Hydrogeochemical and geothermometric approach to the study of thermal waters in the northwestern region of Algeria. Application of a PCA to the chemical data of hot springs.

Proceedings of The International Conference on Innovation in Renewable Energy and Power

Year: 2018 | Page No:65


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Yosef Jabareen



Known for its geological, structural and tectonic complexity, the northwestern region of Algeria has very important thermal manifestations. The presence of thermal springs in this region are linked to the existence of faults. Ten sources of spas were analyzed in the laboratory of the National Tourist Company in 1984. The chemical analysis of the major element concentrations (Ca2 +, Mg2 +, Na +, K +, Cl-, SO4 2-, HCO3 – and NO3 -) and the physico-chemical variables (temperature, electrical conductivity, dry residue and pH). The physico-chemical composition of warm waters in this region shows a very varied chemical facies due to the complexity of geology. Three water families have been defined (bicarbonated water, chlorinated, sulphated). These therapeutic and therapeutic thermal waters spring from the bowels of the earth at a temperature ranging from 30 to 66.5 ° C . The warm waters in this region are slightly acidic to neutral (pH = 6 to 7.98) and are highly mineralized with an electrical conductivity that oscillates from
0.289 mS / cm at Hammam Bouhdjar and 6.5 mS / cm at Hammam Boutrigue.
The salinity of water varies from 0.45 g / l in Hammam Boughrara to 7.85 g / l in Hammam Boutrigue.
The study of the origin of the main major elements present in the thermal waters of Oran reveals that:
– the ions Na + and Cl- which exist in the waters come mainly from the dissolution of the halite;
– The ions Ca2 +, Mg2 + and HCO3 – come mainly from the dissolution of the carbonate formations of the Jurassic.
– The calcium ion is also derived from the dissolution of gypseous evaporite formations.
Principal Component Analysis (PCA) was used to analyze the correlation structure between the physicochemical characteristics of thermal springs.
In order to evaluate the warm water potential of the north-western region of Algeria, a synthetic approach was adopted using the silica geothermometer (Quartz and Chalcedony) giving acceptable values below 125 ° C therefore the thermal waters of this region are of low enthalpy.

Keywords: Geology- Electric conductivity- Geothermometer- Hydrogeochemistry – Principal Component Analysis –Thermal Springs.