SciELO - Scientific Electronic Library Online

 
vol.33 número2Evolución tectonotermal ordovícica del borde occidental del arco magmático Famatiniano: metamorfismo de las rocas máficas y ultramáficas de la Sierra de la Huerta de Las Imanas (Sierras Pampeanas, Argentina)Pingüinos fósiles (Pygoscelis calderensis sp. nov.) en la Formación Bahía Inglesa (Mioceno Medio-Plioceno), Chile índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Revista geológica de Chile

versión impresa ISSN 0716-0208

Resumen

HERRERA, Christian; PUEYO, Juan José; SAEZ, Alberto  y  VALERO-GARCES, Blas L. Relation of surface and underground waters in Chungará and Cotacotani lake districts, northern Chile: an isotopic study. Rev. geol. Chile [online]. 2006, vol.33, n.2, pp. 299-325. ISSN 0716-0208.  http://dx.doi.org/10.4067/S0716-02082006000200005.

Lake Chungará and Cotacotani lake districts are surface water bodies located to the northwest of Lauca Basin in the northern Chilean Altiplano. Surface and underground waters show low to moderate saline content and an electrical conductivity in the range of 48.7 to 3090 μS/cm. The lakes are related to a system of aquifers on the nearby volcano flanks and debris avalanche deposits of Parinacota volcano. On the basis of δ18O and δD isotopic composition and its correlation with the chloride content in Chungará and Cotacotani lake, spring, and Chungará river waters it is demonstrated that: a. Lake Chungará's waters show vertical and horizontal homogeneous isotopic composition, which indicates a good mixture of waters in the lake; b. an important part of the Cotacotani lake recharge feeding come from Lake Chungará, that flows laterally as groundwater; c. the groundwater that feeds the springs of the area has its main recharge in the spring-summer (October-March) precipitation. The high content of tritium (3H) measured in spring waters of the area suggested a very recent recharge (last decades) of the aquifer system. The application of lumped parameter models to interpret the water residence time in the aquifer indicates that the piston flow model shows the best fit to the isotopic composition of Chungará-Cotacotani groundwater

Palabras clave : Lake Chungará ; Cotacotani Lakes; Groundwater; Recharge; Stable Isotopes; Tritium; Chile.

        · resumen en Español     · texto en Español