Hydrogeology, Hydrogeochemistry and Isotope Hydrology of Al Kufrali and Sirt Basins, Eastern Libya

Publisher:
Gutenberg Press Ltd
Publication Type:
Conference Proceeding
Citation:
Geology of East Libya - Third Symposium on the Sedimentary Basins of Libya, 2008, 4 pp. 343 - 354
Issue Date:
2008-01
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Large volumes of good quality groundwater occur in aquifers withinAl Kufrah and Sirt sedimentary basins. The main aquifer in Al Kufrah Basin is the Cretaceous Nubian Sandstone which consists of cross-bedded sandstones, conglomerates and shales. Other sandstone aquifers occur within the SilurianAcacus Sandstone and the Cambro-Ordovician Gargaf Group. Al Kufrah Basin forms a synclinal structure which is separated from the Sirt Basin to the north by the Jabal Az Zalmah uplift. Groundwater in the Nubian aquifer flows towards the northeast, but in the Sirt Basin aquifers it flows northwards towards Jab discharging into the depressions (Sabkhat A1 aliabT). The extent of the hydraulic connection between Al Kufrah and Sirt basins in the ThzirhO region is not clear, but groundwater may discharge from the aquifers in Al Kufrah Basin by upward leakage across the shales of the Silurian Tanezzufi Formation. The discharge would occur into the aquifers of Tertiary age in the Sin Basin whichunconformably overlie their older counterparts inAl Kufrah Basin. Hydrochemically, Al Kufrah groundwater is classified into sodium-chloride and calcium-bicarbonate facies, whereas Tazerbti and Sarir groundwaters are classified, respectively, into sodium-bicarbonate and sodium-chloride facies. These classifications are consistent with geochemical evolution and mixing along a generalized south to north and northeast fiowpath.
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