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毛断铅锌多金属矿床位于浙西南江山-绍兴断裂和政和-大埔断裂间的隆起区,为区内代表性的铅锌多金属矿床之一.应用Re-Os同位素定年方法对该矿床5件辉钼矿样品进行了成矿时代测定,获得辉钼矿Re-Os同位素模式年龄为(138.6±2.0)Ma～(140.0±1.9)Ma,等时线年龄为137.7±2.7Ma(MSWD=0.7),模式年龄加权平均值为139.0±0.8Ma(MSWD=0.5).该年龄与毛断隐伏岩体成岩时代相吻合,表明成矿与成岩关系密切.辉钼矿Re-Os年龄的精确厘定,表明毛断铅锌多金属矿床为早白垩世初期华南岩石圈伸展背景下的产物.同时结合前人同时代的W、Mo、Pb、Zn等矿床的研究成果指出140±7Ma可能为华南另一重要的成矿时限.
The Maowu Pb-Zn polymetallic deposit is one of the representative Pb-Zn polymetallic deposits in the Jiangshan-Shaoxing fault and uplift area between the Zhenghe-Dabu fault in the southwestern Zhejiang Province. The Re-Os isotopic dating The molybdenite samples were determined for the metallogenic epoch. The Re-Os isotopic pattern age of molybdenite was (138.6 ± 2.0) Ma ~ (140.0 ± 1.9) Ma and the isochron age was 137.7 ± 2.7Ma (MSWD = 0.7 ), With a mean age of 139.0 ± 0.8Ma (MSWD = 0.5) .The age coincides with the diagenetic age of the capped volcanic rocks, indicating that there is a close relationship between mineralization and diagenesis.The precise determination of Re-Os age of molybdenite, The results show that the Maozuo Pb-Zn polymetallic deposit is the product of the early Early Cretaceous lithospheric extension in South China.According to the research results of previous W, Mo, Pb and Zn deposits, 140 ± 7Ma may be another Important metallogenic timeline.