Geochemical Characteristics Of Soils And Prospecting Assessment Of Lijiaao Lead-Zine Mining District In The Dachang Guangxi

The study area is located in the middle of The NanDan-HeChi Metallogenic Belt, the northeastern edge of Dachang ore field. Exploration working degree of study area is not enough, and need to conduct soil geochemical survey combining the work of predecessors; Get the soil geochemical anomaly characteristics of indicator elements, combined with the geological characteristics of study area, explanted and evaluated those anomalies reasonably, delineated ore prospect areas, reduced ore range.This paper analyzes the basic statistical characteristics of 13 elements in the soil. Au, Ag, Cu, Pb, Hg, Bi, Sn, Zn, As and Sb elements have obvious secondary enrichment tendency; Ag, As, Sb, Cd, Mo these associated elements are unevenly distributed, showing a strong differentiation characteristics, is a good info-mineralization geochemistry conditions.Through iterative method to calculate threshold of 13 elements and draw single element anomaly map, which all abnormal concentration zoning is uniform and anomaly dimension is different or big. Among them Sn, Mo, As and Bi have more anomaly number, Ag, Pb, Sn, Mo, As and Sb elements reach three-level concentration zoning, Pb, Sn, Mo and Bi have big anomaly dimension, Ag, Cu, Pb, Zn, Sn, W, As, Sb and Bi anomaly distribution sleeve better.It provides the main basis for delineating ore prospecting area, which are researched association characteristics of soil geochemical elements and the comprehensive element anomaly graph using multivariate statistical analysis. Through correlation analysis showed:there are remarkable correlation among Pb、Zn、Sn、Bi、Sb、Cd and Ag. Through cluster analysis showed: Pb, Ag, Zn, Cd, Sb, Bi, Sn and As is a kind of middle-low temperature elements combination, is also the main ore-forming elements in the supergene environment secondary enrichment combination. Through factor analysis showed:F1 factor (Zn-Cd-Bi-Sb) is a combination of most important secondary enrichment elements; F2 factor (Pb-Ag) is a combination the relatively minor secondary enrichment element. Compared correlation analysis with cluster analysis and factor analysis, obtained two important types of element combinations in study area, Zn-Cd-Bi-Sb is the most important ore-forming elements combination, Pb-Ag is relatively minor ore-forming elements combination in study area.Through analysis the tectonic system of study area, Found in stress concentration zone of study area is mainly distributed in on tip and sides of the fault, and there is also the stress concentration region in the core of fold; generally there are good developmental fractures condition with core of fold and near fault. Good structural development condition is a very important prospecting criteria, also is very favorable metallogenic conditions to the study area.The deposit genesis of study area is "exhalative hydrothermal sedimentary+ late hydrothermal reformation", Analysis the favorable factors of mineralization in the study area, Combined with the mineralized bodies output and exploration engineering controlling, the study area could be divided into 4 ore-prospecting areas, there are 3 first order ore-prospecting areas, respectively A1, A2, A3; there are lsecond order ore-prospecting areas, respectively Bl. Al and A3 are the next key exploration area.