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dc.contributor.authorallFiebig, J.; Institut de Mineralogie et Geochimie, Universite´ de Lausanne, BFSH 2, CH-1015 Lausanne, Switzerland-
dc.contributor.authorallChiodini, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia-
dc.contributor.authorallCaliro, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia-
dc.contributor.authorallRizzo, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia-
dc.contributor.authorallSpangenberg, J.; Institut de Mineralogie et Geochimie, Universite´ de Lausanne, BFSH 2, CH-1015 Lausanne, Switzerland-
dc.contributor.authorallHunziker, J. C.; Institut de Mineralogie et Geochimie, Universite´ de Lausanne, BFSH 2, CH-1015 Lausanne, Switzerland-
dc.description.abstractThe chemical and isotopic composition of fumarolic gases emitted from Nisyros Volcano, Greece,and of a single gas sample from Vesuvio, Italy, was investigated in order to determine the origin of methane (CH4) within two subduction-related magmatic-hydrothermal environments. Apparent temperatures derived from carbon isotope partitioning between CH4 and CO2 of around 340°C for Nisyros and 470°C for Vesuvio correlate well with aquifer temperatures as measured directly and/or inferred from compositional data using the H2O-H2-CO2-CO-CH4 geothermometer. Thermodynamic modeling reveals chemical equilibrium between CH4, CO2 and H2O implying that carbon isotope partitioning between CO2 and CH4 in both systems is controlled by aquifer temperature. N2/3He and CH4/3He ratios of Nisyros fumarolic gases are unusually low for subduction zone gases and correspond to those of midoceanic ridge environments. Accordingly, CH4 may have been primarily generated through the reduction of CO2 by H2 in the absence of any organic matter following a Fischer-Tropsch-type reaction. However, primary occurrence of minor amounts of thermogenic CH4 and subsequent re-equilibration with co-existing CO2 cannot be ruled out entirely. CO2/3He ratios and 13CCO2 values imply that the evolved CO2 either derives from a metasomatized mantle or is a mixture between two components, one outgassing from an unaltered mantle and the other released by thermal breakdown of marine carbonates. The latter may contain traces of organic matter possibly decomposing to CH4 during thermometamorphism.en
dc.description.sponsorshipEuropean communityen
dc.format.extent829360 bytes-
dc.format.extent539 bytes-
dc.relation.ispartofGeochimica et Cosmochimica Actaen
dc.subjectfumarolic gasesen
dc.subjecthydrothermal systemsen
dc.subjectchemical and isotopic equilibriumen
dc.titleChemical and isotopic equilibrium between CO2 and CH4 in fumarolic gas discharges: generation of CH4 in magmatic-hydrothermal systemsen
dc.subject.INGV03. Hydrosphere::03.04. Chemical and biological::03.04.06. Hydrothermal systemsen
dc.subject.INGV04. Solid Earth::04.08. Volcanology::04.08.01. Gasesen
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dc.contributor.authorFiebig, J.-
dc.contributor.authorChiodini, G.-
dc.contributor.authorCaliro, S.-
dc.contributor.authorRizzo, A.-
dc.contributor.authorSpangenberg, J.-
dc.contributor.authorHunziker, J. C.-
dc.contributor.departmentInstitut de Mineralogie et Geochimie, Universite´ de Lausanne, BFSH 2, CH-1015 Lausanne, Switzerland-
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia-
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia-
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia-
dc.contributor.departmentInstitut de Mineralogie et Geochimie, Universite´ de Lausanne, BFSH 2, CH-1015 Lausanne, Switzerland-
dc.contributor.departmentInstitut de Mineralogie et Geochimie, Universite´ de Lausanne, BFSH 2, CH-1015 Lausanne, Switzerland-
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crisitem.classification.parent04. Solid Earth- de Mineralogie et Geochimie, Universite´ de Lausanne, BFSH 2, CH-1015 Lausanne, Switzerland- University, Frankfurt a.M., Germany- Nazionale di Geofisica e Vulcanologia (INGV), Sezione OV, Napoli, Italia- de Mineralogie et Geochimie, Universite´ de Lausanne, BFSH 2, CH-1015 Lausanne, Switzerland- Nazionale di Geofisica e Vulcanologia (INGV), Sezione OV, Napoli, Italia- Nazionale di Geofisica e Vulcanologia (INGV), Sezione Palermo, Palermo, Italia- Nazionale di Geofisica e Vulcanologia- Nazionale di Geofisica e Vulcanologia- Nazionale di Geofisica e Vulcanologia-
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