Geological Characteristics And Metallogenic Prediction Of Silver Polymetallic Mineralization In Keyouqianqi Area Inner Mongolia

The study area is located in tianshan-xing monte slot?I?,in central Inner Mongolia geosynclinal fold system?II?and right flag late variscan geosyncline fold belt?II ₄?north eastern zhe si-linxi synclinorium?II₄¹?in the north east,belongs to the sudden spring-the linxi variscan,yanshan epoch?tin?of iron,copper,lead,zinc,silver,niobium,tantalum)class B metallogenic belt??-6?.Late Paleozoic-Mesozoic tectono-magmatic activity is strong.The ore-forming geological condition of this area is superior and it has a good prospecting prospect.Based on the full collection and analysis of previous data,this paper comprehensively analyzed the geological,geochemical,geophysical and remote sensing data of the study area,combined with the regional metallogenic background,compared the research results of typical ag polymetallic deposits in the area,established a metallogenic prediction model,and delineated two ag polymetallic metallogenic prospective areas.The metallogenic potential and prospecting prospect in the prospective area are objectively evaluated,which indicates the direction for further prospecting in the area.The strata in the study area were divided into 6 mapping units by the methods of 1?50 000 land,matter,chemistry and remote,among which the strata related to mineralization were mainly the middle Permian,dashizhai formation,followed by the late Jurassic manketou ebo formation,manitu formation and baiyin gaolao formation.The intrusive rocks were divided into three ages and 13 mapping units.All the endogenetic metallic ore?mineralization?points in the area were related to the intrusion,and the contact zone between the intrusive rocks and the host strata was most closely related to the mineralization.Fault structure and fold structure are developed in the area.1:50,000aeromagnetic delineation of 12 anomalies;The distribution characteristics of hydroxyl anomaly and iron stain anomaly were extracted from 33 mesh-like and ring-like structures by remote sensing interpretation.1:50,000 soil geochemistry delineated 30 comprehensive anomalies.1:10000 high-precision magnetic method delineated 6 abnormal high magnetic,1:10000 IP ladder delineated 5 abnormal apparent polarities;There were 38 anomalies in soil geochemical delineation assemblage.The abnormal soil assemblage was mainly composed of Ag,Mo,Pb,Zn,Cu,Sb and As.Based on the analysis of geology,geochemistry,geophysics and remote sensing characteristics of the study area,the paper studied the Maoxigaban and Dashizhai lead-zinc polymetallic deposit in the same metallogenic belt.Thinks that the metallogenic type of the silver-polymetallic deposit in keyou qianqi area is a hydrothermal deposit of medium and low temperature.The formation of silver-polymetallic mineralized bodies in the area is closely related to the fault structure and the activities of intrusive rocks in late variscan and yanshanian periods.The nw fault provides the migration channel for the hydrothermal solution and the nw fault provides the ore-bearing space.Magmatic hydrothermal fluid of late valesian and yanshan periods provided ore-forming elements,heat sources and driving force for ore-forming.Meanwhile,ore-forming elements in the strata of the Permian dashizhai formation,Jurassic baiyingaolao formation,manitou formation and manketou ebo formation were activated,migrated and partially enriched.The mineralization alteration related to silver polymetallic ore mainly includes chlorite,pyrite and silicification.The abnormal apparent polarizability is characterized by low resistivity and high polarizability.Magnetic field shows high magnetic anomaly;The characteristics of soil geochemistry showed that the elements,mainly Ag,Mo,Pb,Zn,Cu,Sb and As,were abnormal in combination,and overlapped with high magnetic anomaly,low resistivity and high polarization anomaly.The characteristics of remote sensing are the development of mesh-like structure and ring-like structure,and the development of iron stain alteration.According to the classification principles of metallogenic forecasting area,in the study area were delineated metallogenic prospect area 2,respectively,righteousness,force special grade Ag polymetallic?metallogenic prospect areas,found that the mineralization body 1,exploratory trench surface sampling analysis Ag grade 23.0×10^-6,93.0×10^-6 primary halos sample Ag content.Ha,ya vomit Mo,Ag,Au polymetallic?metallogenic prospect areas,found that the mineralization body 2,exploratory trench surface sampling analysis:Ag15.9×10^-6,Mo 0.05×10^-2.