Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/12232
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dc.date.accessioned2019-02-08T14:09:52Zen
dc.date.available2019-02-08T14:09:52Zen
dc.date.issued2018-06-05en
dc.identifier.urihttp://hdl.handle.net/2122/12232en
dc.description.abstractThe Guanacaste Geothermal Province (GGP) encompasses the three major volcanoes of northern Costa Rica, namely from NW to SE: Rincón de la Vieja, Miravalles, and Tenorio. The dominant occurrence of (i) SO4-rich acidic fluids at Rincón de la Vieja, (ii) Cl-rich mature fluids at Miravalles, and (iii) HCO− 3 -rich and low-temperature fluids at Tenorio was previously interpreted as due to a north-to-south general flow of thermal waters and a magmatic gas upwelling mostly centered at Rincón de la Vieja, whereas Miravalles volcano was regarded as fed by a typical geothermal reservoir consisting of a highly saline Na-Cl aquifer. The uniformity in chemical and isotopic (R/Ra and d34S) compositions of the neutral Cl-rich waters suggested to state that all the thermal discharges in the GGP are linked at depth to a single, regional geothermal system. In this scenario, the thermal manifestations related to Tenorio volcano were regarded as a distal and diluted fluid outflow. In this study, a new gas geochemical dataset, including both chemical and isotopic (d13C-CO2 and R/Ra) parameters of fluid discharges fromthe three volcanoes, is presented and discussed. Particular attention was devoted to the Tenorio thermal manifestations, since they were poorly studied in the past because this area has been considered of low geothermal potential. The aim is to provide insights into the magmatic-hydrothermal fluid circulation and to verify the spatial distribution of the heat fluid source feeding the fluid manifestations. According to this new dataset, CO2, i.e., the most abundant dry gas in the fluid manifestations, is mostly produced by limestone, whereas the mantle CO2 contribution is ≤3.3%. Strongly acidic gas compounds from magma degassing were absent in the discharged fluids, being scrubbed by secondary processes related to prolonged fluid-rock interactions and mixing with shallow aquifers. Our results only partially confirmthe previously depictedmodel, because the geochemical and isotopic features (e.g., relatively high concentrations of temperature-dependent gases and high R/Ra values) shown by fluids seeping out from the southern sector of Tenorio volcano are more representative of medium-to-high enthalpy volcanic systems than those typically occurring in distal areas. This implies that the geothermal potential in the south of the GGP is higher than previously thought.en
dc.language.isoEnglishen
dc.relation.ispartofFrontiers in Earth Scienceen
dc.relation.ispartofseries/6 (2018)en
dc.rightsCC0 1.0 Universalen
dc.rights.urihttp://creativecommons.org/publicdomain/zero/1.0/en
dc.subjectgeothermal prospection,en
dc.subjectgas geothermometry,en
dc.subjectfluid geochemistry,en
dc.subjectfluid reservoir,en
dc.titleThe Geothermal Resource in the Guanacaste Region (Costa Rica): New Hints From the Geochemistry of Naturally Discharging Fluidsen
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumberArticle 69en
dc.identifier.doi10.3389/feart.2018.00069en
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dc.description.obiettivoSpecifico1TR. Studi per le Georisorseen
dc.description.journalTypeJCR Journalen
dc.contributor.authorTassi, Francoen
dc.contributor.authorVaselli, Orlandoen
dc.contributor.authorBini, Giulioen
dc.contributor.authorCapecchiacci, Francescoen
dc.contributor.authorde Moor, J. Maartenen
dc.contributor.authorPecoraino, Giovannellaen
dc.contributor.authorVenturi, Stefaniaen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Palermo, Palermo, Italiaen
item.openairetypearticle-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextopen-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione OV, Napoli, Italia-
crisitem.author.deptObservatorio Vulcanol ogico y Sismol ogico de Costa Rica (OVSICORI)-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Palermo, Palermo, Italia-
crisitem.author.deptDepartment of Earth Sciences, University of Florence, Via La Pira, 4, 50121 Florence, Italy-
crisitem.author.orcid0000-0002-3319-4257-
crisitem.author.orcid0000-0001-8121-4438-
crisitem.author.orcid0000-0002-3058-1489-
crisitem.author.orcid0000-0001-5478-1912-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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