Caracteristicas hidrogeoquimicas de las aguas subterraneas profundas del macizo Hesperico

• Published in: Journal of Iberian geology p. 113
• Main Authors: Gómez, P, Turrero, M.J, Garralón, A, Peña, J, Buil, B, de la Cruz, B, Sánchez, M, Sánchez, D.M, Quejido, A, Bajos, C, Sánchez, L
• Format: Journal Article
• Language: Spanish
• Published: Universidad Complutense de Madrid 01.01.2006
• ISSN: 1698-6180; 1886-7995

One of the principal tasks to evaluate the safety of a deep repository for spent nuclear fuel in crystalline rocks is to characterize the chemical composition of the groundwater and to determine the water-rock interaction processes that control it. The present work includes a synthesis of the results on the site investigations carried out in Spain on hydrogeochemical characterization of different rock types (granite and schist) up to 500 m depth. The sites investigated are ancient uranium mines located in the Central-Iberian Zone of the Hesperian Massif: (1) El Berrocal (Toledo) is a granite pluton with a high fracture density and strong hydraulic gradients conditioned by the topography, which acts as a recharge zone; (2) Los Ratones (Cáceres) is a granite pluton that acts as a discharge zone of the surrounding mountain range; and (3) Sageras-Mina Fe (Salamanca) is a highly fractured schistose rock in which the recharge comes from the infiltration in the surrounding mountains, and the discharge occurs in the Águeda and Yeltes rivers, bordering to the S-NW and the NE to the mine, respectively.