CARACTERIZACIÓN DE LAS FASES ERUPTIVAS DEL VOLCÁN COPAHUE DURANTE EL CICLO 2012-2017 (ANDES ARGENTINO-CHILENO)

BARION G.; DAGA R.; ALBITE J.M.; SOMMER C.; BAEZ A.; - CASELLI, A.T.

Tucuman

Congreso; XX Congreso Geológico Argentino; 2017

Asociación Geológica Argentina

This work describes the main characteristics of the activity and composition of the products emitted during the 2012-17 eruption cycle of Copahue volcano (37º45'S - 71º10.2'O, 2977 meters). Four phases were recognized in the present eruptive cycle where the crater lake begins to recover due to possibly a seal effect on the hydrothermal system due to decreased activity. The Volcanic Explosivity Index (VEI: Newhall and Self Volcanic Explosive Index, 1982) never exceeded the value of 2. The chemical composition of the bombs emitted in the second, third and fourth eruptive phases were analyzed together with the bombs of the year 2000 eruption and postglacial lavas. They maintain a constant composition corresponding to traquiandesite basaltic - andesite basaltic, indicating a constant composition with little evolution, in the magmatic chamber.