Potential of hydrogeochemical karstization of springs in Hashtgerd study area

Document Type : Research paper

Authors

1 M.Sc. Student of Water Resources, Department of Water engineering and Sciences, SRBIAU, Tehran, Iran.

2 Department of Water Engineering and Sciences, SRBIAU, Tehran, Iran

3 University of Tehran

Abstract

Structural and lithological features in the study area of Hashtgerd have provided suitable conditions for the formation of karst phenomena in the region. The high approximate groundwater level in the area is a sign that karst is not expanding in depth. The karst geomorphological forms are not as visible as the cave, the sinkhole, and the poner. The only karst phenomena observed in the Carnegie region are karst springs and dissolving cavities. The aim of this study was to study the hydrogeochemical study of springs with emphasis on the sex of the formation. For this purpose, 5 water samples from the permanent springs of the region were collected and chemically analyzed during the water shortage period (October 2016). The results of hydrogeochemistry of karstic springs and XRF in the region showed that karstic waters flow in a highly developed system. The average ratio of calcium ion to magnesium in selected springs is 2.29. Therefore, the material of the groundwater aquifer in the watershed of the studied springs is mainly calcareous. The degree of dolomite saturation index in the valleys of Vali Darvish Cheshmeh (2), Vardeh (4), and Yamanjliq (5) is negative, which shows and reflects the saturated conditions, and the higher density of surface and subsurface fractures, as well as the flow type - It is a source of water flow in these springs. Groundwater chemistry in carbonate rocks was a function of the dissolution of calcite and dolomite. The high water temperature in the Alan salt spring has affected the dolomite saturation capability in Dalan Formation. The results of factor analysis showed that the most important factor depends on the dissolution of carbonate and then on the amount of magnesium and electrical conductivity, which has the greatest effect on the rate of dissolution.

Keywords

References

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Hydrogeology
Volume 5, Issue 2
Publisher
January 2021
Pages 113-126

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