Linking magmatic processes and magma chemistry during the post-glacial to recent explosive eruptions of Ubinas volcano (southern Peru)

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dc.contributor.authorSamaniego, Pablo
dc.contributor.authorRivera, Marco
dc.contributor.authorManrique, Nélida
dc.contributor.authorSchiavi, Federica
dc.contributor.authorNauret, François
dc.contributor.authorLiorzou, Céline
dc.contributor.authorAncellin, Marie- Anne
dc.coverage.spatialUbinas, Volcán (Moquegua, Perú)
dc.date.accessioned2020-11-23T15:11:34Z
dc.date.available2020-11-23T15:11:34Z
dc.date.issued2020-12-01
dc.description.abstractUnderstanding the links between the magma differentiation processes, the magma plumbing system and the magma composition at arc volcanoes is of paramount importance for volcanic hazard assessment. In this work we focus on the post-glacial, Holocene, historical, and recent eruption products of Ubinas volcano (Peru), which display an overall decrease in silica content from the older, plinian (VEI 3–5), rhyolitic eruptions (69–71 wt% SiO₂) to the historical and recent (2006–2009, 2013–2017), vulcanian (VEI 1–2) basaltic andesitic eruptions (55–57 wt% SiO₂). Based on a comprehensive study of the major and trace elements and the Sr-Nd-Pb isotopes, we conclude that this temporal pattern reflects the evolution of the Ubinas magmas in the middle-to-upper crust by a coupled Assimilation-Fractional Crystallization (AFC) process involving a cumulate composed of plagioclase, amphibole, clinopyroxene, orthopyroxene and Fe–Ti oxides, with minor amounts of olivine and biotite at the mafic and felsic end-members, respectively. Upper crustal assimilation is limited to 5–8 vol%, but the overall radiogenic Sr-Nd-Pb signature of the Ubinas magmas requires a larger crustal component, which must therefore occur at middle to lower crustal depths. The petrology of the Ubinas magmas also points to an overall increase in P-T conditions: the large Holocene dacitic and rhyolitic eruptions record temperatures ranging from 800 to 850 °C and pressures in the range of 200–400 MPa, whereas the historical and recent (2006–2009, 2013–2017) basaltic andesitic eruptions provide higher temperatures and pressures (1000 °C, >300–400 MPa). Overall, the thermo-barometry, phase equilibrium and geochemical constraints allow us to propose the existence of a middle-to-upper crust magma column composed of a highly crystalline magma mush containing batches of liquid magma, which seems to be continually recharged from deeper levels. On the basis of the petrological nature of the historical basaltic andesitic eruptions (1667 CE, 2006–2009, 2013–2017), we postulate that during the last centuries, Ubinas experienced a recharge-dominated process, with no evidence for a rejuvenation of the silica-rich reservoir that fed the large Holocene dacitic to rhyolitic eruptions. This study highlights the importance of detailed petrological studies of Holocene sequences at explosive arc volcanoes in order to constrain the magmatic processes and conditions that control large explosive eruptions.es_ES
dc.description.peer-reviewPor pareses_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationSamaniego, P., Rivera, M., Manrique, N., Schiavi, F., Nauret, F., Liorzou, C. & Ancellin, M.-A. (2020). Linking magmatic processes and magma chemistry during the post-glacial to recent explosive eruptions of Ubinas volcano (southern Peru).==$Journal of Volcanology and Geothermal Research, 407,$==107095. https://doi.org/10.1016/j.jvolgeores.2020.107095es_ES
dc.identifier.doihttps://doi.org/10.1016/j.jvolgeores.2020.107095es_ES
dc.identifier.govdocindex-oti2018
dc.identifier.journalJournal of Volcanology and Geothermal Researches_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/4883
dc.language.isoenges_ES
dc.publisherElsevieres_ES
dc.relation.ispartofurn:issn:0377-0273
dc.rightsinfo:eu-repo/semantics/closedAccesses_ES
dc.subjectUbinases_ES
dc.subjectPerúes_ES
dc.subjectArc volcanoeses_ES
dc.subjectRechargees_ES
dc.subjectThermobarometryes_ES
dc.subjectMagma plumbing systemes_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.07es_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.00es_ES
dc.titleLinking magmatic processes and magma chemistry during the post-glacial to recent explosive eruptions of Ubinas volcano (southern Peru)es_ES
dc.typeinfo:eu-repo/semantics/articlees_ES

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