Extended Data Fig. 2: Solidus and phase relations of pyrolite at IW+2.0 (with MH mixture) and IW-1.2 (Re capsule).
From: Melting at the base of a terrestrial magma ocean controlled by oxygen fugacity
The black and yellow pentagrams present the mineral assemblages at subsolidus and above solidus, respectively. At IW+2.0, the phase assemblage at 16 GPa is Wd+Gt at 1600 °C, Wd+Gt+Gl at 1700 °C, and Wd+Gt+Gl at 1800 °C; at 21 GPa, Rw+Gt at 1800 °C, Rw+Gt+Fp+Gl at 1900 °C, and Gt+Gl at 2000 °C; at 26 GPa, Bg+Fp+Cpv at 1700–2000 °C and Bg+Fp+Cpv+Gl at 2100 °C. In Re capsules (IW-1.2), the phase relations and minimum solidus (indicated by the red arrows) are from Ishii et al.19. The temperature difference of these two solidi at a ~3.2 log units average difference in fO2 is approximately 450 °C at 16 GPa, 330 °C at 21 GPa, and 230 °C at 26 GPa. Gt, garnet; Ol, olivine; Cpx, Ca-rich clinopyroxene; Wd, wadsleyite; Rw, ringwoodite; Bg, bridgmanite; Fp, ferropericlase; Cpv, CaSiO3-rich perovskite.
