Study of Geological Formations Effects on Quality of Harzandat Plain Waterground Resources
The studied area is located 100 km, northwest of Tabriz city in northwest of Iran (45o, 31' to 45o, 47'E and 38o, 35' to 38o, 46' N). It is a small basin with average precipitation and Temperature of 280 mm and 13C respectively. The groundwater resources have a vital role in supplying drinking, agricultural and industrial demands, and it is suffering from high salinity (TDS) in the most parts of the plain (ranges from 900 to 4020 mg/l).
The aim of this study is to analize the water quality of the area and determine the effects of geological formations on the hydrochemical deterioration of the groundwater quality in the area. Thus from previous hydrochemical data and 18 collected samples, from the plain well, it deduced that except the water of the karstic spring the other samples are not suitable for drinking and as well as for agricultural uses. The main type of ground water in the area is chloride and the sodium as a domain cation. From the industrial point of view, samples collected from the eastern parts of the area are incrustal water and samples from the western parts show characteristics of corrosive water.
According to this study, the effect of different geological formation on the groundwater quality is not distinguishable, but it seems that low hydraulic conductivity of the alluvial deposits of the plain is the main cause of the salinity in the area.