Figure 5 | Scientific Reports

Figure 5

From: Hydrothermal calcite formation in Campi Flegrei caldera, Italy: unraveling carbon sink processes in alkaline volcanic systems

Figure 5

δ18O and δ13C of calcites hosted in lithic fragments of the Campi Flegrei eruptions. Values obtained for the calcite from Campi Flegrei caldera boreholes (CF boreholes), δ13CCO2 of biogenic source and δ18O of meteoric water are also shown (data from22,34). The path AA’ (with A’ at remaining mole fraction F of the carbon = 0.025) is an example trend of Rayleigh volatilization, assuming normal calc-silicate decarbonation35 at 500 °C. The errors are within the symbols.

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