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Journal of Petrology | Volume 27 | Number 4 | Pages 827-842 | 1986
© Oxford University Press 1986

research-article

Thermochemical Data on Mineral Phases: The System CaO-MgO-Al2O3-SiO2

SURENDRA K. SAXENA and NILANJAN CHATTERJEE

Department of Geology, Brooklyn College Brooklyn, New York 11210 and Department of Earth and Environmental Sciences, Graduate School, The City University of New York New York, New York 10036

Received February 26, 1985; Revised typescript accepted November 12, 1985

ABSTRACT

Thermochemical data on several phases forming in the system CaO-MgO-Al2O3-SiO2 have been tested for consistency in reproducing experimental phase equilibrium relationships. Calorimetric data on enthalpy, entropy and heat capacity have been adjusted within experimental errors and new data on some phases have been estimated using phase equilibrium data. The consistency of the data in reproducing phase equilibrium relations in the multicomponent-multiphase systems has been tested by computing phase diagrams using the method of minimization of total Gibbs free energy. The recent calorimetric data on most phases can be used without any significant change except for phases that show cation disorder. Disorder corrections have been added to the heat capacity data on gehlenite, anorthite, spinel and Ca-Tschermak.


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