Study of the Hydrogeochemistry of Taftan Volcano's Mineral Springs and their Relation to Hard-Rock Masses of Region

Taftan is a stratovolcano، located to the SE of Zahedan، eastern Iran. Due to the highlands of the volcano، a microclimate is created in the region where precipitation provides some water in the arid region that the volcano is located. Field studies and chemical analyses of thirteen mine springs from western flanks of the volcano indicate that springwater in Taftan is somehow related to volcanic rocks. Based on hydrogeochemical analyses، significant variation in Mg2+ (2-150)، Ca2+ (11-465)، Na+ (10. 5-444)، K+ (1. 5-330)، SO42- (8-1050)، HCO3- (0-353. 8)، NO3- (1. 1-58. 6)، Cl- (10. 65-1520) and mole fraction of SiO2 (6. 11-182. 87) all in mg/L is affected by the chemical composition of volcanic rocks. Since springwater in Taftan shows significant compositional variation، it is concluded that the springs originated mainly due to precipitation، affected by water-rock interaction to some extent. However، a few springs show characteristic of juvenile water and some may have a mixture of juvenile and meteoric water.