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01-12-2009 | Original Article | Issue 4/2009

Environmental Earth Sciences 4/2009

Hydrogeological characterization of carbonated Jurassic aquifers in the Gijón-Villaviciosa basin (Asturias, N Spain) by means of geochemical and isotopic techniques

Journal:
Environmental Earth Sciences > Issue 4/2009
Authors:
Beatriz González-Fernández, Mónica Meléndez-Asensio, Eduardo Menéndez-Casares

Abstract

Chemical and isotopic analyses of groundwater from the carbonated Jurassic aquifers in the Gijón-Villaviciosa basin (Asturias, northern Spain) were carried out. Nine springs were sampled to determine major cations and anions, as well as the stable isotopes of the water molecule (δ2H and δ18O) and sulphate (δ34S) values. Also, δ34S values from gypsum coming both from Triassic rocks and bottom of Jurassic sequence were also determined. The results obtained were used to classify the waters with a genetic criteria in three groups: (1) waters with a high gypsum influence, with sulphate coming from Jurassic gypsum, (2) waters without gypsum influence, where sulphate source could be atmospheric deposition from industrial processes and marine aerosol, and (3) waters with some gypsum influence, in which sulphate origin could be a combination of different sources. In relation to recharge, δ2H and δ18O values were close to those of Global Meteoric Water Line and fit a local line that suggests a meteoric origin. The estimated elevations for spring recharge are in agreement with those obtained from hydrogeological maps.

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