| Sitai Haiquan Pb-Zn deposit is located in the Sailimu micro-block of the Western Tianshan Mountains.In recent years,Chinese geologists have made major prospecting breakthroughs in the Sailimu micro-block of the Western Tianshan Mountains in Xinjiang.Tuokesai deposit(Zn + Pb metal content is more than 100,000 tons),Haerdaban deposit(Zn + Pb metal content is more than 730,000 tons)and Sitaihaiquan deposit(Zn + Pb metal content is more than 680,000 tons)show that the Sailimu Pb-Zn,Cu-Mo metallogenic belt has the resource potential of super large Pb-Zn deposits,and the Sailimu micro-block will become an important Pb-Zn prospecting target area in Xinjiang,China.However,previous studies are mainly carried out at two-dimensional scale,focusing on the geological characteristics and genesis analysis of the deposit.The deep geological structure is not clear,and there is a lack of effective guidance for the deep exploration of the orebody.It is urgent to find out the deep resource potential of the Pb-Zn deposit,and provide technical support for the geological exploration and metallogenic prediction of the Sailimu Pb-Zn deposit.Taking Sitaihaiquan Pb-Zn deposit as the main research object,this paper discusses the key ore-controlling factors from the analysis of regional geological background and metallogenic geological conditions.Through the systematic collection of geological,prospecting engineering,remote sensing DEM,geophysical and other data in the mining area,the spatial database is constructed to lay the foundation for the establishment of three-dimensional geological model in the mining area.Through three-dimensional inversion and interpretation of gravity and magnetic data,the deep geological structure of the mining area is identified.The 3D geological model of the mining area is constructed by fitting with the geological bodies exposed by shallow exploration projects,and the 3D visualization of the mining area and exploration projects is realized.On this basis,the metallogenic geological conditions are analyzed,and the multi-source information synthesis method is used to superimpose the favorable factors of mineralization,and the prospecting target area of Sitaihaiquan Pb-Zn deposit is delineated below 1500 m,aiming to serve the continuous breakthrough of Pb-Zn prospecting in Sailimu area.The main understanding and achievements are as follows :(1)Summing up the previous results that the type of Sitaihaiquan lead-zinc deposit is sedimentary type.It is considered that the lead-zinc ore bodies occur in the Kusongmuqieke Group of Jixian System,Mesoproterozoic.The third lithologic section of Kusongmuqieke Group in Jixian System is an important horizon for lead-zinc ore production.Carbonate carbonate-fine clastic rock formation is the main ore-bearing formation,which provides a rich mineral source for lead-zinc ore.NW-NWW normal fault structure is most favorable for lead-zinc mineralization.Carbonation is an important alteration type of Pb-Zn mine.Surface sphalerite,galena ore body outcrops or ore translites in ore-bearing strata are the most direct signs for finding Pb-Zn ore bodies.(2)Based on the study of deposit characteristics and the summary of ore-controlling factors,in order to further understand the deep geological conditions of the Sitaihaiquan Pb-Zn deposit,the three-dimensional model of topography,strata,boreholes,faults,ore bodies and geophysics in the mining area is constructed,and the three-dimensional visualization expression of ore-bearing strata,ore-controlling faults,ore-bearing construction and spatial distribution of ore bodies is carried out,which lays the foundation for metallogenic prediction.(3)The magnetic field,gravity field and rock physical properties of the mining area are analyzed by magnetic method and gravity measurement combined with the geological conditions of typical deposits.Through three-dimensional gravity and magnetic inversion,the spatial distribution of key geological bodies and structures in the study area is determined.The high density anomaly value of gravity inversion is roughly consistent with the proven mineralized zone(ore body).Magnetic inversion considers that most areas are non-magnetic or weak magnetic,which is consistent with the magnetic susceptibility characteristics of common carbonate Pb-Zn deposits.(4)Based on the three-dimensional model of mining area,the ore-controlling factors of Pb-Zn mine are analyzed and extracted,and three deep target areas of Sitaihaiquan PbZn mine are delineated.Through the superposition analysis of metallogenic favorable factors such as F2,F3,F7 faults,the third lithologic section of Kusongmuqieke group of Jixian system and gravity high density anomaly by multi-source information synthesis method,three deep target areas of Sitaihaiquan Pb-Zn mine are delineated.From threedimensional space for further deep prospecting and rational mining and development of mines to provide a reference for the prediction of deep resources in the Sailimu Pb-Zn belt. |
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