Biodegradation of CO2, CH4 and volatile organic compounds (VOCs) in soil gas from the Vicano-Cimino hydrothermal system (central Italy)
- Tassi, Franco
- Venturi, S.
- Cabassi, J.
- Vaselli, O.
- Gelli, I.
- Cinti, Daniele
- Capecchiacci, F.
DOIAbstract
We investigated the effect of microbial activity on the chemistry of hydrothermal fluids related to the Vicano–Cimino system, central Italy. The database included the composition and d13C CO2 and d13C CH4 values for soil gas from an area characterized by intense degassing of fluids having a deep origin. The d13C CH4 values along vertical profiles in the soil indicated that CH4 was controlled by microbial oxidation occurring at shallow (<50 cm) depth, where free O2 was available. This was consistent with the vertical gradients of CH4, H2S and O2 concentrations. The d13C CO2 values in soil gas, characterized by a composition similar to that of the hydrothermal fluids, were not significantly influenced by biodegradation. On the contrary...
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