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Fig. 3 | Progress in Earth and Planetary Science

Fig. 3

From: Redox-controlled mechanisms of C and H isotope fractionation between silicate melt and COH fluid in the Earth’s interior

Fig. 3

Abundance of C-bearing species in coexisting COH fluids and melts as a function of temperature and pressure as indicated. a Evolution of carbonate species under oxidizing conditions. b Evolution of C-bearing species under reducing conditions. c Evolution of fluid/melt exchange of carbonate species under oxidizing conditions. d Evolution of fluid/melt exchange of C-bearing reduced species under reducing conditions. Note that temperature is the independent variable with pressure evolving as a function of temperature as described briefly in the text and in more detail in the original sources (modified after Mysen 2015a, 2015b). The ∆H values derived from the linear regression of the data are discussed in the text. In calculated these ∆H values, it was assumed that there is no pressure effect on these equilibria

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