It was found that the new model largely eliminates discrepancies between observed and predicted feldspar compositions that were present in earlier attempts. a teschenite sill in Scotland, the Klokken syenogabbro in Greenland, and a granulite-facies metapelite in Sri Lanka) were used to test the mixing models. Natural feldspar assemblages from well-studied magmatic and high-grade metamorphic rocks (i.e. The incorporation of K into Ca-rich plagioclase and of Ca into K-rich alkali feldspar is more strongly limited by our calorimetry-based model, whereas the stability field of Na-rich feldspars is broadened. Comparisons with existing mixing models, which are based on phase-equilibrium experiments, reveal distinct differences. A mixing model for high structural state ternary feldspars in the NaAlSi 3O 8–KAlSi 3O 8–CaAl 2Si 2O 8 system is presented based exclusively on calorimetric and volumetric measurements.
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