Delineation of Cu prospects utilizing multifractal modeling and stepwise factor analysis in Noubaran 1:100,000 sheet, Center of Iran

Abstract

The aim of this study is to separate and subsequently determine geochemical anomalies for exploration of Cu mineralization in Noubaran 1:100,000 sheet, situated in the Urumieh-Dokhtar magmatic belt, Center of Iran. To do this, stepwise factor analysis and also a Concentration-Number (C-N) fractal modeling were used. Stepwise factor analysis can be effective in exact recognition of reciprocal genetic correlation between elements and data classification based on distinct elements associated with the studied deposit. Accordingly, after applying four steps of factorization, all the noise elements which had no role in the formation of geochemical processes were eliminated, and finally, factor score of Bi, Ag, and Cu were calculated. A C-N log-log plot for factor scores were plotted, and five threshold values were determined in order to delineate mineral potential maps of the target elements. The designated regions on the mineral potential map are in the NE, S, more limited in the SE, and the central parts of the area which show clear correlation with alteration zones. Field observation, mineralographical and petrographical studies of the polished and thin sections, and also AAS, ICP-MS, XRD analyses indicate pyrite, chalcopyrite, chalcocite, covellite, and bornite mineralizations are associated with sub-volcanic and intrusive rocks. Considering the evidence, it can be deduced that the effect of the postmagmatic fluids on Eocene pyroclastic units has led to the creation of the alterations and sulfide mineralized siliceous vein-veinlet.