Carbon is a major element in the Earth’s system and plays an important role in many geochemical processes including metamorphism, volcanism, oceanic systems and atmospheric evolution. Knowledge and understanding of chemical speciation, mineral solubility and reactivity involving carbon are very important in order to qualitatively and quantitatively understand these processes. Indeed, dissolved inorganic carbon is among the major components of natural geothermal fluids. It originates from various sources including magmatic degassing, rock dissolution and organic matter degradation (e.g., Giggenbach 1992; Giggenbach et al. 1993; Simmons and Cristenson 1994; Sanoa and Marty 1995). Dissolved CO2 is...

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