| Abstract |
Compilation and treatment of geological, hydrostratigraphical, geophysical and hydrogeothermical information's are very important to assess natural resources of the sedimentary basin which is characterized by its extension, geology and hydrodynamism. Hydrochemical investigation is necessary to more understanding the relationship between thermal circulation, mineral deposits and the water - rock interaction. The chemical composition of the thermal waters seems to be controlled by the Triassic evaporate and influenced by the mineral deposits. Especially, the Fluorite deposits result from hydraulic fracturing and suggest the presence of active hydrothermal system and high temperatures in deep aquifers. The studied area is located in the province of Zaghouan in North Eastern Tunisia. This part of the Tunisian Atlas is characterized by geothermal springs and several mineral deposits (F, Pb, Zn, Ba). The main aim of this study is to establish the origin of thermal springs, their relation with the geological and structural settings of the area and the relationship between hydrothermal waters and mineral deposits. Structural studies show that the thermal emergencies are essentially controlled by tectonics and halocinetic movements. Thanks to geological, geophysical, hydrochemical, geothermal and geothermometric approaches carried out in the studied area, it was possible to identify the potential reservoirs. Among these, the Jurassic limestone seems to be the most promising reservoir of thermal waters. The study of Jurassic aquifer in North Eastern Tunisia, particularly in Zaghouan basin, reinforced the plausible genetic linkage idea between hydrothermal and mineral deposits. |