Constitution of the Moon: 1. Assessment of thermodynamic properties and reliability of phase relation calculations in the FeO-MgO-Al2O3-SiO2 system

Details Constitution of the Moon: 1. Assessment of thermodynamic properties and reliability of phase relation calculations in the FeO-MgO-Al2O3-SiO2 system Constitution of the Moon: 1. Assessment of thermodynamic properties and reliability of phase relation calculations in the FeO-MgO-Al2O3-SiO2 system

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pepi...83..175f&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 83, Issue 3-4, p. 175-196.

Physics

8

Scientific paper

The thermodynamic functions of minerals in the FeO-MgO-Al2O3-SiO2 (FMAS) system have been assessed using phase equilibria, equations of state and calorimetric data. Phase equilibria in this system have been calculated using ideal, symmetric and asymmetric models of solid solution for minerals to obtain KD of exchange reactions consistent with experimental data. A symmetric model for olivine (Wol = 10 800 J mol-1), spinel (Wsp = 1300 J mol-1) and pyroxene (WFeAlopx = WAlFeopx = -3383 - 2.35T - 0.4723P) and an asymmetric model for garnet (WFeMggr = 230 + 0.01P, WMgFegr = 3720 + 0.06P) were recommended, as these mixing parameters provide a better agreement for the calculated phase equilibria with the totality of experimental data. The THERMOSEISM database which includes experimental and assessed data on thermodynamic and thermoelastic properties (bulk modulus and its pressure derivative, thermal expansion, heat capacity, volume, Debye temperature, enthalpy of formation, entropy and mixing parameters of solid solutions), has been obtained for calculation of mineral assemblages at high pressure and temperature and for the further application to the modelling of the mineral composition of the lunar mantle.

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