Residence time, mineralization processes and groundwater origin within a carbonate coastal aquifer with a thick unsaturated zoneReportar como inadecuado




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1 SPE - Sciences pour l-environnement 2 GR - Géosciences Rennes 3 GEGENA2 - Groupe d-Étude sur les Géomatériaux et Environnements Naturels, Anthropiques et Archéologiques 4 LCE - Laboratoire Chrono-environnement

Abstract : This study aims at establishing groundwater residence times, identifying mineralization processes and determining groundwater origins within a carbonate coastal aquifer with thick unsaturated zone and lying on a granitic depression. A multi-tracer approach major ions, SiO2, Br-, Ba+, Sr2+, 18O, 2H, 13C, 3H, Ne, Ar combined with a groundwater residence time determination using CFCs and SF6 allows defining the global setting of the study site. A typical mineralization conditioned by the sea sprays and the carbonate matrix helped to validate the groundwater weighted residence times from using a binary mixing model. Terrigenic SF6 excesses have been detected and quantified, which permits to identify a groundwater flow from the surrounding fractured granites towards the lower aquifer principally. The use of CFCs and SF6 as a first hydrogeological investigation tool is possible and very relevant despite the thick unsaturated zone and the hydraulic connexion with a granitic environment.

Keywords : Flow pattern Corsica CFCs Residence time Coastal aquifer SF6





Autor: Sébastien Santoni - Frédéric Huneau - Emilie Garel - Virginie Vergnaud-Ayraud - Thierry Labasque - Luc Aquilina - Jessy Jaunat

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



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