Fig. 1From: Fluids and physicochemical properties and processes in the EarthModified from Evans and Tomkins (2020)H2 and CO2 generation during metamorphic processes. A. Cumulative H2O loss as a function of increasing metamorphic grade. B. CO2 loss from decarbonation reactions at 0.5 GPa as a function of CO2–H2O fluid composition. Back to article page