A) quantified elemental scan of sample BC02 showing molar CaO/[CaO + NaO0.5 + K0.5] in plagioclase and alkali feldspar (values between ca. 0 – 55 %). Plagioclase is light blue, alkali feldspar is darker blue, and the grey areas are non-feldspar phases. B) Frequency distribution showing percent of pixels in plagioclase with a given An #. C) Statistical mode of each distribution plotted in panel B as a function of wt % SiO2 of the bulk sample. D) Statistical mode of each curve plotted in panel B as a function of CaO/[CaO + NaO0.5 + K0.5] in the bulk rock. For comparison, expected mineral (plagioclase) and liquid equilibrium values are superimposed using Keq(An-Ab)pl-liq = 0.10. Grey circles are calculated using the bulk molar anorthite number and AlO1.5/ SiO2 ratio for each sample to predict the equilibrium molar anorthite number in plagioclase. Results suggest that SMG samples analyzed are out of equilibrium with their bulk rock and are more evolved than expected given their, in cases, more mafic bulk rock composition. Samples in yellow are analyzed in later sections using unmixing model. All other samples are shown in white.