Geochemical analysis of Gachsaran formation, The west of Iran

Document Type : Original Article


Department of Geology, Faculty of Earth Sciences, Payame Noor University, Tehran, Iran.



The aim of this study is to analyze the geochemical characteristics of the Gachsaran formation sequence located in the border areas of Iran and Iraq. Due to its lithological diversity, this formation has various chemical properties in its lithological content. For this purpose, chemical and elemental properties were determined using XRF and ICP-mass techniques. The XRD technique was also used to identify the mineralogical composition and finally the amount of pollution caused by these elements was evaluated using statistical methods.
           The results of this study showed that the concentration of CaO, MgO, TiO2 and the concentration of two elements namely Cd and Sb in the sequence of Gachsaran Formation in the study area is higher than their average in the earth's crust. On the other hand, investigations showed that according to the CF pollution index, Cd and Sb elements with values of 1.52 and 2 show moderate pollution. Enrichment factor (EF) showed moderate contamination for some elements.
   Three distinct groups were obtained according to the results of cluster analysis, each of Ti and Fe were classified as separate groups, and iron showed the greatest difference compared to other elements.