DESGASIFICACIÓN DIFUSA DE DIÓXIDO DE CARBONO EN EL COMPLEJO VOLCÁNICO COPAHUE ? CAVIAHUE, NEUQUÉN, ARGENTINA

LAMBERTI M.; CHIODINI G.; CARDELLINI C; AGUSTO M; - CASELLI, A.T.

Tucuman

Congreso; XX Congreso Geológico Argentino; 2017

Asociación Geológica Argentina

Active volcanoes and their geothermal areas associated emit large amount of gases into the atmosphere, not only through crater plumes or fumaroles, but also through imperceptible manifestations through the soils denominated diffuse degassing. The Copahue ? Caviahue Volcanic Complex (CVCC, 38°S-71°O) in the South Volcanic Zone (Ramos y Folguera 2000, Bermúdez et al. 2002, Melnick et al. 2006, Rojas Vera et al. 2010). It hosts four hydrothermal areas in Argentinean territory, known as the Copahue town, Las Máquinas, Las Maquinitas and Anfiteatro. During three campaigns carried out between 2014 and 2016, 1,820 measurements of CO2 soil flux were acquired. Four log-normal populations were defined field by means of the Graphical Statistical Approach: some of them are characterized by low fluxes, representative of background values in vegetated and non-vegetated areas and another population, characterized by a high CO2, is representative of hydrothermal-volcanic CO2 degassing. By means of the Sequential Gaussian Simulation, well-defined diffuse degassing structures were noticed in most of the investigated sites, which seem to be controlled by tectonic features. The total CO2 released from the hydrothermal ? volcanic source at the Copahue geothermal field is 208,5 ± 11,6 t d-1.