Fig. 3 | Nature Communications

Fig. 3

From: Multi-scale magnetic mapping of serpentinite carbonation

Fig. 3

Reaction path of serpentinite carbonation. CO2–SiO2 activity diagram in the system MgO–SiO2–H2O–CO2 showing the reaction path of progressive serpentinite carbonation resulting in ophimagnesite (serpentine + magnesite), soapstone (talc + magnesite), and listvenite (quartz + magnesite) formation at constant pressure and temperature. Hexagon symbols mark CO2 activity values used in Fig. 9. Mineral stability fields are calculated using the computer program Supcrt and thermodynamic database dprons96.dat50, quartz saturation is based on the thermodynamic data of Rimstidt51. The estimated pressure of 3 kbar is based on a normal thermobaric gradient in a slightly thickened crust (12 bar/°C)52. The same diagram calculated for alteration temperatures of 180 °C and 300 °C is included in the supplement (Supplementary Fig. 1)

Back to article page