The Ghareh chaman area is located on Urumeih-Dokhtar zone in E-Azarbaijan, which is mostly, comprises of acid and intermediate volcanic rocks along with alluvium. Regional geochemical exploration was carried out in the area by 698 stream sediment sampling with the aim of optimizing different methods for obtaining reliable exploration model in the area. Hence a comparative studies of data processing using lithological unit's discrimination (L.U.D) method and Fuzzy C-mean clustering (FCMC) for eliminating syngenetic component was attempted.
In FCMC method the normalized data was processed and the elements with higher percentage of sensord were eliminated and factor analyses on data were employed. Only one or two elements from each group were selected based on their factorial scores and then FCMC method on geochemical data was carried out on selected elements. The results revealed six optimized clusters. Using residual values for geochemical mapping the promising mineralized areas were detected. Application of  Fuzzy logic based FCMC on geochemical data reveal that, with membership of each sample in different clusters and estimating the residual values, the syngenetic effect is eliminated causing in detecting of  blind anomalies in the area. The comparative studies of different methods on stream sediments of Ghareh Chaman indicate that the employment of FCMC method has advantage of detecting anomalies precisely in a shorter period of time confirming the capability of this method in contrast to L.U.D particularly in regional scale exploration where the numbers of samples are enormously increasing.