Thermodynamics in Earth and Planetary Sciences by Jibamitra Ganguly

Author:Jibamitra Ganguly
Language: eng
Format: epub
ISBN: 9783030208790
Publisher: Springer International Publishing

Hillert and co-workers (e.g. Hillert 2001 and references therein) extended the Temkin model to treat ionic melts involving heterovalent substitutions in the cation and anion sublattices, including substitutions of neutral species. For example, they modelled the molten solution in the system Ca–CaO–SiO2 in terms of I(Ca2+)p II(O2−, SiO44−, Va2−, )2 that permits coverage of the whole range of the compositional triangle. In this sublattice formalism, Va2− and SiO2o stand for divalent anion vacancy and neutral SiO2 molecule, respectively. The CaO–Al2O3 liquid was modelled as (Ca2+, Al3+)p(O2−, AlO1.5o)q. In these schemes, the coefficients p and q have variable magnitudes that are dictated by the requirement of preserving electrical neutrality of the solution with changing composition. The approach of Hillert and co-workers may be expanded and adapted to treat multicomponent silicate melts that are of great importance to understand magma generation by partial melting of rocks.

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