Application Of Geochemical Datum In Prospective Evaluation Of Gold Deposits In Eastern Heilongjiang Province

In Heilongjiang Province in the northeastern part of China,from the Late Archean to the present,the stratigraphic development is relatively complete,and the geological structure is developed,so the ore-forming conditions are excellent and it is the national key metallogenic belt.The study area is the eastern part of Heilongjiang Province and the northeastern part of Jilin Province.It is mainly composed of forest swamp area and impact plain area.The Xiaoxing'anling-Zhangguangcailing metallogenic belt included in the study area is located in the eastern part of the Central Asia-Xingmeng orogenic belt.The Ministry is the Sanjiang Plain.The gold deposits in the study area are rich.Since ancient times,it has been an important area for gold mining in China.Among them,there are 128 gold mines,54 gold gold mines and 74 rock gold mines.Through the “ Global Geochemical Benchmark Value Establishment ” project completed in 2012,the sampling data of the regions studied in this paper were selected,and the geochemical method was used to use the soil geochemical data as the basis,using the iterative method,weighting method,etc.Chemical data statistics method is used to analyze the geochemical characteristics of gold in the study area.MapGIS software is used to make geochemical maps,and the gold content anomaly area in the study area is obtained.The gold mines that have been discovered are compared to determine the accuracy of gold mine prediction.Sexuality,and finally scientifically evaluate the anomalous area to determine the prospecting area of the gold element.The study concluded the following conclusions:(1)The background average of the Au elements in the study area is slightly lower than the background average of the Au elements in the sediments of the national water system and the flood plains;(2)the distribution characteristics of the surface sample data and the deep sample data elements have There must be similarities and differences.The differences in geochemical landscapes will also affect the distribution characteristics of the elements.The Au elements in the study area are mainly concentrated in the forest marshes,while the enrichment in the alluvial plains is not obvious.(3)Projected gold deposits in the area to shallow geochemical maps and deep geochemical maps,respectively,and gold deposits in shallow and deep geochemical maps accounted for 70% and 62%,respectively,and found shallow data and Deep data comprehensive considerations will have a good indication effect on finding gold mines;(4)8 elemental gold element anomalies will be created by making elemental anomaly maps,and combined anomaly maps will be made based on Ag,As,Hg element anomaly maps,with reference to watersheds,The water system,the topography and other factors have identified six combined anomalous regions.(5)According to the method of geochemical data processing,comprehensively consider the abnormality,abnormal contrast,abnormal scale and the gold information discovered in the area for optimal evaluation of each group of anomalies,and innovatively introduce the concept of contribution rate.Optimize and delineate 6 prospecting areas.