Geochemical Characteristics And Metallogenic Prediction Of Qihaolinchang-Ershisizhan Area In Heilongjiang Province

The study area is located in the northeast of the Greater Khingan Mountains,lie on the Erguna block in the east of the Central Asian orogenic belt.It is between the Mongolian-Okhotsk suture zone and the Tayuan-Xiguitu suture zone,the magmatic activity was particularly frequent in Yanshan period.Multiple tectonic movements and magmatic activities provide good geological conditions for the formation of the deposits,which are important gold and polymetallic metallogenic areas in China and have good prospecting prospects.The author according to the result of 1:50000 stream sediment survey,analysis and research in the distribution and combination characteristics of ore-forming elements,combined with the geological background,the anomaly characteristics of the combination and important anomalies as a result,has a certain potential for delineating the metallogenic prospect areas,to the region to find ore prospecting breakthrough quickly,reduce the risk of prospecting is of great significance.On the basis of previous geological work,using field geological survey and comprehensive research method,this paper has carried out a comprehensive analysis and study on the geochemical characteristics of stream sediments from Qihaolinchang to Ershisizhan.The main conclusions are as follows:(1)The distribution characteristics of As Au,Ag,As,Sb,Hg,Cu,Pb,Zn,Bi and W,have been found out through 1:50,000 stream sediment survey in the area.Combined with the results of element discrete characteristic analysis,correlation analysis,R-type clustering analysis and factor analysis,the main ore-forming element in the study area is Au,and the favorable ore-forming indicator elements are Ag,As,Sb and Hg.(2)In the study area,394 anomalies of single element and 49 anomalies of combination were identified.According to the comprehensive classification of combination anomalies,2 anomalies of class A,8 anomalies of class B,33 anomalies of class C and 6 anomalies of class D were classified.(3)According to the geochemical characteristics of combined anomalies and the results of anomaly checking,9metallogenic potential areas are separated in the research area,and the metallogenic potential areas are concentrated in 3 metallogenic belts.The Maojiadagou II metallogenic potential area is located in the cross part of 550gaodi-Ergenhe metallogenic belt and Mohe nappe metallogenic belt,and it is an important metallogenic target area with Au metallogenic prospect in the study area.The paper has 33 figures,29 tables,and 71 references.