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Feldspar ternary diagram8/25/2023 ![]() ![]() The activity expressions of this model permit yet another formulation of the two-feldspar geothermometer that fully takes ternary solution into account it yields three temperatures, one each for Ab, Or, and An equilibria. Most ternary feldspars have negative excess volumes-an important constraint on pressure corrections in geothermometry. The new model is consistent with most occurrences of natural ternary feldspars and with experiments on strongly ternary feldspars. Excess terms for the An-Or join and for ternary interaction were obtained from Seek's experiments by the method of linear least squares. (1980) are used for the plagioclase binary join and those of Haselton et al. The excess free-energy expressions of Newton et al. A revised thermodynamic model for ternary feldspars-an extension of the approach of Ghiorso (1984)-was made possible by (a) inclusion of volume data for ternary feldspars and (b) adjustment of the compositions (within analytical error) of some of the experimental data points (Seek, 1971a). ![]()
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