| The Huangshanling Pb-Zn-Mo deposit is located in the Guichi Area of southern Anhui Province.It was considered to be a medium-sized Pb-Zn deposit in the early stage of exploration,and later discovered to be one large scale deep concealed Mo ore body.This paper,taking the deposit as the object,on the basis of previous works,through field and indoor comprehensive study,combined with rock main trace rare earth elements analysis,electron microprobe analysis,S,Pb and C-O isotope analysis,electron probe method and zircon U-Pb dating,comprehensively discussed the ore geological features,diagenetic mineralization,ore-forming geological conditions,deposit genesis and formation process of Huangshanling deposit.The achievements are as follows.The quartz diorite porphyrite and granite porphyry belong to the high potassium calcium alkaline series.It has the characteristics of Ectaic rock,such as lower Y,Yb content and higher Sr/Y and La/Yb.Its formation age is 137±1.5Ma,and is the result of the subduction of the ancient Pacific plate during the 152-135 Ma stage.And it comes from the effect of the crust and the mantle mixing.While granite porphyry has typical characteristics of type A granite rock,the rare earth fractionation of the rock mass is relatively significant,and the concentration of light rare earth is very obvious,the negative anomaly of pium is obvious.Its formation age is 125±1.2 Ma,and is the result of intraplate extension during the 127-123 Ma stage,this type of rock comes from the crust.There are three main types of ore texture,they are crystal grain,solid solution separation,and metasomatic texture.The structures of ore are basically the same,mainly consisting of massive structure,scattered,disseminated and veinlet-disseminated structures,and structure with visible stripes and spots in part.The Ore minerals are mainly molybdenum,galena,sphalerite,magnetite and pyrite,the mineralogical characteristics of sphalerite indicate that there are two phases of mineralization.The skarn minerals are mainly garnet,pyroxene and amphibole,the garnets are andradite-grossularite series,the pyroxenes are mainly Jo and Di,corresponding to the two phases of mineralization.According to ore body space distribution and diagenetic mineralization age,the metallogenic rock mass is granite porphyry.The quartz diorite porphyrite corresponds to the first phase of Pb-Zn mineralization,the intrusion of later granite porphyry formed the Huangshanling Pb-Zn-Mo deposit.The Huangshanling Pb-Zn-Mo deposit is a typical skarn deposit,from deep to shallow,the metallogenic temperature changes from high to low,and the metallogenic elements are transferred from molybdenum to lead-zinc mineralization.The metallogenic material mainly comes from the magma,and the wall rocks give some positive effect.The metallogenic fluid is the result of the combined action of magma water,stratum water and atmospheric precipitation,and the magmatic hydrothermal content is the largest.The deposit studied are formed by the combination of regional tectonics,stratum and magmatic rocks.The action of the three factors forms the Huangshanling Pb-Zn-Mo deposit. |
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