Probing the hidden magmatic evolution of El Misti volcano (Peru) with the Pb isotope composition of fumaroles

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dc.contributor.authorVlastelic, Ivan
dc.contributor.authorApaza, Fredy
dc.contributor.authorMasias, Pablo
dc.contributor.authorRivera, Marco
dc.contributor.authorPiro, Jean‐Luc
dc.contributor.authorGannoun, Abdelmouhcine
dc.coverage.spatialPerú
dc.date.accessioned2022-01-31T16:31:39Z
dc.date.available2022-01-31T16:31:39Z
dc.date.issued2022-01-20
dc.description.abstractThis work proposes a new method to probe the hidden magmatic evolution of quiescent Andean volcanoes from the Pb isotope composition of gases. The method is based on an assimilation-fractional crystallisation-degassing model linking the Pb isotope composition of gases with the SiO₂ content of their magmatic source. The model is applied to El Misti volcano that threatens Arequipa, the second most densely populated city of Peru. Gas condensates and Pb-rich solid deposits (PbS, PbCl₂, PbSO₄) collected in 2018 in the bottom of El Misti crater at 260–150°C fumarole vents were used to reconstruct the mean composition of degassing magmas (60.8-61.8 wt% SiO₂). These compositions are slightly more evolved than the lavas from the last AD 1440–1470 eruption, suggesting either the secular differentiation of the main magma reservoir, or the contribution of more evolved magmas to volcanic gases. On the other hand, the slight but significant difference between the instantaneous composition recorded in gas condensates and the time-integrated composition recorded in solid deposits points to the degassing of less evolved magmas over the last decades. This trend is ascribed to a recent recharge of El Misti reservoir with hot mafic magmas, in agreement with the evolution of fumarolic deposit mineralogy in the last half a century. The Pb isotope composition of gas appears to be a promising tool for probing the hidden magmatic evolution of quiescent volcanoes where assimilation-fractional crystallisation operates.es_ES
dc.description.peer-reviewPor pareses_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationVlastelic, I., Apaza, F., Masias, P., Rivera, M., Piro, J. L., & Gannoun, A. (2022). Probing the hidden magmatic evolution of El Misti volcano (Peru) with the Pb isotope composition of fumaroles.==$Bulletin of Volcanology, 84$==(17), 1-12. https://doi.org/10.1007/s00445-021-01521-9es_ES
dc.identifier.doihttps://doi.org/10.1007/s00445-021-01521-9es_ES
dc.identifier.govdocindex-oti2018
dc.identifier.journalBulletin of Volcanologyes_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/5076
dc.language.isoenges_ES
dc.publisherSpringeres_ES
dc.relation.ispartofurn:issn:0258-8900
dc.rightsinfo:eu-repo/semantics/closedAccesses_ES
dc.subjectEl Misti volcanoes_ES
dc.subjectAssimilation-fractional crystallisationes_ES
dc.subjectMagmatic gaseses_ES
dc.subjectFumaroleses_ES
dc.subjectSublimateses_ES
dc.subjectPb isotopeses_ES
dc.subjectVolcanic activityes_ES
dc.subjectVolcanic monitoringes_ES
dc.subjectRiskes_ES
dc.subject.ocdehttps://purl.org/pe-repo/ocde/ford#1.05.07es_ES
dc.subject.ocdehttps://purl.org/pe-repo/ocde/ford#1.05.04es_ES
dc.titleProbing the hidden magmatic evolution of El Misti volcano (Peru) with the Pb isotope composition of fumaroleses_ES
dc.typeinfo:eu-repo/semantics/articlees_ES

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