Extended Data Fig. 10: Compositional evolution of primary NMORB and Kilauea (Hawai‘i) melt (Table S1) during fractional crystallisation at different pressures48,49.
From: A mid-crustal tipping point between silica-undersaturated and silica-oversaturated magmas
Crosses mark first 50, 75 and 90 % of crystallisation, melt paths shown to 96 % total crystallisation. Pale grey dots show comparison data: a) MORB compilation56 and b) Kilauea whole-rock and glass (GEOROC, see Supplementary Discussion for details), all normalised to 100 wt % with all Fe as FeO, and excluding MnO and P2O5 as these oxides are not considered in our model. Alkaline/sub-alkaline divide following Irvine et al.57.
