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dc.contributor.authorBáez, Alejandro David-
dc.contributor.authorBáez, Walter-
dc.contributor.authorCaselli, Alberto Tomás-
dc.contributor.authorDaga, Romina Betiana-
dc.contributor.authorSommer, Carlos Augusto-
dc.date.accessioned2022-03-03T13:34:59Z-
dc.date.available2022-03-03T13:34:59Z-
dc.date.issued2021-
dc.identifier.citationBáez A.D., Báez W., Caselli A.T, Daga R., Sommer C.A., (2021). A reinterpretation of pyroclastic density current deposits at Copahue volcano, Andean Southern Volcanic Zone, Argentina-Chile. Journal of South American Earth Sciences 111; 103479. https://doi.org/10.1016/j.jsames.2021.103479es_ES
dc.identifier.issn0895-9811es_ES
dc.identifier.otherhttps://www.sciencedirect.com/science/article/pii/S0895981121003266?via%3Dihubes_ES
dc.identifier.urihttp://rid.unrn.edu.ar/handle/20.500.12049/8402-
dc.description.abstractPyroclastic density currents (PDCs) are one of the most dangerous volcanic phenomena. The correct interpretation and mapping of PDC deposits in the volcano record is important to establish the eruptive style and play a fundamental role in hazard assessment and risk management. The Copahue volcano is an active intermediate volcano of the Southern Volcanic Zone of the Andes (Argentina-Chile) that presents fragmentary evidence of explosive activity during its evolution, with unusual minor PDC deposits. The recorded historic eruptions were mainly phreatomagmatic due to the presence of a crater lake. In this study, four key deposits previously interpreted as PDC products corresponding to different stages of the Copahue volcano evolution (Pleistocene, Holocene, and Historic times) are analyzed and this origin is discussed: (i) A Pleistocene reddish succession located in the northeast flank of the volcano formed by stretched bombs in a coherent lava is interpreted as clastogenic lavas; (ii) a series of proximal bedded volcaniclastics deposits of Pleistocene age are interpreted as redeposition of hyaloclastic fragments from syn-eruptive subglacial meltwater flows associated with subglacial eruptions; (iii) a distal Holocene deposit located ~12 km east of the active crater consist mainly in fine-sized clasts forming aggregates is reinterpreted as a sedimentary (lacustrine) deposit with volcaniclastic input; and, (iv) a historic whitish-grey clastic deposit located on the eastern flank is considered a product of a mixed avalanche generated during the 1992–1995 activity. Consequently, the PDC occurrence during the Copahue volcano evolution is less than previously thought. Large PDCs are unlikely in the future and their influence area would be reduced near the active crater as observed in recent eruptions. Flows triggered by the melting of snow/ice during volcanic activity and sudden drainage of the crater lake appear to be a more likely potential hazard that should be considered during risk assessment.es_ES
dc.format.extentp. 103479es_ES
dc.language.isoenes_ES
dc.publisherElSevieres_ES
dc.relation.urihttps://www.sciencedirect.com/journal/journal-of-south-american-earth-scienceses_ES
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/4.0/-
dc.titleA reinterpretation of pyroclastic density current deposits at Copahue volcano, Andean Southern Volcanic Zone, Argentina-Chilees_ES
dc.typeArticuloes_ES
dc.rights.licenseCreative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)-
dc.description.filiationFil: Báez, Alejandro. Universidad Nacional de Río Negro, Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.es_ES
dc.description.filiationFil: Báez, Walter. IBIGEO (Universidad Nacional de Salta-CONICET). Argentina.es_ES
dc.description.filiationFil: Caselli, Alberto. Universidad Nacional de Río Negro, Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.es_ES
dc.description.filiationFil: Daga, Romina. Laboratorio de Análisis por Activación Neutrónica, Centro Atómico Bariloche, Comisión Nacional de Energía Atómica. Centro Científico Tecnológico, CONICET, Patagonia Norte. Argentina.es_ES
dc.description.filiationFil: Sommer, Carlos. Universidade Federal do Rio Grande do Sul (UFRGS). Brasil.es_ES
dc.subject.keywordCaviahue-Copahue Volcanic Complexes_ES
dc.subject.keywordGlaciovolcanismes_ES
dc.subject.keywordMixed Avalancheses_ES
dc.subject.keywordClastogenic Lavases_ES
dc.subject.keywordVolcanic Hazardses_ES
dc.type.versioninfo:eu-repo/semantics/publishedVersiones_ES
dc.subject.materiaCiencias Exactas y Naturaleses_ES
dc.origin.lugarDesarrolloUniversidad Nacional de Río Negro. Instituto de Investigación en Paleobiología y Geología.es_ES
dc.relation.journalissue111es_ES
dc.description.reviewtruees_ES
dc.description.resumenPyroclastic density currents (PDCs) are one of the most dangerous volcanic phenomena. The correct interpretation and mapping of PDC deposits in the volcano record is important to establish the eruptive style and play a fundamental role in hazard assessment and risk management. The Copahue volcano is an active intermediate volcano of the Southern Volcanic Zone of the Andes (Argentina-Chile) that presents fragmentary evidence of explosive activity during its evolution, with unusual minor PDC deposits. The recorded historic eruptions were mainly phreatomagmatic due to the presence of a crater lake. In this study, four key deposits previously interpreted as PDC products corresponding to different stages of the Copahue volcano evolution (Pleistocene, Holocene, and Historic times) are analyzed and this origin is discussed: (i) A Pleistocene reddish succession located in the northeast flank of the volcano formed by stretched bombs in a coherent lava is interpreted as clastogenic lavas; (ii) a series of proximal bedded volcaniclastics deposits of Pleistocene age are interpreted as redeposition of hyaloclastic fragments from syn-eruptive subglacial meltwater flows associated with subglacial eruptions; (iii) a distal Holocene deposit located ~12 km east of the active crater consist mainly in fine-sized clasts forming aggregates is reinterpreted as a sedimentary (lacustrine) deposit with volcaniclastic input; and, (iv) a historic whitish-grey clastic deposit located on the eastern flank is considered a product of a mixed avalanche generated during the 1992–1995 activity. Consequently, the PDC occurrence during the Copahue volcano evolution is less than previously thought. Large PDCs are unlikely in the future and their influence area would be reduced near the active crater as observed in recent eruptions. Flows triggered by the melting of snow/ice during volcanic activity and sudden drainage of the crater lake appear to be a more likely potential hazard that should be considered during risk assessment.es_ES
dc.identifier.doihttps://doi.org/10.1016/j.jsames.2021.103479-
dc.relation.journalTitleJournal of South American Earth Scienceses_ES
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