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The amphibole-plagioclase NaSi-CaAl exchange thermometer by  Holland and Blundy (1994)  (expression B) has been extensively applied to calcic amphibole-bearing assemblages from metamorphic and igneous rocks, whereas the more recent calibrations of the amphibole-only thermometer by  Ridolfi and Renzulli (2012)  (expression 2) and  Putirka (2016)  (expressions 5 and 6) are employed for determining amphibole-saturation temperatures in hydrous magmas. However, a test of these expressions performed on experimental data compiled from the literature reveals significant inaccuracies, tending expression B to underestimate temperatures in high-Mg amphibole, and the amphibole-only expressions to overestimate temperatures in amphibole with either low Mg or high Al VI  occupancies. Amphibole Na M4  and Fe 3+  occupancies can also affect significantly the accuracy of expression B.

A reassessment of the amphibole-plagioclase NaSi-CaAl exchange thermometer with applications to igneous and high-grade metamorphic rocks