| Tibet mengya'a lead-zinc deposit is one of important lead-zinc deposits in the Gangdese metallogenic belt of Tibet eastern territory.In this paper,based on mineragraphy study theory,by collecting and analyzing the data of predecessors,preparing and observing 56 samples,carrying out the necessary extension test,studying the general characteristics of mineragraphy and sphalerite Mineralogical characteristics: 1.Basically found out the mineral composition of the mining area,mostly for metal sulfide.There're pyrrhotite,greigite chalcopyrite,pyrite,sphalerite,bismuthinite,marcasite,stannite,gratonite.Mineralization are closely related with magmatic hydrothermal solution and silicon card lithified.2.Mengyaa mineral has species diversity,associated complex Mineral,low sulfur minerals and high sulfur minerals,sulphosalts and simple sulfides mixed,sphalerite formed under different temperature environment mixed,sphalerite solid solution separation structure formed under different temperature mixed,indicates that the mineralization has multi period,and each stage of hydrothermal properties are different.3.Through the extension of the test,at least it can be divided into 18 kinds of ore-forming hydrothermal solution,and the different stages of the hydrothermal fluid composition is different,the dynamic strength of the different stages of the thermal fluid is different.4.Through the mineral with the characteristic of temperature,I calculated the metallogenic temperature of metal sulfide in the mining area is 100 C-550 C,and the metal sulfide mineralization temperature is more suitable.5.Sphalerite element Cd(Wt%)content and Zn/Cd ratio was significantly negative correlation,indicating the mengya'a lead-zinc deposit is skarn deposit.6.In summary,preliminary determination of deposit types.It is suggested that the deposit is a skarn type polymetallic deposit. |
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