Figure 2: Predicted aqueous phase evolution during fluid–rock interactions forming diamond.
From: Diamond formation due to a pH drop during fluid–rock interactions
(a) Evolution of the pH of the fluid during reaction with eclogite. (b) Evolution of the concentrations of the major inorganic oxidized carbon species. (c) Number of moles of diamond precipitated per kg of water compared with the evolution of the concentrations of the major aqueous organic carbon species. In a,b,c, the x axis represents the logarithm of the reaction progress variable ξ, which is equal to the number of moles of each reactant mineral destroyed during the reaction progress. All calculations refer to 900 °C and 5.0 GPa.
