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Results of thermochemical calculations. Concentrations at 500°C (a) and 1,500°C (b). CH4 is predicted to be prevalent at 500°C above 0.9 GPa, as shown in a, but H2 becomes dominant at 1,500°C, as shown in b. Concentrations are shown per kg of H2O/CaCO3/FeO mixture. Liquid phases are denoted by (l), and solid phases are denoted by (s). Lines representing more than one species are labeled with a /.
