Prediction Of Prospecting Target Area Of Hydrothermal Vein Type Pb-Zn Deposit By Remote Sensing In Adrasman-Kanimansur,Tajikistan

The proposal of"One Belt and One Road"strategy has expanded the space for Xinjiang geological exploration and ore prospecting.Central Asian countries along the route are rich in mineral resources,Tajikistan has one of the world's largest reserves of metallic ore.Its reserves and output are among the top in the world,attracting worldwide attention.Xinjiang and Tajikistan are linked together,have the same ore-forming geological background,by analyzing and summarizing foreign lead-zinc metallogenic conditions and geological features,with the aid of remote sensing prospecting information analysis,develop metallogenic prediction of regional lead-zinc deposits,it is expected to provide reference for the prospecting of the central Tianshan lead-zinc deposit.It provides good technical support for the implementation of"going out"strategy of mineral exploration in Xinjiang,and data support for overseas risk explorationIn this paper,the Adrasman-Kanimansur lead-zinc ore field near the Tajikistan-Uzbekistan border in Taboshal region of Tajikistan is taken as the research area.Tectonically,it belongs to the middle Tianshan metallogenic belt,the Qiatkar River metallogenic subbelt.Nine deposits have been found in the ore field,such as Kanimansur Pb-Zn deposit and Zambarak Pb-Zn deposit,which is an important regional medium-temperature hydrothermal vein Pb-Zn deposit concentration area.The Kanimansur and Zambarak lead-zinc deposits are the model areas for this remote sensing information extraction.The aim of this study is to establish the remote sensing geological prediction model of the hydrothermal vein type lead-zinc deposit in the study area on the basis of comprehensively and systematically summarizing the metallogenic geological elements,ore-controlling conditions and prospecting indicators of the model area.Fully excavate the mineralization related information of ASTER and Resource No.1 02D remote sensing datas,construct a complete set of remote sensing technology and method combination suitable for extracting the key metallogenic elements information of hydrothermal vein type lead-zinc deposit,and delineate the prospecting target area.The main achievements achieved:1.Based on previous achievements,it is considered that the main deposit type of Adrasman-Kanimansur metallogenic belt is hydrothermal vein type lead-zinc deposit.It is considered that the structure is the main ore-controlling factor,and the NE-trending structure is the most favorable for lead-zinc ore mineralization.The NE-trending regional structure is the ore-guiding structure,and the NE-trending secondary parallel structure is the ore-bearing structure.Carboniferous volcanic rocks are the important strata of lead-zinc deposits and provide rich mineral sources for them.Carbonization and pyritization are the important alteration types of regional lead-zinc deposits.Barite is often produced with sulfide such as galena and sphalerite.It is considered that barite vein is an important prospecting indicator.2.Using remote sensing technology,based on ASTER and Resource No.1 02D remote sensing datas,use band combination and direction filtering algorithm,the linear information of secondary structure is extracted.It is considered that the structural trend of the study area is mainly NE direction distribution,and the compression(torsion)fault is the main metallogenic structure;3.Principal component analysis(PCA)was used to extract the anomaly information of iron staining,CO₃^2-and Mg-OH mineralization alteration related to mineralization,and it was found that the known lead deposit(point)was consistent with the second-order carbonate anomaly;The main alteration information of Zambak Pb-Zn deposit is first-order iron stain information and first-order CO₃^2-.The spatial distribution of alteration anomaly information extracted in this study has the characteristics of vertical zoning,and has a good relationship with lead-zinc ore points,indicating high reliability;4.Combined with the analysis of regional lead-zinc geological and metallogenic conditions,the remote sensing prospecting markers and prospecting models of the study area are established,and each element is classified according to its category;According to the trinity of geological elements of"structure+alteration+gangue minerals"in the study area,6 target areas were delineated,including 1 A grade,2 B grade and 3 C grade,and the metallogenic potential of the target area was preliminarily analyzed.