The Information Extraction And Evaluation Of The Soil Geochemical Survey On Shilongshan Au-polymetallic Mining Area In Luoning Country,Henan Province

The Shilongshan Au-Polymetallic Mining area is located in Luoning of Henan Province.it is located in the Xiaoqinling Au-Ag-Pb-Mo Metallogenic belt.In the geodetic position,The Shilongshan Au-Polymetallic deposit is located in the southern margin of the North China.Early Paleozoic-Mesozoic Au-Cu-Ag-Pb-Mo metallogenic belt in the North Qinling.The main exposed strata which are the Taihua Group Yangsigou Formation and the Xiong'er Group Xushan Formation,both of which are the main source layers in this study area.Tectonic is developed in this study area.Magma activity is strong.Providing conditions for the formation of Au-polymetallic ores.The wall rocks of Au-polymetallic Mining area show silicification and pyritized which is closely related to the Au-polymetallic ore.In order to find the hidden Au-polymetallic ore in the study area.Based on the extensive collection and review for geological data and related research results of predecessors working in and around the region,this paper systematically understands the metallogenic geological background of the Shilongshan Au-polymetallic ore district.Conducted 1:10000 soil geochemical survey prospecting research work in this study area.Analyzing and testing 10 elements such as Au,Ag,Pb,Zn,Cu,W,Mo,As,Sb,Bi,etc.,combined with the geological characteristics of the study area.Information extraction and evaluation of prospecting information for soil geochemical survey in Shilongshan Au-gold polymetallic ore which is districted by analytic hierarchy process and factor analysis.The main results are followed:1.The mean value-average variance method was used to determine the background value and abnormal lower limit of 10 single elements in the study area.By formulating 10 single element anomaly maps and studying the abnormal distribution of single elements,141 single element anomalies were delineated;The standard performs comprehensive scoring and abnormal ranking on 10 single elements.2.By using R-type cluster analysis and factor analysis,the distribution characteristics of elements in the Shilongshan gold polymetallic ore district was studied,four effective ore-seeking information elements that can indicate gold polymetallic ore were extracted:(1)As-Sb-Au,(2)Cu-Pb-Ag-Zn,(3)Mo-Bi,(4)W;At the same time,combined with the mineralization geological background of the study area,compile geochemical combination element anomaly maps in using Mapgis,SPSS,Excel and other software,the geochemical combination element anomaly map was compiled by the factor loading mathematical expression of the rotation component matrix,and 44 element combination anomalies were circled.3.According to the geological conditions,element distribution characteristics and abnormal scores of the study area,six anomalous areas are identified namely:one for Class ? ore prospecting targets,this target is located in the strata of the Xushan Formation and the Yangsigou Formation on both sides with the Au-mineralized alteration zone;three for Class II ore prospecting targets,these targets are located at the intersection of the metamorphic TTG rock series and the Au-mineralized alteration fault zone and the two sets of strata of the Yangsigou Formation and the Xushan Formation;two for Class ? ore prospecting targets,these targets are located in the Xushan Formation and the Yangsigou Formation.4.Combined with the ore-forming geological conditions of the strata,tectonic and magmatic rocks in the study area.Factor analysis and analytic hierarchy process(AHP)are combined to establish elemental anomalies based on the weights of the four element combination anomalies in the mathematical model of elemental anomaly evaluation at each level.The evaluation index system is used to construct a mathematical model for comprehensive anomaly evaluation of elements.Based on this model,the ore-seeking favorableness evaluation is carried out for the six prospecting targets that have been delineated.