Abstract

GAVIRIA REYES, María A et al. Estudio hidrogeoquímico de las áreas termales del complejo volcánico Copahue-Caviahue. Rev. Asoc. Geol. Argent. [online]. 2016, vol.73, n.2, pp.256-269. ISSN 0004-4822.

The hydrothermal system hosted in the Copahue- Caviahue volcanic Complex consists of different geothermal areas around the Copahue volcano, whose last eruptive cycle started on December 22 of 2012. This work presents new data from the samplings of November 2012 and march 2013 in Las Maquinas, Las Maquinitas, villa de Copahue and Chancho-Có areas. These acid-sulfate and steam heated waters, presented changes in their SO4-2 concentrations, especially in Las Maquinas and Las Maquinitas areas. Meanwhile, SO4-2/Cl- ratios presented a strong decrease in the samples from November 2012, regarding the samples from 2013. These values were corrected by the seasonal effect, and the observed differences remained. Rare Earth elements compositions on waters from these hotsprings are also presented.

Keywords : Copahue volcano; Hydrothermal system; Water geochemistry; REE; Volcano risk.

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