Figure 6
CaO/Al2O3 vs FeOtot/MgO diagram reporting average groundmass composition for clasts of the same type with differing crystallinity (blue = highly crystalline, red = moderately crystalline; green = poorly crystalline) from distinct eruptive episodes. Error bars show standard error of the mean. The star represents the most primitive glass composition measured in a poorly crystalline clast from the base of episode #1. This is the starting composition used for alphaMELTS modelling24, 25. Line A represents the liquid line of descent during crystallization of plagioclase and clinopyroxene at 0.1 < P < 25 MPa for a cooling of 30 °C under fO2 = NNO and \({f}_{{{\rm{H}}}_{{\rm{2}}}{\rm{O}}}\) = 0–1. Line B shows the liquid line of descent related to the crystallization of olivine, clinopyroxene and plagioclase at P = 0.1 MPa and T 1140–1110 °C and fO2 = QFM and \({f}_{{{\rm{H}}}_{{\rm{2}}}{\rm{O}}}\) ≈0. PC# define melt compositions that refill different episodes.
