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dc.contributor.authorSuñe-Puchol, I.es_ES
dc.contributor.authorAguirre-Díaz, Gerardoes_ES
dc.contributor.authorPedrazzi, Darioes_ES
dc.contributor.authorDávila-Harris, P.es_ES
dc.contributor.authorMiggins, D.P.es_ES
dc.contributor.authorCosta, Antonioes_ES
dc.contributor.authorOrtega-Obregón, C.es_ES
dc.contributor.authorLacan, Pierrees_ES
dc.contributor.authorGutierrez, E.es_ES
dc.contributor.authorHernandez, Walteres_ES
dc.identifier.citationJournal of Volcanology and Geothermal Research, 374: 100-119 (2019)es_ES
dc.description.abstractIlopango caldera erupted episodically at least 13 tuff-forming eruptions with a minimum estimate volume of 1–5 km 3 DRE per eruption, reaching up to 150 km 3 DRE for the first caldera-forming eruption. All tuffs are of dacitic-rhyolitic composition. The complete pyroclastic sequence spans a range in time from 1.785 to 0.0015 Ma, and based on stratigraphy and geochronology constraints can be divided into three formations: the Comalapa, Altavista and Tierras Blancas formations. In this work, we focus on the members of the newly described Altavista Formation (middle part of Ilopango caldera volcanic sequence), which consist of six consolidated pyroclastic deposits or tuffs. Each tuff corresponds to a specific eruption followed by a period of quiescence during which soil beds were developed on the deposits. The ages of the Altavista Formation ranges from 918 to 257 ka, based on new 40 Ar/ 39 Ar, U/Pb-zircon, and U/Th-zircon analyses. The tuffs of this formation show similar characteristics in mineralogy and composition. They are calcalkaline, rhyodacitic tuffs, with plagioclase, clinopyroxene, and hornblende. From field mapping and descriptions of the deposits, we have inferred the eruptive styles that include pumice fallouts, pyroclastic density currents and also hydromagmatic explosions. The common vent in all tuffs was the Ilopango caldera and each member of the Altavista Formation could correspond to a caldera collapse event, except for one of the six eruptions. The volume of each member was estimated to be >30 km 3 DRE, which is the same order of magnitude than that estimated for the Tierra Blanca Joven (TBJ) eruption at about 1,500 B. P, and smaller than those of the ignimbrites of the Comalapa Formation, the first three members of the Ilopango caldera reported previously. The tuffs of the Altavista Formation are visible up to 15–20 km away from the caldera's topographic margin. The recurrence interval of large explosive events at the Ilopango caldera was established by integrating the stratigraphic and geochronologic data of all 13 ignimbrites and pumice fallouts erupted from Ilopango caldera since the first one at 1.78 Ma to the last explosive event (TBJ). © 2019 Elsevier B.V.es_ES
dc.description.sponsorshipThis study was financed by CONACYT-CB grant 240447 to GJAD. We appreciate the logistical support of the Ministerio de Medio Ambiente y Recursos Naturales – MARN, and of the Policia Nacional Civil – PNC, of El Salvador. We thank the doctoral scholarship grant to the first author from CONACYT-Mexico.es_ES
dc.subjectCentral America Volcanic Arces_ES
dc.subjectPull-apart grabenes_ES
dc.subjectStratigraphy of pyroclastic depositses_ES
dc.titleThe Ilopango caldera complex, El Salvador: Stratigraphic revision of the complete eruptive sequence and recurrence of large explosive eruptionses_ES
dc.description.peerreviewedPeer reviewedes_ES
dc.contributor.funderConsejo Nacional de Ciencia y Tecnología (México)es_ES
oprm.item.hasRevisionno ko 0 false*
dc.contributor.orcidPedrazzi, Dario [0000-0002-6869-1325]es_ES
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