Geological Characteristics And Prospecting Prediction Of The Haobugao Lead-zinc Polymetallic Deposit In Chifeng City,Inner Mongolia

The study area is located in Bahrain Zuoqi,Inner Mongolia,and is the Hualixi fold belt uplift area in the middle and southern end of Daxing'anling.The structure and magmatic intrusion activities in the area are frequent and have good metallogenic conditions.In this paper,the petrology and ore geochemistry of the Haobugao lead-zinc polymetallic ore were studied in detail,and the prospecting prediction theory proposed by Yetianzhu was used to find the periphery of the Haobugao lead-zinc polymetallic ore.The mine forecast puts forward the following understanding of the genesis of the Haobu high-lead-zinc polymetallic deposit:1.The Haobugao lead-zinc polymetallic deposit occurs in the contact position of the Cretaceous acid intrusive rock and the Dashizhai group of the Dashizhai Formation.It is a typical skarn deposit,and its distribution is mainly affected by the distribution of marble belt.The fold fault develops in the mining area,and its NE-trending fault is the main metallogenic structure,which is the main metallogenic structure.The ore structure is mainly metasomatic structure,interstitial structure,semi-self-shaped-self-shaped structure,etc.The main ore structure It is a mass,a disseminated structure,a vein structure,and the like.2.The development of magmatic rocks in the study area,the rock mass related to the formation of the Haobugao deposit is the Xiaohanshan complex.The lithology is more complicated.It is found that the distribution of trace elements in the Xiaohanshan complex is related to the distribution of deposits in the area.Different lithologies have different ore-forming properties.The quartz feldspar(K_1???)has Cu and W.Mineralization specificity;granite(K_1?)has properties such as Sn,As,W,Mo,Ag,Bi,Cu,Pb,Zn and other non-metallic mineralization such as fluorite and crystal;biotite granite(K_1??)Has the mineralization specificity of W,C,Ag.3.Through the analysis of the uniform temperature data of fluid inclusions,the temperature of the main mineralization stage of the Haobugao lead-zinc polymetallic ore is medium-high temperature hydrothermal fluid.From the early stage ofmineralization to the late stage of mineralization,the temperature gradually decreases and the salinity increases.The ore-forming pressure is mostly concentrated at500-1000 bar,which has a decreasing trend in the later stage of mineralization.4.Through the analysis of the sulfur and lead isotope data of the samples in the Haobugaogao zinc polymetallic ore.Sulfur indicates that the ore-forming material is derived from magma and conforms to the characteristics of the source sulfur.By analyzing the lead isotope in lead and potassium feldspar in the metal sulfide,the ore-forming and diagenetic materials have the same source,which is the crust-mantle mixed magma.Through the analysis of hydrogen and oxygen isotope data,the ore-forming fluid is mainly magmatic water in the early stage,followed by atmospheric water.5.By collecting the age of diagenesis and the formation time of the ore deposit of the Haobugao lead-zinc polymetallic ore body,the formation of magmatic rocks is similar to that of the ore deposits,which are formed in the Early Cretaceous and belong to the late Yanshanian active products.