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Volcán Mentolat

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Volcán Mentolat Volcán Mentolat Región: Aysén Provincia: Aysén Comuna: Puerto Cisnes Coordenadas: 44°42’S – 73°05’O Poblados más cercanos: Puerto Cisnes – Puerto Gaviota – Puerto Gala Tipo: Estratovolcán Altura: 1605 m s.n.m. Diámetro basal: 10 km 2 Área basal: 78,5 km Vista del volcán Mentolat (Isla Magdalena) desde el oeste Volumen estimado: 36,6 km3 (Fotografía: Stefan Kraus, SERNAGEOMIN) Última actividad: Última erupción mayor: ~ 1850 Ranking de riesgo 48 (moderado-bajo) específico: Generalidades El volcán Mentolat es un estratovolcán ubicado en la Isla Magdalena, región de Aysén. En esta isla, al oeste del volcán, están los caseríos de Puerto Gala y Puerto Gaviota; la localidad de Puerto Cisnes dista 31 kilómetros al este del volcán. La composición química de los productos volcánicos cubre un amplio rango entre andesitas basálticas y dacitas. Registro eruptivo Los antecedentes geológicos de este volcán son escasos. Estudios recientes muestran la ocurrencia de una erupción importante hace cerca de 6.960 años. Por otra parte, Mella et al. (2012) han reportado una erupción mayor fechada entre 3.890±30 y 2.510±30 AP y otra menor probablemente prehistórica. Algunos reportes históricos sugieren una erupción al comienzo del siglo XVIII que podrían estar asociados a lavas recientes reconocibles en uno de sus flancos. Peligros y Riesgos Asociados Aun cuando no existe un registro nutrido de actividad reciente, el volcán Mentolat ha generado erupciones explosivas que definen a la dispersión y acumulación de piroclastos como el principal peligro amenazando las localidades situadas al oriente. Mapa de ubicación de Volcán Mentolat REFERENCIAS Carel M., Siani G. & Delpech G. (2011): Tephrostratigraphy of a deep-sea sediment sequence off the south Chilean margin: New insight into the Hudson volcanic activity since the last glacial period. Journal of Volcanology and Geothermal Research, 208: 99-111. Gallego A., Russo R.M., Comte D., Mocanu V.I., Murdie R.E. & Vandecar J.C. (2010): Seismic noise tomography in the Chile ridge subduction region. Geophysical Journal International, 182: 1478-1492. López-Escobar L., Kilian R., Kempton P.D. & Tagiri M. (1993): Petrography and geochemistry of Quaternary rocks from the Southern Volcanic Zone of the Andes between 41º30’ and 46º00’ S, Chile. Revista Geológica de Chile, 20 (1): 33-55. Mella M., Ramos A., Kraus S. & Duhart P. (2012): Datos tefroestratigráficos de erupciones Holocenas del Volcán Mentolat, Andes del Sur (44º40’ S), Chile. Resumenes Expandidos, XIII Congreso Geológico Chileno. Antofagasta, Chile, August 2012. Naranjo J.A. & Stern C.R. (2004): Holocene tephrochronology of the southernmost part (42º30’ – 45º S) of the Andean Southern Volcanic Zone. Revista Geológica de Chile, 31 (2): 225-240. Información Cartográfica: Kraus, S., 2012. Mapa Preliminar de peligros volcánicos Volcán Mentolat. Región de Aysén del General Carlos Ibáñez del Campo. Informe inédito, Subdirección Nacional de Geología. Programa de Riesgo Volcánico. Escala 1:100.000 .
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