Fig. 3: Chemical affinity of plagioclase and clinopyroxene formation reaction variations respond to P–T changes.
From: Thermodynamic insights into the reliability of mineral-based thermobarometers
a, b Chemical affinity responds to P–T for plagioclase and clinopyroxene formation. The green shaded area represents the ±2σ range of affinity variations obtained by 2000 random synthetic solid and liquid composition sampling drawn from Gaussian distribution with synthetic analytical precisions (1σ/mean; wt.%) under the experimental condition. The water content of the liquid used in the calculations is the reported value of the experiment. Precisions of each oxide are set as follows: 10% for Na2O, TiO2, K2O, MnO, Cr2O3 and 5% for the others. Lines in different colors signify affinity contour lines for different temperatures. c, d 3D representation of the chemical affinity as a function of pressure and temperature. The experiment selected is FM15748.
