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赣南樟东坑钨矿具有典型的“上脉(黑钨矿石英脉)下体(蚀变细粒花岗岩)”和“上钨下钼”矿化模式,为了弄清黑钨矿石英脉与蚀变细粒岩体型矿化之间在成矿时间上的关系,对产于该矿细粒花岗岩中的辉钼矿和石英脉中的辉钼矿分别进行了Re-Os同位素定年.测试结果为:细粒花岗岩中的3件辉钼矿样品Re-Os等时线年龄为155.4±2.1Ma(MSWD=1.12),模式年龄154.9±2.6Ma~156.5±2.6Ma,加权平均年龄155.5±1.4Ma(MSWD=0.44);而石英脉中5件辉钼矿样品的Re-Os等时线年龄为154.6±1.7Ma(MSWD=0.030),模式年龄变化范围为154.2±2.3Ma~154.7±2.7Ma,加权平均年龄为154.29±0.98Ma(MSWD=0.045).上述结果表明,花岗岩体型矿化与石英脉型矿化的年龄在误差范围内高度一致,从而证明了岩体中的钼钨矿化与石英脉中的钨钼矿化为同一次岩浆热液矿化事件的产物.
The southern Jiangxi Zhangdongkeng tungsten deposit has the typical mineralization pattern of “upper veins (wolframite vein) lower body (altered fine granite)” and “upper and lower tungsten molybdenum” The relation between the mineralization time of the British vein and the altered fine-grained rock is related to the ore-forming time. The Re-Os isotopes The results showed that the Re-Os isochron age of three molybdenite samples in fine-grained granite was 155.4 ± 2.1Ma (MSWD = 1.12) and the model age ranged from 154.9 ± 2.6Ma to 156.5 ± 2.6Ma. The weighted average age 155.5 ± 1.4Ma (MSWD = 0.44). The Re-Os isochron ages of 154 molybdenum-molybdenite samples in quartz vein were 154.6 ± 1.7Ma (MSWD = 0.030), and the age range of the model was 154.2 ± 2.3Ma-154.7 ± 2.7Ma and the weighted average age was 154.29 ± 0.98Ma (MSWD = 0.045). The above results show that the ages of granitoid mineralization and quartz vein-type mineralization are highly consistent within the error range, which proves that molybdenum tungsten Mineralization and quartz vein in tungsten and molybdenum mineralization into the same magmatic hydrothermal mineralization event.