Chemical Characteristics Of The Crater Lakes Of Popocatetetl, El Chichon, And Nevado De Toluca Volcanoes, Mexico

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Journal Article: Chemical Characteristics Of The Crater Lakes Of Popocatetetl, El Chichon, And Nevado De Toluca Volcanoes, Mexico

Abstract
Three crater lakes from Mexican volcanoes were sampled and analyzed at various dates to determine their chemical characteristics. Strong differences were observed in the chemistry among the three lakes: Nevado de Toluca, considered as dormant, El Chichon at a post-eruptive stage, and Popocatepetl at a pre-eruptive stage. Not surprisingly, no influence of volcanic activity was found at the Nevado de Toluca volcano, while the other volcanoes showed a correlation between the changing level of activity and the evolution of chemical trends. Low pHs (<3.0) were measured in the water from the active volcanoes, while a pH of 5.6 was measured at the Nevado de Toluca Sun lake. Changes with time were observed at Popocatepetl and El Chichon. Concentrations of volcanic-gas derived species like Cl-, SO42- and F- decreased irregularly at El Chichon from 1983 until 1997. Major cations concentrations also diminished at El Chichon. A 100% increase in the SO42- content was measured at Popocatepetl between 1985 and 1994. An increase in the Mg/Cl ratio between 1992 (Mg/Cl=0.085) and 1994 (Mg/Cl=0.177) was observed at Popocatepetl, before the disappearance of the crater lake in 1994. It is concluded that chemical analysis of crater lakes may provide a useful additional tool for active-volcano monitoring.

Authors 
M. A. Armienta, S. De la Cruz-Reyna and J. L. MacIas








Published Journal 
Journal of Volcanology and Geothermal Research, 2000





DOI 
Not Provided
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Citation

M. A. Armienta,S. De la Cruz-Reyna,J. L. MacIas. 2000. Chemical Characteristics Of The Crater Lakes Of Popocatetetl, El Chichon, And Nevado De Toluca Volcanoes, Mexico. Journal of Volcanology and Geothermal Research. (!) .