The Geological Characteristics Study And Metallogenic Prediction Of The Haobugao Pb-Zn-Cu Deposit In Inner Mongolia

The Haobugao Pb-Zn-Cu deposit is located in the north of Chifeng,Inner Mongolia.The unique geological structure makes the area have excellent mineralization conditions.In this paper,through the study of regional geological characteristics,ore deposit geological features,rock and ore deposit geochemical study in the Haobugao Pb-Zn-Cu deposit,we get the following understanding:?1?Through the analysis of the basic geological data,combined with field geological investigation and indoor rock and mineral thin film identification method.The northeastern tectonic structure is the main controlling rock and ore controlling structure in this area;and the ore bodies are mainly hosted in the skarn belt.The ore structure is mainly composed of crystal structure,solid solution separation structure and metasomatic structure.The ore structure mainly includes filling structure,metasomatic structure,etc.?2?Through the study of sulfur-lead isotope research in the samples collected from the Haobugao deposit,The ?³⁴S value of the sulfide shows the characteristics of the column distribution,that shows sulfur isotope fractionation basically achieve the balance in metallogenic period;the range of ?³⁴S values between-5‰⁰.6‰,with the average value of-1.48‰.That indicates the source of sulfur in ore deposit is relatively uniform,which means that the S may come from deep source magma,and has the characteristics of mantle source sulfur.?3?The characteristics of the isotopic composition of lead in the Haobugao deposit is a low value of ? and ?,which indicates that the ore lead is derived from the source region of rich thorium and depleted uranium,with source mantle characteristics on the whole,and there is a small amount of the earth's crust lead contamination in the process of the ore deposit formation.Through the comparative analysis of potassium feldspar in Pb isotope compositions indicate that the diagenetic and metallogenic material of Haobugao deposit may have the same source,they are all from the orogenic belt and the mantle.?4?The studies of H-O isotope suggest that the ore-forming fluids come from magmatic water and mereoric water.The ore-forming hydrothermal fluids in the mining area are dominated by magmatic hydrothermal fluids,and during the later period,it is mainly by mereoric water.?5?The study of metallogenic regularity shows that the formation of the Haobugao deposit is constrained by the strata,tectonics and magmatic rocks.Under favourable strata,the ore bearing magmatic water and gas hydrothermal fluid accumulated in the favorable position?interlayer fracture of marble or the collapsed part of axis?through magmatic metasomatism.The prospecting prediction model of Haobugao deposit is helpful to the prospecting of mine prospecting,and it is better to find polymetallic minerals in the northeast tectonic belt.