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盘古山钨矿是一个历史悠久、闻名国内外的大型矿床,为了厘定其岩浆活动及成矿作用时代,进而认识成岩与成矿关系、岩体内带与外带矿化关系及成岩成矿动力学背景,本研究采用LA-ICP-MS锆石U-Pb和ICP-MS辉钼矿Re-Os分析法分别对南岭2000 m科学钻探(SP-NLSD-2)所揭露的隐伏花岗岩体及其内带矿化石英脉进行了年龄测定。结果表明,隐伏花岗岩体形成于(161.7±1.6)Ma,内带矿化石英脉年龄为(155.3±2.8)Ma,均形成于中—晚侏罗世。盘古山钨矿床花岗岩浆活动与成矿作用的时代在误差范围内基本一致,矿化发育于岩体内外接触带,在空间上关系密切,并表现出花岗岩体→长石石英脉→石英脉的渐变演化关系,结合前人研究成果表明,矿化石英脉是花岗岩浆分异演化晚期的产物。岩体内带石英脉与外带石英脉的形成年龄吻合较好,形成于同一成矿作用。盘古山钨矿床及其隐伏花岗岩体均形成于165~150 Ma华南岩石圈伸展-岩体侵位-大规模成矿的动力学环境。
Pangunshan Tungsten Deposit is a large-scale mineral deposit with a long history and is famous both at home and abroad. In order to determine the age of its magmatic activities and metallogenesis, the relationship between diagenesis and metallogeny, the relationship between mineralization and mineralization and the mineralization of diagenesis In this study, LA-ICP-MS zircon U-Pb and ICP-MS molybdenite Re-Os analysis were used to study the concealed granite body exposed by SP-NLSD-2 at Nanling Its mineralized quartz vein with the age determination. The results show that the concealed granite was formed at (161.7 ± 1.6) Ma and the mineraliferous quartz veins (155.3 ± 2.8 Ma) were formed in the mid-late Jurassic. The age of granitic magmatism and mineralization in Pangushan tungsten deposit are basically the same within the error range. Mineralization develops in the inner and outer contact zones of the rock mass and is closely related in space. The granite body → feldspathic quartz vein → quartz vein According to the results of previous studies, the mineralized quartz veins are the product of the late stage of differentiation of granite magmatism. The formation age of quartz vein in the rock body coincides well with that of the quartz belt in the outer zone and formed in the same mineralization. The Pangushan tungsten deposit and its concealed granite bodies were formed in the kinetic environment of extensional-intrusive-mass mineralization of the South China lithosphere from 165-150 Ma.