江西省崇义县淘锡坑钨锡矿床流体包裹体特征及矿床成因

为研究赣南淘锡坑钨锡矿床的成矿物理化学条件和流体来源，对不同中段黑钨矿-石英脉矿体中包裹体进行了岩相学、显微测温、激光拉曼探针和氢、氧同位素分析。岩相学观察和显微测温表明：该矿区发育气相包裹体、液相包裹体、富液相包裹体、富气相包裹体、含液相CO₂的三相包裹体等5种类型原生包裹体；存在2个流体演化阶段，即早期硅酸盐-氧化物成矿阶段（310～390 ℃）和晚期氧化物-硫化物成矿阶段（180～270 ℃）。7个典型包裹体的气相和液相激光拉曼探针成分分析显示：包裹体中气相属富含CO₂的NaCl-H₂O系列，液相属贫CO₂的NaCl-H₂O系列。5件黑钨矿-石英脉矿石中石英流体包裹体的δD为－64‰～－79‰，δ¹⁸O水为5.51‰～6.53‰，表明成矿流体来源于深部岩浆水。结合区域最新研究成果，认为该矿床属与陆壳改造型花岗岩有关的岩浆热液型钨矿床。

Fluid Inclusions Characteristics and Ore Genesis of Taoxikeng Tungsten and Tin Deposit in Chongyi County, Jiangxi Province

Based on the analysis of fluid inclusions(including the laser Raman spectroscopy),hydrogen and oxygen isotope in the quartz grains formed in different metallogenic stages,ore-forming physical-chemical condition and ore genesis of the Taoxikeng tungsten and tin deposit in southern Jiangxi Province have been summarized.Such five types of fluid inclusions are identified as gas,liquid,liquid-rich two-phase,gas-rich two-phase and three-phase with liquid carbon dioxide.According to characteristics of ore-forming fluid,two metallogenic stages are indicated: the early silicate-oxide stage(310-390 ℃) and late oxide-sulfide stage(180-270 ℃),respectively.Laser Raman spectroscopy of seven inclusions shows that the gas-phase in the inclusions belongs to the NaCl-H2O series rich in CO2,and the liquid-phase to the NaCl-H2O series poor in CO2.The δD values in inclusions from five samples change from-64‰ to-79‰,and δ18Owater from 5.51‰ to 6.53‰,which indicates that the ore-forming fluid was derived from the deep magmatic water.According to data mentioned above and from other research in this area,it can be concluded that the Taoxikeng deposit belongs to the magmatic hydrothermal tungsten and tin deposit associated with the S-type granite.