Fig. 2: High-pressure reaction experiments of IBC partial melt with olivine and orthopyroxene.
From: Titanium-rich basaltic melts on the Moon modulated by reactive flow processes
a, Mg–Fe–Al map of experiment GPC 823 (1,370 °C, 1.5 GPa, 2 h). Olivine undergoes coupled Fe–Mg exchange with the melt, seen as an undulate reaction front, thereby releasing Mg into the melt. Orthopyroxene shows strongly bimodal compositions with more Ca- and Ti-rich rims. The dashed line labelled ‘C’ is the orthopyroxene profile shown in panel c. b, Core-to-rim profiles of Mg# and CaO content through a representative olivine crystal (GPC 822 olivine 1; Supplementary Fig. 7). c, Core-to-rim profiles of Mg#, CaO and TiO2 content through a representative orthopyroxene crystal (GPC 823; see dashed line in panel a). d, Diagram of CaO versus Al2O3 content illustrating the peritectic reaction between orthopyroxene and the IBC melt where the reactant orthopyroxene crystals have formed Ca-rich rims. The composition of orange and red primitive basaltic glasses3,4 is shown for comparison.
