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将军寨钨矿是湘东南白云仙矿田中一个典型的石英脉型黑钨矿床。岩石学和岩石地球化学研究表明,将军寨钨矿花岗岩体为一复式岩体,是同源岩浆演化的产物,具有壳源花岗岩的特征。文章研究了白云仙矿田将军寨钨矿花岗岩的地球化学特征,并进行石英脉型黑钨矿石中辉钼矿的铼-锇同位素定年,以精确厘定将军寨钨矿的形成时间,揭示湘东南地区钨、锡等有色金属成矿的时限及其地球动力学背景。铼-锇同位素定年结果表明,辉钼矿中铼的含量偏低,表明将军寨钨矿的成矿物质来源可能是以上地壳为主。4件辉钼矿样品的铼-锇同位素模式年龄为(151.3±2.5)Ma～(163.6±2.3)Ma,其等时线年龄为(169.6±2.7)Ma,这表明将军寨钨矿形成于燕山早期,为华南中生代大规模成矿作用的产物。
General military walled tungsten ore is a typical quartz vein type wolframite in the Baiyunxian orefield in southeastern Hunan. Petrology and geochemical study show that the Jiangjunzhai tungsten granite is a complex rock mass, which is a product of the evolution of the same magma and has the characteristics of crust source granite. In this paper, the geochemical characteristics of the granite of the Tongjunzhai tungsten deposit in the Baiyunxian ore field are studied, and the rhenium-osmium isotopic dating of the molybdenite in the quartz vein type wolframite ore is conducted to accurately determine the formation time of the Tongzhai tungsten ore, Time Limit and Geodynamic Background of Non-ferrous Metallic Ores in Tungsten, Tin and Other Regions. The results of rhenium-osmium isotope dating indicate that the rhenium content in molybdenite is low, indicating that the source of metallogenic material of the Tongzhai tungsten ore may be dominated by the above crust. The rhenium-osmium isotope ages of the four molybdenite samples ranged from (151.3 ± 2.5) Ma to (163.6 ± 2.3) Ma with an isochron age of (169.6 ± 2.7) Ma, indicating that the Tongjunzhai tungsten deposit was formed in Yanshan Early, for the South China Mesozoic large-scale mineralization product.