| In the modern society,the direct prospecting in the earth's surface is more and more difficult,the prospecting is in searching for concealed ore deposits and half concealed ore deposits into the ground gradually,in the direction of development.With the progress of science and technology,the method of exploration with geochemical theory and the the technology have developed fully.in these theories and methods,how to determine the geochemical anomaly threshold is to become a common concern.In this paper,Yaoziping in Gansu province is the research object,the soil geochemical exploration sample analysis and comprehensive evaluation results is the basis.This paper uses the traditional iteration method,fractal method,factor analysis and cluster analysis method to process the data collected for the analysis of different methods on the different threshold extraction?This paper analysis of the relationship between each element research under the background of the elements in the regional geological metallogenic conditions,mineralization anomaly characteristics of local area and analyzes the characteristics of these anomalies.Use mathematical method to study the acquisition of the sample data for calculation and analysis;use the method of traditional iterative method and fractal method and make an analysis of the single element anomalies in this area.Use correlation analysis,factor analysis and cluster analysis to analyze the relationship between each element.Based on the analysis of each other between the elements and regional metallogenic conditions,geochemical information in the study area delineated prospecting target area.We collect 726 soil samples collected in the studied area and determined Au,Ag,Cu,Pb,Zn,As,Sb,Bi,Hg and other 9 kinds of element content,and statistical analysis of these elements.Results show that Au,Ag,Sb,As,the variation coefficient is close to or greater than 1,at the same time concentration values are more likely than clark,conducive to the enrichment of mineralization.The traditional iterative method and fractal method to extract the anomaly threshold of each element,based on the comparison of two kinds of anomaly threshold extraction known fractal method ofabnormal lower value smaller,framed anomaly area bigger,better able to identify elements of exception information.Use the correlation analysis,factor analysis and cluster analysis methods to study the association rule and relationship of each element.Through the above methods will be 9 kinds of elements in the study area is divided into three types of combination.Respectively is: F1 : Bi-Cu-Pb-Zn;F2 : Ag-Hg,Sb;As the F3 factor: Au –As;Through kriging method,circle the three factors of abnormal range.Formula one factor as the dominate factor,in the study area are mainly distributed in the east,in the study area belong to sulfur,easy to enrichment in acidic rock,represents the elements related to the magmatic hydrothermal combination on the lithology mainly silurian in-laws in group,metallogenic significance.F3 factor partition mainly located in the central and southeast of research area,has a wide distribution area,lithology for limestone,sandstone and quartz vein,Au and As other elements of the coefficient of variation is larger,high mobility,migration is strong,can have certain prospecting significance.F2 factor circle by the abnormal area is lesser,metallogenic significance.By fractal method to circle the a Au-Ag-Hg-Sb abnormal combination,the anomaly area of about 1.43 km ^ 2,the better combination sets,abnormal area and in-laws in north west fracture in the same direction.Research area in the north of springs of monzonitic granite and in-laws formation for metallogenic source of heat source and content;Condition of mine is very good,,has good ore prospects. |
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