Kreis M. B. auteur aut IRD Taupin Jean-Denis auteur aut IRD Patris Nicolas auteur aut IRD Vergnaud-Ayraud V. auteur aut IRD Leduc Christian auteur aut IRD Lachassagne Patrick auteur aut IRD Burte J. D. P. auteur aut IRD Martins Espr auteur aut IRD text journalArticle eng text/pdf born digital access Shallow crystalline groundwater in the semi-arid hinterland of Ceara is brackish or saline with mixed chloride or sodium chloride facies. Very few hydrochemical data are available for the area and the drivers behind this salinity are not clearly identified. In this study, extensive field data collection was performed to provide new information about the hydrogeological functioning and the salinization processes, through the implementation of piezometric, hydrogeochemical, isotopic (18O, 2H) and multitracer dating (14C, 3H, CFC, SF6) monitoring. Piezometric and isotopic data evidence fast flow circulation processes and a high contribution of evaporated surface water to aquifer recharge. Multitracer dating shows the groundwater is essentially composed of seasonal vertical infiltration flows that mix with older waters stored in the aquifer. Chemical analyses suggest the groundwater, originally low mineralized, has become progressively saltier due to leaching of salts that were evapoconcentrated in either surface waters or the unsaturated zone during drier periods. specialized hydrogeology hardrock aquifers semi-arid climate salinization isotopes environmental tracers groundwater dating hydrochemistry Brazil BRESIL ZONE SEMIARIDE 062 020 68 15 2189-2207 2023 0262-6667 https://www.documentation.ird.fr/hor/fdi:010090321 10.1080/02626667.2023.2253227 0262-6667 [F B010090321] https://www.documentation.ird.fr/hor/fdi:010090321 https://www.documentation.ird.fr/intranet/publi/2023-11/010090321.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2023-11-10 2025-02-24 fdi:010090321 fre