Geochemical Anomaly Assessment And Metallogenic Prediction Of The Zhaobishan In Gansu

Geochemical anomaly prospecting has always been a hot spot in geochemical exploration.Especially regional geological anomaly information identification and determination of the threshold,The problem of the constant has been attentioned of geologists,The study of prospecting for mining information such as geochemical anomalies in the gobi area is an important way to promote the breakthrough of mineral exploration in the gobi region.The research of this paper is of great significance to the prospecting of the area.This paper regards Zhaobishan in Gansu province as the research object,using traditional iterative method,EDA method,correlation analysis,factor analysis and clustering analysis method analyzes 818 soil samples.Research the advantages of various elements in the metallogenetic background,Geological changes of metallogenic elements,Local mineralization anomaly characteristics and controlling factors,obtained various abnormal information about different levels of metallogenetic material,get the following conclusions:(1)Measuring 9 kinds of elements content.Results show that :Sb,As,Au,Ag,the variation coeffi-cient is close to or greater than 1,at the same time,concentration of clark value is bigger,also conducive to the enrichment of mineralization.(2)This paper uses traditional iterative method and EDA method to extract the anomaly threshold of each element.Comparing two kinds of anomaly threshold extraction we can know that: EDA method to extract the abnormal lower limit of smaller,framed anomaly area bigger.So EDA method can identify elements of exception information better.(3)Using the correlation analysis,we find: the correlation between Cu and Zn is stronger,the correlation between Pb and Bi,Zn,Zn and the correlation of Bi,Ag,Sb's correlation is stronger;Using factor analysis and clustering analysis method,9 kinds of elements in the study area are divided into three types of combinations: F1 : Bi-Cu-Pb-Zn;F2 : Ag-Hg,Sb;F3: Au –As;Through kriging method,circle the three factors of abnormal range.Formula F1 factor as the dominate factor,represents the elements related to the magmatic hydrothermal combination on the lithology mainly silurian in-laws in group,metallogenic significance.F3 factor partition mainly locatedin sandstone and quartz vein,Au and As other elements of the coefficient of variation is larger,high mobility,their migration is strong,and can have certain prospecting significance.F2 factor circle by the abnormal area is lesser,metallogenic significance.(4)Through EDA method,we circle the portfolio abnormal?,?,including?combination anomaly of Au-Ag-Hg – Sb,this the exception set is better.Condition of mine is very sufficient,and is an important target of search of the golden snap type gold deposits with good ore prospects.Combination ? for Au-Ag anomaly combination,the rock control obviously,but the abnormal area is lesser,the prospecting significance is not satisfaction.