U-spatial statistic data modeled on a probability diagram for investigation of mineralization phases and exploration of shear zone gold deposits

Abstract

In Model-Based Objective Techniques, MBOT, the geochemists avoid using personal opinion in determination of threshold value. The two most important methods of MBOT are U-spatial statistic and modeling of probability diagram. The spatial coordination of the samples, as weight of measured values, is applied in the calculation of threshold value for anomaly separation. The U-spatial statistic data modeled on a probability plot is a new method in anomaly separation. This method is a combination of U-spatial statistic and modeling of probability plot and was used for the first time in this article. This new method provides the opportunity to identify different geological events that control the concentration variations in the lithogeochemical environments based on U-values. It is also possible to determine the number, type and intensity of these events. The results of using this method for Au element in a shear zone gold mineralized area, south western part of Saqez, Iran, led to identification of three mineralized areas. The epigenetic effects, as mineralization events, affected the concentrations in two stages with different intensity. Both of these stages are interpreted as hydrothermal fluid effects, but the second stage with higher intensity has led to probability anomalous areas.