Table 2 Enthalpy of ¹³C/¹²C fractionation in coexisting fluid and melt in silicate-COH under oxidizing and reducing conditions (data from Mysen 2016, 2017)

∆H_CO3(fluid)^*

11 ± 3 kJ/mol

∆H_CH4(fluid)^†

4.7 ± 0.2 kJ/mol

∆H_HCO3(fluid)^**

− 12 ± 5 kJ/mol

∆H_CH4(melt)^†

− 4.8 ± 0.6 kJ/mol

∆H_CO3(melt)^*

− 30 ± 4 kJ/mol

∆H_Kmelt/fluid^b

9.5 ± 0.8 kJ/mol

∆H_HCO3(melt)^**

29 ± 6 kJ/mol

∆H_{∑13C/∑12C}(melt)^a

− 9 ± 1.6 kJ/mol

∆H_{∑13C/∑12C}(fluid)^a

− 5.8 ± 1.3 kJ/mol

∆H_Kmelt/fluid^b

3.2 ± 0.7 kJ/mol