Abstract
Previously reported values and properties of enthalpy of fusion of silicate minerals, heat capacity, enthalpy of
mixing and entropy of mixing of silicate melts are reviewed. The entropy of fusion of silicate minerals varies linearly with heat capacity of those melts, because both properties reflect configurational freedom of components in silicate melt. Based on the compilation of calorimetric enthalpy measured for melts of mixtures of mineral endmemer compositions, we found that enthalpy of mixing of multi-component silicate melt is controlled by interactions among network-forming oxides (SiO2, NaAlO2, KAlO2), network-modifying oxides (CaO, MgO) and intermediate oxide (CaAl2O4). Entropy of mixing of SiO2-Na2O melt is calculated by a combination of Na2O activity data and calorimetric enthalpy of mixing. The comparison with previous entropy models suggests that a quasi-chemical model and an Adam-Gibbs model overestimate the configurational entropy of mixing of SiO2-Na2O melt.
https://ror.org/03hv1ad10 
