Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/6005
DC FieldValueLanguage
dc.contributor.authorallChiodini, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italiaen
dc.date.accessioned2010-05-14T13:43:34Zen
dc.date.available2010-05-14T13:43:34Zen
dc.date.issued2009-06-11en
dc.identifier.urihttp://hdl.handle.net/2122/6005en
dc.description.abstractLong time series of fumarolic chemical and isotopic compositions, at Solfatara (Campi Flegrei) and Vulcano highlight the occurrence of mixing processes among magmatic and hydrothermal fluids. At Solfatara temperatures of about 360°C of the hydrothermal system are inferred by methane chemical-isotopic geoindicators and by the H2/Ar geothermometer. These high temperatures are representative of a deep zone where magmatic gases flash hydrothermalliquid forming a gas pIume where the kinetically fast reactive species (H2 and CO) re-equilibrate at temperatures of 200240°C. The stable isotope compositions of the two dominant species, i.e, H20 and C02, shows that sampled effluents are mixture between magmatic fluids and the vapor generated at about 360°C by the vaporization of hydrothermalliquids of meteotic origino Similar mixing processes between magmatic fluids and a hydrothermal component of marine origin have been recognized at Vulcano high temperature fumaroleso In both the system a typical 'andesitic' water type composition and high C02 contents characterizes the magmatic component. Our hypothesis is that pulsing injections of these C02-rich magmatic fluids at the bottom of the hydrothermal systems trigger the bradyseismic crises, periodically affecting Campi Flegrei, and the periodical volcanic unrest periods of Vulcano. At Campi Flegrei a strong increase of the fraction of the magmatic component, marked in fact the bradyseismic crisis of 1982-84 and four minor episodes occurred in 1989, 1994 and 2000 and 2006. Increases of the magmatic component in the fumaroles of Vulcano were recorded in 1979-1981, 1985, 1988, 1996, 2004 and 2005 concurrently with anomalous seismic activity localized in the erater area. Physical-numerical simulations of the injection of hot, C02 rich fluids at the base of a hydrothermal system, asses the physical feasibility the processo Ground deformations, gravitational anomalies and seismic crisis can be well explained by the complex fluid dynamic processes caused by magma degassing episodes. Data on the fumaroles of other volcanoes, for example Vesuvio, Panarea, Nisyros (Greece), Mammoth (California), suggest that magma degassing episodes frequently occur in dormant volcanoes causing volcanic unrest processes not necessarily linked to magma movement but rather to pulsating degassing processes from deep pressurized, possibly stationary, magma bodies.en
dc.description.sponsorshipINGV; AIV; Comune di Nicolosi(POrta dell'Etna)en
dc.language.isoEnglishen
dc.relation.ispartofConferenza A.Rittmann "La vulcanologia italiana:stato dell'arte e prospettive future"en
dc.subjectmagma degassingen
dc.subjectfumarolicen
dc.subjectmethaneen
dc.titleMagma degassing episodes and volcanic unrest periods in quiescent volcanoesen
dc.typeAbstracten
dc.description.statusUnpublisheden
dc.subject.INGV03. Hydrosphere::03.04. Chemical and biological::03.04.05. Gasesen
dc.subject.INGV03. Hydrosphere::03.04. Chemical and biological::03.04.06. Hydrothermal systemsen
dc.subject.INGV04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistryen
dc.subject.INGV04. Solid Earth::04.08. Volcanology::04.08.01. Gasesen
dc.description.ConferenceLocationNicolosi(Catania)en
dc.description.obiettivoSpecifico1.2. TTC - Sorveglianza geochimica delle aree vulcaniche attiveen
dc.description.obiettivoSpecifico2.4. TTC - Laboratori di geochimica dei fluidien
dc.description.obiettivoSpecifico4.5. Studi sul degassamento naturale e sui gas petroliferien
dc.description.fulltextopenen
dc.contributor.authorChiodini, G.en
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italiaen
item.openairetypeAbstract-
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 Bologna, Bologna, Italia-
crisitem.author.orcid0000-0002-0628-8055-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.classification.parent03. Hydrosphere-
crisitem.classification.parent03. Hydrosphere-
crisitem.classification.parent04. Solid Earth-
crisitem.classification.parent04. Solid Earth-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
Appears in Collections:Conference materials
Files in This Item:
File Description SizeFormat
Chi-2009.pdf61.14 kBAdobe PDFView/Open
Show simple item record

Page view(s) 50

142
checked on Mar 27, 2024

Download(s) 50

99
checked on Mar 27, 2024

Google ScholarTM

Check