Fig. 6: P–T diagrams showing how P–T estimates change with phase boundaries and endmember equilibrium curve variations.
From: Thermodynamic insights into the reliability of mineral-based thermobarometers
a Change in Ab equilibrium curves and their intersection points due to the addition of 3 wt.% Ab to plagioclase, with liquid composition fixed. b Results obtained by increasing MgO by 3 wt.% in liquid, with the plagioclase composition remaining fixed. c, d Variations of intersection points due to the addition of 1 wt.% Jd to clinopyroxene as well as 3 wt.% CaO increase in liquid, respectively. Red stars represent the intersection points corresponding to the experimental composition, while blue and green stars represent the intersection points after the composition is modified. Solid lines represent P–T solution curves where the total chemical affinity equals 0, approximating phase boundaries. Dashed lines represent the equilibrium curves of corresponding end members. The experiment selected is AB6250.
