Actividad del volcán Sabancaya (Perú) 2016-2017: observaciones petrográficas y geoquímicas de los depósitos de tefras del 2017

• Autores: Manrique Llerena, Nélida, Lazarte Zerpa, Ivonne Alejandra, Rivera Porras, Marco Antonio, Cueva Sandoval, Kevin Arnold, Japura Paredes, Saida Blanca, Aguilar Contreras, Rigoberto
• Formato: objeto de conferencia
• Fecha de Publicación: 2018
• Institución: Instituto Geológico, Minero y Metalúrgico
• Repositorio: INGEMMET-Institucional
• Lenguaje: español
• OAI Identifier: oai:repositorio.ingemmet.gob.pe:20.500.12544/1324
• Enlace del recurso: https://hdl.handle.net/20.500.12544/1324
• Nivel de acceso: acceso abierto
• Materia: Erupciones volcánicas; Ceniza volcánica; Piroclastos; Tefra; Peligros volcánicos; Volcanes; Volcán Sabancaya; Ash emission; Tephra; Hazard; Sabancaya volcano

From 2013 to present-day, the Sabancaya volcano has resumed a new eruptive episode that we have subdivided in two phases: the first phase was characterized by degassing; coincided with the occurrence of five fumarolic vents located on the north flank, and; the second, current phase that started on November 6, 2016, keeps producing ash emissions and ballistic ejecta from columns as high as 5500 m above the crater. Ash particles and ballistic blocks show homogeneous andesitic compositions (59.8-62.8 wt.% SiO2). The mineral association of juvenile rocks includes plagioclase, clinopyroxene, amphibole, biotite and Fe-Ti oxides. Disequilibrium textures have been observed in some phenocrysts, such as sieve texture and overgrowth rim in plagioclase and reaction rims in amphiboles. We attribute these characteristics to a probable recharge process involving a batch of hot mafic magma ascending into the reservoir.