Abstract:
Copahue volcano has a record of historical eruptions of low intensity which have mainly been characterized from the events observed in last decades. Significant changes in several parameters associated with the volcano activity were observed since the end of 2011. After 12 years of quiescence, on July 2012, the volcano started a new eruptive period. In this work, the characterization of the pyroclastic products emitted on 19th July 2012 is presented. Although the limited dispersion of the event, its study is central in the definition of the character of the initial phase of the eruptive cycle. A high proportion of lithics and the presence of juvenile first-cycled vitroclasts studied in detail allow us to characterize the eruptive mechanism, consistent with a phreatomagmatic eruption. A distinctive feature of the tephra is the presence of pyroclastic sulfur. Although these kinds of particles have been identified in previous eruptions, its presence is crucial revealing the existence of molten sulfur under the crater lake. The participation of this precipitated material allow us to infer its influence in the eruptive mechanism. © 2017, Asociacion Geologica Argentina. All rights reserved.
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Documento: |
Artículo
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Título: | Tephras emitted during the initial hydromagmatic phase (July 2012) of the 2012-2016 eruptive cycle of the copahue volcano (andes del sur) |
Autor: | Daga, R.; Caselli, A.; Ribeiro Guevara, S.; Agusto, M. |
Filiación: | Laboratorio de Análisis por Activación Neutrónica, Centro Atómico Bariloche, Comisión Nacional de Energía Atómica, Bariloche, Argentina Centro Científico Tecnológico, CONICET, Patagonia Norte, Argentina Laboratorio de Estudio y Seguimiento de Volcanes Activos, Instituto de Investigación en Paleobiología y Geología, Universidad Nacional de Río Negro, Argentina Grupo de Estudio y Seguimiento de Volcanes Activos, Instituto de Estudios Andinos Don Pablo Groeber, Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, CONICET, Argentina
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Palabras clave: | Hydromagmatic eruption; Pyroclastic products; Pyroclastic sulfur; Southern Volcanic Zone; phreatomagmatism; pyroclastic deposit; pyroclastic flow; sulfur; tephra; volcanic eruption; volcanology; Copahue; Neuquen; Southern Volcanic Zone |
Año: | 2017
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Volumen: | 74
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Número: | 2
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Página de inicio: | 191
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Página de fin: | 206
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Título revista: | Revista de la Asociacion Geologica Argentina
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Título revista abreviado: | Rev. Asoc. Geol. Argent.
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ISSN: | 00044822
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Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v74_n2_p191_Daga |
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Citas:
---------- APA ----------
Daga, R., Caselli, A., Ribeiro Guevara, S. & Agusto, M.
(2017)
. Tephras emitted during the initial hydromagmatic phase (July 2012) of the 2012-2016 eruptive cycle of the copahue volcano (andes del sur) . Revista de la Asociacion Geologica Argentina, 74(2), 191-206.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v74_n2_p191_Daga [ ]
---------- CHICAGO ----------
Daga, R., Caselli, A., Ribeiro Guevara, S., Agusto, M.
"Tephras emitted during the initial hydromagmatic phase (July 2012) of the 2012-2016 eruptive cycle of the copahue volcano (andes del sur) "
. Revista de la Asociacion Geologica Argentina 74, no. 2
(2017) : 191-206.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v74_n2_p191_Daga [ ]
---------- MLA ----------
Daga, R., Caselli, A., Ribeiro Guevara, S., Agusto, M.
"Tephras emitted during the initial hydromagmatic phase (July 2012) of the 2012-2016 eruptive cycle of the copahue volcano (andes del sur) "
. Revista de la Asociacion Geologica Argentina, vol. 74, no. 2, 2017, pp. 191-206.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v74_n2_p191_Daga [ ]
---------- VANCOUVER ----------
Daga, R., Caselli, A., Ribeiro Guevara, S., Agusto, M. Tephras emitted during the initial hydromagmatic phase (July 2012) of the 2012-2016 eruptive cycle of the copahue volcano (andes del sur) . Rev. Asoc. Geol. Argent. 2017;74(2):191-206.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v74_n2_p191_Daga [ ]