Integrated Information Prognosis Of Gold Sliver Polymetallic Deposit In The Ni'erji Area,northern Great Xing'an Range

The study area is located in the northern Great Xing'an Range on the southeastern margin of the Siberian Plate and the southeastern margin of the Xing'an Block.It is located in the Dongwuqi-LizishanDuobaoshan metallogenic belt on the east slope of the northern Great Xing'an Range.The area has experienced many important tectonic events,such as the Paleo-Asian Ocean tectonic system,the Mongolia-Okhotsk Ocean tectonic system and the Paleo-Pacific tectonic system.Magmatic activities occur frequently near the orogenic belt.Complex tectonic evolution and multi-stage magmatic intrusion activities have created favorable metallogenic geological conditions in this area.It has become an important non-ferrous and precious metal mineral area in China and has good metallogenic potential.Based on the theory of comprehensive information prediction and prediction,taking the Ni'erji area as the scope,this paper makes a comparative study with the typical gold deposits developed in the region.Combined with the research results of metallogenic regularity in the northern part of the Great Xing'an Range,the geological,geophysical and geochemical data are systematically analyzed and processed,the geological metallogenic conditions and prospecting criteria are summarized,and the comprehensive information mineral prediction model is established to further indicate the prospecting direction of gold deposits.The study area mainly exposed the strata of Manketou'ebo and Ganhe Formation,developed nearly NS and NE structures,and gold and silver mineralized bodies have been found.It has been found that the rock mass mainly occurs in the Manketou'ebo Formation and its structural fracture zone,and the orecontrolling structures are mainly NE and NNE.The wall rock alteration changed into silicification?sericitization and chlorite,showing the characteristics of medium-low temperature alteration.The ore body characteristics of the study area are similar to those of Yongxin gold deposit,and belong to epithermal vein deposits.Based on the comprehensive information interpretation of 1 : 10000 soil geochemistry in the study area,it is determined that Au,Ag and other elements are the main metallogenic elements.The standard deviation,variation coefficient and concentration Clark value of elements are high.The metallogenic element combination is Au-Ag-Hg,and the high value area is widely distributed.According to the factor loading characteristics of metallogenic elements,the study area has a good geochemical indicator of epithermal deposits,and the mineralization has the characteristics of multi-stage and multi-stage superposition.At the same time,through data processing,a total of 30 Au and Ag anomalies are delineated.Among them,Au-2,Au-7,Au-8,Ag-4,Ag-9,Ag-10 and Ag-13 anomalies have high intensity,large contrast and obvious concentration center,and have good prospecting potential.According to the relationship between elements,four assemblage anomalies are delineated.Among them,Ht-1 and Ht-3contain single element anomalies with excellent prospecting significance such as Au-2 and Ag-4,which are important geochemical prospecting indicators in the study area.The magnetic field distribution in the study area has the characteristics of ' negative in the middle and positive around '.The negative field is consistent with the Jurassic strata,and the positive field is distributed around and partially sporadically.According to the polarization,extension and structural analysis of high magnetic data,9 annular structures and 25 linear structures are interpreted.The basic structural pattern of the study area is mainly composed of linear structures in NE,near NS and NW directions.The intersection of positive and negative magnetic anomalies and the intersection of different types of structures are important magnetic prospecting marks in the study area.The results of IP intermediate gradient measurement show that the study area has the characteristics of high apparent resistivity in the central part,low apparent resistivity on both sides,and high and low apparent polarization.The low resistivity and high polarization area is the prospecting indicator of electrical prospecting.Based on geological,geophysical and geochemical data,a comprehensive information mineral prediction model is established.In the study area,two grade II prediction areas and one grade III prediction area are delineated,and two prospecting targets are optimized,which provides scientific direction for further prospecting and exploration.