Fig. 10
![Fig. 10](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40645-018-0203-8/MediaObjects/40645_2018_203_Fig10_HTML.png)
Carbon isotope melt/fluid exchange equilibrium coefficient in silicate–COH systems as a function of temperature and pressure. a Under oxidizing conditions with all carbon residing in CO32− and HCO3− groups. Note that these redox conditions are similar to those of Mattey (1991) and Mattey et al. (1990) who reported log values in the 0.09 to − 0.83 range in the 1200–1400 °C range depending on silicate composition. b Under reducing conditions with all carbon residing in CH4 and/or CH3 groups. The ∆H values from these slopes are reported in Table 1. Data otherwise from Mysen (2016, 2017)