Quartz-vein-type copper deposits were discovered in SN-trend ore-bearing structures in north-west Dayaoshan, Guangxi. Lack of reports on the precise metallogenic age of these deposit has become a bottleneck in metallogenic research in this area. In this study, the quartz vein-type copper mine in Longwei area of Jinxiu was selected as the research object. Fresh illite samples in the fault gouges and ore samples were collected for testing and analysis. Based on the Re-Os isotope dating study, the age of pyrite isochron, belonging to the Caledonian period, was determined to be 417 ± 25 Ma, whereas that of chalcopyrite isochron belonging to the Indosinian period, was found to be 243 ± 18 Ma. Pyrite crystallized considerably earlier than chalcopyrite. The obtained EPMA data were combined with rock mineralogical analysis data, Metasomatous mineral pyrite and metasomatic mineral chalcopyrite were identified to have originated from different hydrothermal systems. In the Indosinian period, copper deposits in the Longwei area underwent pyrite crystallization, pyrite fragmentation, copper-bearing hydrothermal filling, and metasomatism, consolidating and forming minerals. The study determined the mineralisation time and ore sources of copper deposits in the Longwei area. The study provides evidence for the existence of Indosinian hydrothermal activities in the north-western Dayaoshan area.

广西大瑶山西北部SN走向含矿构造中发现石英脉型铜矿床。缺乏该矿床精确成矿年龄的报道已成为该地区成矿研究的瓶颈。本研究选取锦绣龙尾地区石英脉型铜矿作为研究对象。采集断层泥中的新鲜伊利石样品和矿石样品进行测试和分析。根据Re-Os同位素测年研究，确定属于加里东期的黄铁矿等时线年龄为417±25 Ma，属于印支期的黄铜矿等时线年龄为243±18 Ma 。黄铁矿比黄铜矿结晶得早得多。将获得的EPMA数据与岩石矿物学分析数据相结合，交代矿物黄铁矿和交代矿物黄铜矿被鉴定源自不同的热液系统。印支期，龙尾地区铜矿经历了黄铁矿结晶、黄铁矿碎裂、含铜热液充填、交代作用，固结形成矿物。研究确定了龙尾地区铜矿床的成矿时间和矿源。该研究为大瑶山西北部地区印支期热液活动的存在提供了证据。固结和形成矿物质。研究确定了龙尾地区铜矿床的成矿时间和矿源。该研究为大瑶山西北部地区印支期热液活动的存在提供了证据。固结和形成矿物质。研究确定了龙尾地区铜矿床的成矿时间和矿源。该研究为大瑶山西北部地区印支期热液活动的存在提供了证据。