Fluid circulation and structural discontinuities inside Misti volcano (Peru) inferred from self-potential measurements

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dc.contributor.authorFinizola, Anthony
dc.contributor.authorLénat, Jean-François
dc.contributor.authorMacedo Sánchez, Orlando Efraín
dc.contributor.authorRamos Palomino, Domingo A.
dc.contributor.authorThouret, Jean-Claude
dc.contributor.authorSortino, Francesco
dc.coverage.spatialMisti, Volcán (Arequipa, Perú)
dc.date.accessioned2018-10-31T17:11:25Z
dc.date.available2018-10-31T17:11:25Z
dc.date.issued2004-08
dc.description.abstractOne of the seven potentially active andesite stratovolcanoes in southern Peru, Misti (5822 m), located 17 km northeast and 3.5 km above Arequipa, represents a major threat to the population (∼900,000 inhabitants). Our recent geophysical and geochemical research comprises an extensive self-potential (SP) data set, an audio – magnetotelluric (AMT) profile across the volcano and CO2 concentrations in the soil along a radial profile. The SP survey is the first of its kind in providing a complete mapping of a large andesitic stratovolcano 20 km in diameter. The SP mapping enables us to analyze the SP signature associated with a subduction-related active volcano. The general SP pattern of Misti is similar to that of most volcanoes with a hydrogeologic zone in the lower flanks and a hydrothermal zone in the upper central area. A quasi-systematic relationship exists between SP and elevation. Zones with constant SP/altitude gradients (Ce) are observed in both hydrogeologic (negative Ce) and hydrothermal (positive Ce) zones. Transition zones between the different Ce zones, which form a concentric pattern around the summit, have been interpreted in terms of lateral heterogeneities in the lithology. The highest amplitudes of SP anomalies seem to coincide with highly resistive zones. The hydrothermal system 6 km in diameter, which extends over an area much larger than the summit caldera, may be constrained by an older, concealed collapse caldera. A sealed zone has apparently developed through alteration in the hydrothermal system, blocking the migration of CO2 upward. Significant CO2 emanations are thus observed on the lower flanks but are absent above the hydrothermal zone.es_ES
dc.description.peer-reviewPor pareses_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationFinizola, A., Lénat, J.-F., Macedo, O., Ramos, D., Thouret, J.-C., & Sortino, F. (2004). Fluid circulation and structural discontinuities inside Misti volcano (Peru) inferred from self-potential measurements.==$Journal of Volcanology and Geothermal Research, 135,$==343-360. https://doi.org/10.1016/j.jvolgeores.2004.03.009es_ES
dc.identifier.doihttps://doi.org/10.1016/j.jvolgeores.2004.03.009es_ES
dc.identifier.govdocindex-oti2018
dc.identifier.journalJournal of Volcanology and Geothermal Researches_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/3263
dc.language.isoenges_ES
dc.publisherElsevieres_ES
dc.relation.ispartofurn:issn:0377-0273
dc.rightsinfo:eu-repo/semantics/closedAccesses_ES
dc.subjectMisti volcanoes_ES
dc.subjectSelf-potentiales_ES
dc.subjectAudio–magnetotellurices_ES
dc.subjectElectrical resistivityes_ES
dc.subjectStructural discontinuityes_ES
dc.subjectHydrothermal systemes_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.00es_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.04es_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.07es_ES
dc.titleFluid circulation and structural discontinuities inside Misti volcano (Peru) inferred from self-potential measurementses_ES
dc.typeinfo:eu-repo/semantics/articlees_ES

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