Preliminary assessment of the geothermal potential of Rosario de la Frontera area (Salta, NW Argentina): insight from hydro-geological, hydro-geochemical and structural investigations

INVERNIZZI CHIARA; PIERANTONI PIETRO PAOLO; CHIODI AGOSTINA; MAFFUCCI ROBERTA; CORRADO SVEVA; BAEZ WALTER; TASSI FRANCO; GIORDANO GUIDO; VIRAMONTE JOSÉ GERMÁN

JOURNAL OF SOUTH AMERICAN EARTH SCIENCES

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2014 vol. 54 p. 20 - 36

0895-9811

This work is part of a project aimed to the development and application of hydrogeological, hydrogeochemical and geological methodologies for the study of the geothermal system of Rosario de La Frontera (NW Argentina). The surface thermal manifestations of this area, whose temperatures range from 22.6 to 92.6 ºC, are mainly located in the northern sector of Sierra de la Candelaria anticline. This regional structure crops out between the provinces of Salta and Tucuman (NWArgentina), at the foothills of the central Andean retrowedge. The present investigation focuses on hydrogeological and structural data, and isotopic compositions (18O, D and 3H) of thermal springs. Preliminary results allowed to define: i) the meteoric origin of spring water and their long (more than 50 years residence time at depth, ii) a positive water balance, ranging between 2 and 4 millions of m3/yr,and iii) a conservative geothermal reservoir volume of about 39 km3, iv) a geothermal potential with Er = 5.6*1018 J and Ef = 0.8*1018 J.