High-pressure silicate liquidus data: Retrieval of partial molar enthalpy and partial molar entropy of mixing, a test of the regular solution formulation, and comments on the P-T modelling of ascending magmas

Details High-pressure silicate liquidus data: Retrieval of partial molar enthalpy and partial molar entropy of mixing, a test of the regular solution formulation, and comments on the P-T modelling of ascending magmas High-pressure silicate liquidus data: Retrieval of partial molar enthalpy and partial molar entropy of mixing, a test of the regular solution formulation, and comments on the P-T modelling of ascending magmas

Sep 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..49..231m&link_type=abstract

Earth and Planetary Science Letters, Volume 49, Issue 2, p. 231-236.

Computer Science

1

Scientific paper

The activity of a silicate liquid component in a melt at an elevated liquidus temperature and pressure may be expressed analytically in terms of the 1-bar liquidus temperature activity and functions of the partial molar volume and partial molar enthalpy of mixing. Alternatively, the activity of the elevated (i.e. higher P-T) liquidus may be expressed in terms of the difference of heat content, heat capacity, entropy and volume of the component in the crystalline form and in the melt. Equating these two expressions, the partial molar enthalpy of mixing and there-from the partial molar entropy of mixing may be determined, provided the liquidus temperatures of the phase in question at both 1 bar and higher pressure and at a constant melt composition are known. Several such retrievals for CaMgSi2O6, Mg2SiO4, NaAlSi3O8, and TiO2 from experimental phase equilibrium data are presented. It is argued that as the partial molar enthalpy of mixing generally has large values, the regular solution formulation on the basis of a constant function of the activity coefficient would lead to erroneous P-T estimates for ascending magmas.

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