Evaluation of hydrogeochemical processes of alluvial aquifer of the Golgir plain

In order to evaluation of processes are effective on mixture groundwater of Golgir plain,saturated indexes and mixture curves is calculated and drown for dry period (Shahrivar1385) and wet period (Isfand1385). Considering development of Sulfate and Limestone formations around the Golgir plain, values of saturated indexes of sulfate minerals calculated with PHREEQC computer code in the boundary of the Golgir aquifer. The result shows that they are sub saturated in the most of samples and different seasons. This means these minerals are solutable in the water. In wet period saturated index of the most of samples is decreased because of increasing groundwater recharge caused from rainfall. As in sampling of dry period, the most of samples were in condition saturated to supersaturate from Calcite and Dolomite. On the base of the Mg/ (Mg + Ca) curve against to So4/ (So4+HCo3) curve is determined the water samples of Golgir deep drink wells are in Calcite solution domain but Cement factory wells is placed in south of the Golgir plain, is tend to dolomite solution domain. Based on the result of mixture curves, Sulfate and Carbonate minerals solution processes is the main factor controls chemical mixture of water. Type of sedimentation and geology formations of region is the most important effective factor on chemical mixtured of water.