting with Garnet in FeO-MgO--Al2O3--SiO2 and CaO--FeO--MgO--Al2O3--SiO2
- 1 August 1984
- journal article
- Published by Oxford University Press (OUP) in Journal of Petrology
- Vol. 25 (3) , 665-696
- https://doi.org/10.1093/petrology/25.3.665
Abstract
The pressure-temperature-compositional (P-T-X) dependence of the solubility of Al2O3 in orthopyroxene coexisting with garnet has been experimentally determined in the P-T range 5–30 kilobars and 800–1200 °C in the system FeO—MgO—Al2O3—SiO2 (FMAS). These results have been extended into the CaO—FeO—MgO—Al2O3—SiO2 (CFMAS) system in a further set of experiments designed to determine the effect of the calcium content of garnet on the Al2O3 contents of coexisting orthopyroxene at near-constant Mg/(Mg + Fe). Starting materials were mainly glasses of differing Mg/(Mg + Fe) or Ca/(Ca + Mg + Fe) values, seeded with garnet and orthopyroxene of known composition, but mineral mixes were also used to demonstrate reversible equilibrium. Experiments were performed in a piston-cylinder apparatus using a talc/pyrex medium.Keywords
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