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Geochemical characterization of thermal waters in the Borateras Geothermal Zone, Peru
Water-Rock Interaction, 13, 2010
The Borateras Geothermal Zone (BGZ) is located in the Western Cordillera of the Andes in southern Peru. In Borateras volcanic chains which are NW-SE aligned, volcanic rocks have been deposited over sedimentary Cretaceous basement. The geochemical interpretation of the results using Langelier and Pipper diagrams show us that thermal waters are alkaline-chloride water type. The triangular diagram shows that most of geothermal waters plot close to the chloride corner which is typical of mature geothermal deep fluids. High B concentrations lead to a relatively high B/Cl ratio as shown on a B-Cl binary diagram. This can be used to elucidate the reactions of waters with sedimentary marine rocks at deep levels. The G18O vs GD diagram shows a relatively high temperature or poor permeability. The results for chemical geothermometry allowed us to estimate the temperature at the depth of the geothermal resources to be as high as 200°C.
CRC Press
Cruz, V. & Matsuda, K. (2010) - Geochemical characterization of thermal waters in the Borateras Geothermal zone, Peru. En: Birkle, P.; Torres, Ignacio S., eds., Water-rock interaction : Proceedings of the 13th International Conference on Water-Rock Interaction, WRI-13, Guanajuato, Mexico, 16-20 August 2010. Boca Raton, Fl: CRC Press, 157-160.
pp. 157-160

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