Providing the bivariate anomaly map of Pb and Zn using

چکیده مقاله

The U-statistic method is one of the most important univariate structural methods which consider spatial situation of samples. This method is a kind of weighted mean that surrounding points of samples are considered in U value determination and by increasing samples number, mentioned error is decreased. However, it separates anomaly based on one variable. In present study, the U-statistic applied on Mahalanobis distance values of samples because Mahalanobis distance is calculated based on several variables. This method is a combination of efficient U-statistic and Mahalanobis distance. Combination results for Pb and Zn elements in Parkam district, Kerman, Iran, led to better performance of these two methods. Results show that samples indicated by the combination of these methods as anomalous are more regular; less dispersed and are more accurate than using just one of them.

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