Chromian spinels as petrogenetic indicators; thermodynamics and petrological applications

A model is developed for the thermodynamic properties of chromian spinels of petrological interest. The model is internally consistent with the thermodynamic data of Berman. A geothermometer based on exchange of Fe and Mg between olivine and spinel is developed which may be applied with confidence t...

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Bibliographic Details
Published in:The American mineralogist 1991-06, Vol.76 (5-6), p.827-847
Main Authors: Sack, Richard O, Ghiorso, Mark S
Format: Article
Language:English
Subjects:
chrome spinel
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
geochemistry
geologic thermometry
igneous and metamorphic rocks
metamorphic rocks
metamorphism
mineral assemblages
Mineralogy
minerals
nonsilicates
oxides
P-T conditions
Petrology
phase equilibria
Physics
properties
Structure of solids and liquids
crystallography
theoretical studies
thermodynamic properties
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Summary:A model is developed for the thermodynamic properties of chromian spinels of petrological interest. The model is internally consistent with the thermodynamic data of Berman. A geothermometer based on exchange of Fe and Mg between olivine and spinel is developed which may be applied with confidence to assemblages formed at low P and at T 400-1400 degrees C. Phase relations within the spinel prism [(Fe,Mg)(Al,Cr,Fe3+)2O4] are calculated for T over the range 500-600 degrees C and compare favourably with petrological observations.
ISSN:0003-004X
1945-3027