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- W1644721976 abstract "In the Saida area, Algeria, a regional aquifer has formed in Jurassic carbonate rocks. Recharged by direct infiltration and swallow holes on horsts, it discharges into the Saida graben. Geochemical and isotope contents show deep groundwater flow at temperatures of around 100 °C at depth and CO2 of deep origin, developing a hydrothermal karst interconnected with the shallow, classical karst. This particular type of karst aquifer, mixing hydrothermal karst conduits in the phreatic zone and classical karst features in the infiltration zone occurs preferably in active tectonic regions. Such a situation is favourable to productive well boring, consequently to groundwater withdrawal and deterioration of water quality. Still badly known in general, this type of complex aquifer should be studied in depth for an efficient and proper exploitation and protection of the groundwater resource. À Saïda (Algérie), les roches carbonatées du Jurassique constituent un vaste aquifère, exploité pour satisfaire tous les besoins en eau de la région. Il est rechargé par infiltration directe et pertes karstiques sur les horsts et se décharge dans le graben de Saïda. Les données géochimiques et isotopiques prouvent que des circulations profondes atteignent en profondeur des températures proches de 100 °C, avec des venues de CO2 profond, à l’origine d’un karst hydrothermal connecté au karst classique. Ce type particulier d’aquifère karstique, où coexistent des conduits d’origine hydrothermale dans la zone noyée et des phénomènes karstiques dans la zone d’infiltration, se forme de préférence dans les régions tectoniquement actives. Une telle situation est favorable au succès des forages, donc aux prélèvements d’eau souterraine et à la dégradation de la qualité de l’eau. Encore mal connu en général, ce type d’aquifère complexe doit être mieux étudié pour être enfin correctement exploité et protégé." @default.
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- W1644721976 date "2008-07-01" @default.
- W1644721976 modified "2023-10-16" @default.
- W1644721976 title "Mixed, classical and hydrothermal karstification in a carbonate aquifer" @default.
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- W1644721976 doi "https://doi.org/10.1016/j.crte.2008.04.002" @default.
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