O solubility in silicate melts at low and high pressures as a function of fugacity of H
. (A) Solubility in SiO2 melt at and below ambient pressure from Moulson and Roberts (1961). (B) Solubility in SiO2 melt at high pressure as a function of from Kennedy et al. (1962). (C) Solubility in various silicate melts as a function of as compiled by McMillan (1994).