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Geochemical and hydrogeological studies of a sodium sulphate deposits: the case of Sabkhet El Ghine Oum El Khialate, southeast Tunisia

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Abstract

The El Ghine-Oum El Khialate sebkha extends in southeast Tunisia on over than 75 km2. This depression is filled by recent Quaternary deposits containing a brines aquifer situated at a depth varying from 1 to 10 m. This aquifer is highly rich in sodium sulphate. At the surface, noticeable is the deposition of mirabilite and thenardite encrusting. To quantify the salt reserves for a rational exploitation, thirty dry cores (approximately 160 m of core) were carried out in the sebkha. They underwent integrated geological, geochemical and hydrogeological studies. The estimated reserves are in the range of 8.10t: Na2SO4, 2.10t NaCl and 1.10t MgCl2. The extraction of these salts is restricted by the relatively poor hydrodynamic characteristics of the reservoir evaluated during pumping tests.

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Correspondence to Wissem Gallala.

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Tagorti, M.A., Guellala, R., Gallala, W. et al. Geochemical and hydrogeological studies of a sodium sulphate deposits: the case of Sabkhet El Ghine Oum El Khialate, southeast Tunisia. Carbonates Evaporites 29, 299–307 (2014). https://doi.org/10.1007/s13146-013-0180-3

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