The MgO-Al2O3-SiO2 system - Free energy of pyrope and Al2O3-enstatite

Details The MgO-Al2O3-SiO2 system - Free energy of pyrope and Al2O3-enstatite The MgO-Al2O3-SiO2 system - Free energy of pyrope and Al2O3-enstatite

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981gecoa..45..821s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 45, June 1981, p. 821-825. Research supported by the City University of New York;

Computer Science

3

Aluminum Oxides, Earth Mantle, Enstatite, Gibbs Free Energy, Magnesium Oxides, Silicon Dioxide, Ternary Systems, Garnets, Geology, Phase Diagrams, Pyroxenes, Rocks, Solid Solutions, Spinel, Thermochemistry

Scientific paper

The model of fictive ideal components is used to determine Gibbs free energies of formation of pyrope and Al2O3-enstatite from the experimental data on coexisting garnet and orthopyroxene and orthopyroxene and spinel in the temperature range 1200-1600 K. It is noted that Al2O3 forms an ideal solution with MgSiO3. These thermochemical data are found to be consistent with the Al2O3 isopleths that could be drawn using most recent experimental data and with the reversed experimental data on the garnet-spinel field boundary.

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