Document Type: Research Paper
Department of Geology,Faculty of Science, University of Sistan and Baluchestan, Zahedan, Iran
Department of Geology, Faculty of Science, University of Sistan and Baluchestan, Zahedan, Iran
Department of Hydrogeology and Environmental Geology, Faculty of Earth Sciences,Shahrood University of Technology, Shahrood, Iran
The Bazman volcano in the southeast of Iran is considered to be a dormant volcano. To study the hydrogeochemistry and geothermometry, sixteen water samples were collected from the thermal and cold springs. Temperature of the cold springs range from 28.1 to 36.6 C while mean temperature of the thermal spring waters is ~42 C. Generally, the salinity values of the water samples vary from 1102 in the cold spring to 10250 µS/cm in the thermal springs. The water samples are categorized into three types: Cl -Na, Cl-HCO3-Na-and SO4-Na. The composition values of δ2H and δ18O in the thermal springs were resulted from water-rock interaction or underground evaporation in the deep depths. Since the thermal springs have a different temperatures but similar chloride content, it seems that a conductive cooling mechanism is occurring in the geothermal system. Based on the geothermometry results, the equilibrium temperature of the deep reservoir estimated from ~120 to 145 C. The fraction of the cold water mixed with the warm water ascending is estimated to be ~0.94. Finally, the depth of thermal water circulation is estimated to ranging from 1.9 to 3 km under two different scenarios.