Dating tools applied to mineralized Eocene groundwater, for a sustainable management of the Entre-deux-Mers drinking water, Aquitaine Basin, South western France.Reportar como inadecuado




Dating tools applied to mineralized Eocene groundwater, for a sustainable management of the Entre-deux-Mers drinking water, Aquitaine Basin, South western France. - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

1 BRGM - Bureau de Recherches Géologiques et Minières 2 EGID - Environnement, Géo-ingénierie et Développement

Abstract : In the south-west of France, the Eocene aquifer is one of the main resources for irrigation, thermo-mineral water, and mainly for drinking water in the Bordeaux region. This aquifer is characterized by the presence of a large mineralized area, centered on the Entre-deux-Mers region, between the Garonne and the Dordogne rivers, where the groundwaters show strong mineralization and anomalous levels of critical elements, such as sulphates and fluoride, leading to difficulties of resource exploitation for drinking water supply. Combined geochemical analysis major and trace elements and classical isotopic methods using δ18OH20 and δ2HH20, δ34SSO4 and δ18OSO4 is carried out. In addition, an innovative isotopic method using strontium isotopes 87Sr-86Sr and more exploratory isotopic methods using boron δ11B, lithium δ7Li, uranium 234U-238U, thorium 230Th-234Th and radium 228Ra-226Ra isotopes are applied on the mineralized area. U-Th results are compared to former 13C -14C results. Moreover several 3H analyses have been performed on 11 samples, including one spring which age and original aquifer were unknown. These dating tools may help to better understand the complex circulations in the Eocene aquifer, of primary importance for drinking water, and its connections to the others aquifer layers. The results of this dating approach coupled with hydrodynamics models, hydrogeological knowledge and a better understanding of the deposit conditions and mineralization may help to better manage this strategic resource of drinking water.





Autor: Eline Malcuit - Philippe Negrel - Christophe Innocent - Emmanuelle Petelet Giraud - Pierre Durst -

Fuente: https://hal.archives-ouvertes.fr/



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