However, because of the paucity of data at high temperatures and in Ab-poor regions, there are significant variations in the predicted high-temperature characteristics of the solvus. Several thermodynamic models describing the mixing behavior of components in ternary feldspars have been developed for use in geothermometry. The shape of the solvus in T-X space indicates that this solubility increases significantly with temperature but only slightly with pressure, thereby laying the foundation for ternary feldspar geothermometry. The presence of a solvus in the ternary feldspar system indicates that there is limited solubility of the three components at magmatically reasonable temperatures and pressures. The compositions of ternary feldspars coexisting in equilibrium with melts are constrained by the subsolidus characteristics in the system Ab-An-Or.
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