Geochemistry And Genesis Of Dasongpo Tin Deposit,Tengchong In Yunnan Province

Tin Deposit resources in China are very abundant. Tin deposits of China areaffected by the earth tectonic Obviously, often along specific tectonic parts showzonal distribution. Deposits relate to Granitoids, have varying degrees ofperformanced a variety of mineralization, a variety of material sources andMulti-phase characteristics.Yunnan is China’s major tin origin.the Dasongpo tin deposit, Tengchong inYunnan Province is a famous, typical Greisen-type tin Deposit in western Yunnan.In this article, based on the works,we study the Geological and geochemicalcharacteristics and genesis of deposit with Dasongpo tin deposit. On the basis ofreading and organizing a large number of tin-related literature, summarize thecharacteristics and genesis of tin deposits, and provide guidance for thetin-polymetallic deposit prospecting work.Main conclusions as following:(1) The tin deposit is strictly controlled by multiple geological elements, such astectonic movements, magmatism, regional faults.(2) The geochemical characteristics of deposit indicates that the Tengchong crusthas experienced too many cycles of substance differentiation and a variety of thermalpower, and tin and its solvent element concentrate. The tin element through thevarious stages of purification concentrat in the late stage, so that fine-grained biotitegranite in the late stages increase the tin abundance and become the tin granite.(3) Carbon, hydrogen and oxygen isotopes and inclusions indicates that theore-forming fluid was a complex fluid,mixed with high temperature and pressure,highsalinity,high-density magmatic water,connate water and precipitation.In summary, tin mineralization and granite of Dasongpo tin deposit in Tengchongare formed in Yanshan-Himalayan cycle, is particularly obvious in late Yanshanianand Himalayan early. The output of tin deposits Closely are relate to deep remeltingmagma Granites, the ore-forming hydrothermal fluids are depend on the magmaticwater, the ore-forming fluids mostly for high-temperature, high salinity, high-density.Greisen is characterized by tin Deposits, its mineralization surrounding rock is MainlyCarboniferous Meng Hung group, is typical of the gas into high-temperaturehydrothermal greisen-type tin deposits.