Artículo
The crater lake of Copahue volcano (Argentina): Geochemical and thermal changes between 1995 and 2015
Agusto, Mariano Roberto
; Caselli, Alberto Tomás
; Daga, Romina Betiana
; Varekamp, Johan; Trinelli, María Alcira
; Dos Santos Afonso, María; Velez, María Laura; Euillades, Pablo Andrés
; Guevara, Sergio Ribeiro
Fecha de publicación:
12/2016
Editorial:
Geological Society Publications House
Revista:
Geological Society of London Special Publication
ISSN:
0305-8719
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The crater lake and associated hydrothermal features of Copahue volcano have been studied intensively over the last 20 years (1995-2015). The geochemical and isotopic compositions of the waters provide insights into the processes occurring in the volcanic-hydrothermal system, the crater lake and the thermal springs. Variations in the temperature and chemical composition of the waters reveal fundamental changes in the system that precede and accompany the magmatic and phreatic eruptive events at Copahue. A conceptual model of the summit system was developed involving the intrusion of slivers of magma in the hot acidic hydrothermal cell, the saturation of waters with secondary minerals leading to reduced permeability, the blocking of fluid pathways by liquid sulphur during heating events and the transport of gas from the magma through the ductile-brittle transition into the hydrothermal system. Geophysical data were integrated with the chemical data to provide new insights into the behaviour of the deep magmatic system that feeds the volcano edifice. Multidisciplinary studies were used to identify precursory signals of eruptive activity to give an early warning of pending volcanic hazards. Several geochemical ratios in river water were identified as potential indicators of upcoming volcanic activity, which could be used in co-operation with the community and local authorities to deal with these volcanic hazards.
Palabras clave:
CRATER LAKE
,
COPAHUE
,
HYDROTHERMAL COMPOSITION
,
ACIDIC LAKE
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Identificadores
Colecciones
Articulos(CCT - MENDOZA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - MENDOZA
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - MENDOZA
Citación
Agusto, Mariano Roberto; Caselli, Alberto Tomás; Daga, Romina Betiana; Varekamp, Johan; Trinelli, María Alcira; et al.; The crater lake of Copahue volcano (Argentina): Geochemical and thermal changes between 1995 and 2015; Geological Society Publications House; Geological Society of London Special Publication; 437; 1; 12-2016; 107-130
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