The Geochemical Data Processing And Metallogenic Prospective Prognosis Of Fuxin Region In Liaoning Province

The geochemical data processing,which affects the result of the geology survey,is an important part of the geochemical exploration.Different geochemical data processing methods have their own advantages and disadvantages,therefore,as a combination,several methods are selected to get all possible anomalies that reflect the information useful to the prospecting and ensure every anomaly is not absent.Then,these anomalies are given to geologists who identify and verify these anomalies for all possible mineral resources of the region.This article,relying on the 1:25000 water system sediment survey and the anomaly investigation of Fuxin area in Liaoning province carried out by the Fourth Detachment of the People's Armed Police Force Gold,calculates the anomaly threshold of the elements of Au,Ag,Cu,Pb,Zn,As,Sb,Bi,Hg,Mo in Fuxin area by the gradually eliminate method,the fractal method and the subregion median contrast filtering method,and the above process is achieved by VBA and MATLAB codes,and the single element anomalies are delineated.Then the paragenetic association characteristics of the 10 elements are studied with the correlation analysis,cluster analysis and factor analysis and the composite anomalies are delineated.These anomalise are classified,sorted,explained and evaluated.Then the metallogenic prospective prognosis areas are determined by the ore-forming energy method and the suggestion is given to geologists for the prospecting.The gradually eliminate method is the most commonly used method of the geochemical data processing,however,it only emphasizes the randomness and frequency distribution of the data,ignoring the spatial distribution of the element content,and the fractal method gives consideration to both of them.The gradually eliminate method and the fractal method have strict basic assumptions,and the two methods can be used after meeting assumptions.However,the subregion median contrast filtering method doesn't require any assumption and can identify outliers and distinguish anomaly population from background population based on the inherent characteristics of the data,and doesn't require pretreatment of the raw data.The gradually eliminate method and the fractal method regard the whole area of the geochemical background as a no ups and downs of plane,while the subregion median contrast filtering method regards the whole area of the geochemical background as the continuous change surface by the movement of the center window and square annulus,and this is closer to the actual geological conditions.According to the correlation analysis,there is a good relation between Ag and Sb,and Pb,Zn,As,Mo are related,and there is very weak relation between Au and other elements.According to the cluster analysis,the 10 elements can be divided into three categories:the combination of Ag,Sb,Au is the first category;the combination of Bi,Hg is the second category;the combination of Pb,As,Zn,Mo,Cu is the third largest category.According to the factor analysis,10 element variables can be converted into seven factors:the F1 common factor represents the combination of Ag-Sb-Pb,which plays a primary role in these factors and is related to the precious metal hydrothermal mineralization;the F2 common factor represents the combination of Cu-As;the F3 common factor represents the combination of Hg;the F4 common factor represents the combination of Au;the F5 common factor represents the combination of Bi;the F6 common factor represents the combination of Zn;the F7 common factor represents the combination of Mo.The ore-forming energy method is used to extract and select the synthetic geochemical anomaly of the research area.According to the partition principle of the metallogenic prospective prognosis area and the geology and geochemical characteristic of the research area,there is 4 metallogenic prospective prognosis areas,considering the classification and evaluation results of geochemical anomalies of the 1:25000 water system sediment survey.The metallogenic potential of the Jinjiadian(?-1)metallogenic prospective prognosis area is relatively large,and the anomaly of the area may be caused by gold-bearing mineralization bodies,and the area is the favorable mineralization position of Gold and polymetallic.The metallogenic potential of the Gelige(?-1)metallogenic prospective prognosis area is relatively large,and the anomaly of the area may be caused by gold-bearing and copper-bearing mineralization bodies,and the area is the favorable mineralization position of Gold and polymetallic,and large concealed orebodies or blind orebodies may be found in the area.The metallogenic potential of the Dachaoyanggou(?-2)metallogenic prospective prognosis area is relatively large,and the anomaly of the area may be caused by gold-bearing and copper-bearing mineralization bodies,and the area is the favorable mineralization position of Gold and polymetallic,and the area is worth further work.The metallogenic potential of the Dachaoyanggou(?-2)metallogenic prospective prognosis area is relatively large,and the anomaly of the area may be caused by silver-bearing and lead-bearing mineralization bodies,and the area is the favorable mineralization position of polymetallic,and the area is worth further work.