The crater lake of Copahue volcano (Argentina): Geochemical and thermal changes between 1995 and 2015

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...

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Autores principales: Agusto, Mariano Roberto, Caselli, Alberto T., Trinelli, María Alcira, Velez, Maria Laura
Publicado: 2017
Materias:
crater lake
geochemistry
hydrothermal system
isotopic composition
magma
secondary mineral
temperature effect
Copahue
Neuquen
Southern Volcanic Zone
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03058719_v437_n1_p107_Agusto
http://hdl.handle.net/20.500.12110/paper_03058719_v437_n1_p107_Agusto
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_03058719_v437_n1_p107_Agusto
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spelling paper:paper_03058719_v437_n1_p107_Agusto2023-06-08T15:31:01Z The crater lake of Copahue volcano (Argentina): Geochemical and thermal changes between 1995 and 2015 Agusto, Mariano Roberto Caselli, Alberto T. Trinelli, María Alcira Velez, Maria Laura crater lake geochemistry hydrothermal system isotopic composition magma secondary mineral temperature effect Copahue Neuquen Southern Volcanic Zone 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. © 2017 The Author(s). Fil:Agusto, M.R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Caselli, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Trinelli, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Velez, M.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2017 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03058719_v437_n1_p107_Agusto http://hdl.handle.net/20.500.12110/paper_03058719_v437_n1_p107_Agusto
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic crater lake
geochemistry
hydrothermal system
isotopic composition
magma
secondary mineral
temperature effect
Copahue
Neuquen
Southern Volcanic Zone
spellingShingle crater lake
geochemistry
hydrothermal system
isotopic composition
magma
secondary mineral
temperature effect
Copahue
Neuquen
Southern Volcanic Zone
Agusto, Mariano Roberto
Caselli, Alberto T.
Trinelli, María Alcira
Velez, Maria Laura
The crater lake of Copahue volcano (Argentina): Geochemical and thermal changes between 1995 and 2015
topic_facet crater lake
geochemistry
hydrothermal system
isotopic composition
magma
secondary mineral
temperature effect
Copahue
Neuquen
Southern Volcanic Zone
description 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. © 2017 The Author(s).
author Agusto, Mariano Roberto
Caselli, Alberto T.
Trinelli, María Alcira
Velez, Maria Laura
author_facet Agusto, Mariano Roberto
Caselli, Alberto T.
Trinelli, María Alcira
Velez, Maria Laura
author_sort Agusto, Mariano Roberto
title The crater lake of Copahue volcano (Argentina): Geochemical and thermal changes between 1995 and 2015
title_short The crater lake of Copahue volcano (Argentina): Geochemical and thermal changes between 1995 and 2015
title_full The crater lake of Copahue volcano (Argentina): Geochemical and thermal changes between 1995 and 2015
title_fullStr The crater lake of Copahue volcano (Argentina): Geochemical and thermal changes between 1995 and 2015
title_full_unstemmed The crater lake of Copahue volcano (Argentina): Geochemical and thermal changes between 1995 and 2015
title_sort crater lake of copahue volcano (argentina): geochemical and thermal changes between 1995 and 2015
publishDate 2017
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03058719_v437_n1_p107_Agusto
http://hdl.handle.net/20.500.12110/paper_03058719_v437_n1_p107_Agusto
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