Geochemical assessment,mixing behavior and environmental impact of thermal waters in the Guelma geothermal system,Algeria

作者：Foued Bouaicha,Henia Dib,Oualid Bouteraa,Nabil Manchar,Kamel Boufaa,Nabil Chabour,Abdeslam Demdoum

摘要：A study of thirteen geothermal springs located in the geothermal field of Guelma,northeastern Algeria,was conducted.Samples were collected during the period between January 2014 and February 2016.Geochemical processes responsible for the chemical composition of thermal and mineralized water were evaluated.The hydrochemical analysis shows that the thermal waters are characterized by the presence of two different chemical facies,the first type SO4-Ca in the east,west and south of Guelma,the second type HCO3-Ca in the south.This analysis also attributed to sodium,chlorides,and sulfates to an evaporitic terrigenous origin by the molar ratio Sr2+/Ca2+.The thermal spring waters from Guelma geothermal system have a meteoric origin,and all samples are immature with strong mixing between hot and shallow waters with 19-38.5%rate of mixing.The silica geothermometer shows that these thermal waters have a temperature varying from 84 to 122℃and that the water came from a depth of 2100-3000 m through a fault system that limits the pullapart basin of Guelma.Potential environmental effluent from thermal spas could pollute in both the irrigation and drinking waters,and which imposes danger on the health of the inhabitants of the region.

發文機構：Department of Applied Biology Department of Geology Laboratory of Geology and Environment （LGE） Department of Geology Sciences Department of Earth Sciences

關鍵詞：GEOCHEMISTRYGEOTHERMOMETRYMIXINGThermalEFFLUENTSGuelmaAlgeria

分類號： P[天文地球]