The results of stable isotope and fluid inclusion characteristics of Xiaolonghe tin deposit in Tengchong show that the 834Sv_CDT value is+5.0‰～+8.1‰,with an average of+6.33 ‰,which is consistent with the range of 834 Sv-CDT value(0 ‰～+5.7‰)of pyrite sulfur isotope of granite accessory minerals,indicating that granite magma water is the main ore-forming fluid,with high temperature,high salinity and high density characteristics.The inclusions are composed of two types of inclusions.Type Ⅰ is the gas-liquid two-phase inclusions of NaCl-H2O system.The volume of bubbles accounts for 5％-15％of the volume of inclusions.The inclusions are arranged in the quartz of each stage,and the cassiterite inclusions are only developed in the disseminated cassiterite stage of greisen type.Type Ⅱ is atmospheric liquid ratio inclusions,bubble volume accounts for 55％～65％,sub-angular isolated distribution,developed in quartz of greisen stage.From the greisen stage to the quartz vein stage to the late weak greisenization stage,the ore-forming fluid continues to evolve from high temperature and high salinity to medium-high temperature and medium-high salinity.It is a typical gasification-high temperature hydrothermal greisen type tin deposit.
Tin DepositStable IsotopeXiaolonghe Tin DepositTengchong,Yunan
NETL
NSTL
万方数据
