STUDY ON THE CHARACTERISTICS OF STABLE ISOTOPES AND FLUID INCLUSIONS IN XIAOLONGHE TIN DEPOSIT IN TENGCHONG
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
