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dc.contributor.author Samaniego, Pablo
dc.contributor.author Rivera, Marco
dc.contributor.author Manrique, Nélida
dc.contributor.author Schiavi, Federica
dc.contributor.author Nauret, François
dc.contributor.author Liorzou, Céline
dc.contributor.author Ancellin, Marie- Anne
dc.coverage.spatial Ubinas, Volcán (Moquegua, Perú)
dc.date.accessioned 2020-11-23T15:11:34Z
dc.date.available 2020-11-23T15:11:34Z
dc.date.issued 2020-12-01
dc.identifier.citation Samaniego, 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.2020.107095 es_ES
dc.identifier.govdoc index-oti2018
dc.identifier.uri http://hdl.handle.net/20.500.12816/4883
dc.description.abstract Understanding 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.format application/pdf es_ES
dc.language.iso eng es_ES
dc.publisher Elsevier es_ES
dc.relation.ispartof urn:issn:0377-0273
dc.rights info:eu-repo/semantics/closedAccess es_ES
dc.subject Ubinas es_ES
dc.subject Perú es_ES
dc.subject Arc volcanoes es_ES
dc.subject Recharge es_ES
dc.subject Thermobarometry es_ES
dc.subject Magma plumbing system es_ES
dc.title Linking magmatic processes and magma chemistry during the post-glacial to recent explosive eruptions of Ubinas volcano (southern Peru) es_ES
dc.type info:eu-repo/semantics/article es_ES
dc.subject.ocde http://purl.org/pe-repo/ocde/ford#1.05.07 es_ES
dc.subject.ocde http://purl.org/pe-repo/ocde/ford#1.05.00 es_ES
dc.identifier.journal Journal of Volcanology and Geothermal Research es_ES
dc.description.peer-review Por pares es_ES
dc.identifier.doi https://doi.org/10.1016/j.jvolgeores.2020.107095 es_ES

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