Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/346
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dc.contributor.authorallFiebig, J.; Institut de Mineralogie et Geochimie, Universite´ de Lausanne, BFSH 2, CH-1015 Lausanne, Switzerlanden
dc.contributor.authorallChiodini, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italiaen
dc.contributor.authorallCaliro, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italiaen
dc.contributor.authorallRizzo, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italiaen
dc.contributor.authorallSpangenberg, J.; Institut de Mineralogie et Geochimie, Universite´ de Lausanne, BFSH 2, CH-1015 Lausanne, Switzerlanden
dc.contributor.authorallHunziker, J. C.; Institut de Mineralogie et Geochimie, Universite´ de Lausanne, BFSH 2, CH-1015 Lausanne, Switzerlanden
dc.date.accessioned2005-08-04T14:52:51Zen
dc.date.available2005-08-04T14:52:51Zen
dc.date.issued2004en
dc.identifier.urihttp://hdl.handle.net/2122/346en
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 bytesen
dc.format.extent539 bytesen
dc.format.mimetypeapplication/pdfen
dc.format.mimetypetext/htmlen
dc.language.isoEnglishen
dc.publisher.nameElsevieren
dc.relation.ispartofGeochimica et Cosmochimica Actaen
dc.relation.ispartofseries10/68(2004)en
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.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumber2321–2334en
dc.identifier.URLhttp://www.sciencedirect.com/en
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
dc.identifier.doidoi:10.1016/j.gca.2003.10.035en
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dc.description.fulltextpartially_openen
dc.contributor.authorFiebig, J.en
dc.contributor.authorChiodini, G.en
dc.contributor.authorCaliro, S.en
dc.contributor.authorRizzo, A.en
dc.contributor.authorSpangenberg, J.en
dc.contributor.authorHunziker, J. C.en
dc.contributor.departmentInstitut de Mineralogie et Geochimie, Universite´ de Lausanne, BFSH 2, CH-1015 Lausanne, Switzerlanden
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italiaen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italiaen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italiaen
dc.contributor.departmentInstitut de Mineralogie et Geochimie, Universite´ de Lausanne, BFSH 2, CH-1015 Lausanne, Switzerlanden
dc.contributor.departmentInstitut de Mineralogie et Geochimie, Universite´ de Lausanne, BFSH 2, CH-1015 Lausanne, Switzerlanden
item.openairetypearticle-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextrestricted-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
crisitem.author.deptGoethe University, Frankfurt a.M., Germany-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Bologna, Bologna, Italia-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione OV, Napoli, Italia-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Milano, Milano, Italia-
crisitem.author.deptInstitut de Mineralogie et Geochimie, Universite´ de Lausanne, BFSH 2, CH-1015 Lausanne, Switzerland-
crisitem.author.deptInstitut de Mineralogie et Geochimie, Universite´ de Lausanne, BFSH 2, CH-1015 Lausanne, Switzerland-
crisitem.author.orcid0000-0001-5074-1462-
crisitem.author.orcid0000-0002-0628-8055-
crisitem.author.orcid0000-0002-8522-6695-
crisitem.author.orcid0000-0003-2225-3781-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.classification.parent03. Hydrosphere-
crisitem.classification.parent04. Solid Earth-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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