Distribution Characteristics And Metallogenic Regularity Of Pb-Zn-Mo Polymetallic Deposits In Yuku Area Of Luanchan

The Luanchuan ore cluster is located in the area where the North Qinling Orogenic belt combines with the south margin of the North China Craton.The basic tectonic framework is distributed in the NW-EW direction,strong magmatic activities are developed,especially in terms of the intermediate-acid porphyry metallogenic system.Luanchuan ore cluster is the core ore-forming area of the East Qinling Orogen.It is not only one of the largest Mo ore reserves in China,but also rich in Pb-Zn ore resources.In recent years,great progress has been made in the exploration of hidden deposits in Yuku area in the SE of Luanchuan.However,there is lack of systematic study on the spatial and temporal distribution of Pb-Zn-Mo polymetallic deposits and in-depth understanding of the distribution rules of Pb-Zn-Mo polymetallic deposits.Based on the previous work results collected in Yuku area of Luanchuan ore cluster in this study,the borehole profile shows that in the study area is from old to new with granite in late Jurassic as the center,the direction of Dongyuku porphyrist-skarn type Mo-W ore body in the central belt is in the NW direction,with a "concave bucket" distribution.Mineralized bodies mainly occur in the inner and outer contact zone of the porphyry body,and Mo ore body is generally distributed below the W ore body.The Yuku-skarn Zn deposit in the transition zone is stratified and controlled by the strata.The marginal belt is the hydrothermal vein-type Pb-Zn-Ag deposit in Yindonggou area.The borehole and CSAMT interpretation were used to predict the morphology of the buried granite top interface and to infer that the emplacement of the rock mass from the NE direction to the SW direction has a trend from shallow to deep,and the occurrence also gradually becomes slow,the position of the Pb-Zn ore was relatively shallow,and the spatial distribution rule of the Pb-Zn-Mo polymetallic deposit distributed below the Pb-Zn ore was Mo-W ore.In the view of the close spatial relationship between deep-buried granite and Pb-Zn ore in Yuku area,this study selected samples HSM and ZYK in Dongyuku for zircon U-Pb dating,and the results were 148.17±0.91 Ma and 149.7±1.60 Ma,respectively,combined with the previous data,it can be known that the metallogenic time of Dongyuku Mo-W deposit in the central belt is the earliest,then it is the Yukuskarn type Pb-Zn deposit in the transition zone,and it is the metallogenic age rule of Yindonggou hydrothermal vein Pb-Zn-Ag deposit in the edge belt.According tothe close relation of time and space between temporal distribution of Pb-Zn-Mo polymetallic,the metallogenic model map of Yuku area in Luanchuan is obtained,which has certain enlightenment significance for deep prospecting in Luanchuan area.