Gold And Silver Polymetallic Ore Metallogenic Law And Metallogenic Prognosis Of Xiaoshan Region In The South Margin Of North China Craton

In recent years,Zhonghe and Laoliwan silver-lead-zinc deposits have been discovered in the eastern Xiaoshan of North China block,which is a major breakthrough of Prospecting work,and at the same time shows great prospecting prospects inthis area.Therefore,the metallogenic series? metallogenic law? regional metallogenic model ? comprehensive ore prospecting model ? the exploration technology of Shallow cover area and regional metallogenic prognosis have become an important part of the study.This paper attempts to solve the above problems through the study of the geological features of typical deposits,Yanshan magmatic rocks,the application of C-A and S-A non linear theory,and the metallogenic prediction based on SVM and improved Adaboost algorithm.Through the study on the ore-forming geological conditions?Geological features of ore deposits?Metallogenic element combination and metallogeny of the gold and silver polymetallic deposit,this paper point out that there are four types deposit in this area : Shenjiayao gold deposit ? Xiaoshan gold deposit ? Yinjiagou sulfur-iron polymetallic deposit and Zhonghe-Laoliwan silver-lead-zinc deposit.On this basis,the Gold and silver polymetallic ore metallogenic law,regional metallogenic model and comprehensive ore prospecting model are studied.The LA-ICP-MS zircon U-Pb chronology of the Zhonghe rock shows that the age of rock mass is 135.4±1.6Ma,which is the product of Early Cretaceous magmatism.The study of rock geochemistry in the region indicates that there are two types of granite in this area: one is low Y and high Sr type granite,with the geochemical characteristics of the agakite,and the other is low Y and low Sr type granite,which is Himalaya granite.The two granites are formed by partial melting of the thickened lower crust.The non linear theoretical techniques,such as C-A and S-A,have successfully solved the problem that extracting geochemical information is difficult in the shallow cover area of the esten Xiaoshan region.Though the singularity analysis,the weak geochemical anomaly of Silver element are successfully identified.Based on the two algorithms of SVM and the improved Adaboost,the metallogenic prognosis of gold and silver polymetallic ore is carried out in the eastern Xiao-shan region,In which 12 prospecting target are delineated,including 4A type,4B type and 4 C type targets.The author believes that here are several regions,such as Xiao-meihe region?Heishangou region?region,whinc still have have good prospects in addition to the target area that is currently being carried out.And in this process the multi information integration of the Adaboost algorithm is further promoted.