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江西乐平塔前钨钼矿床位于下扬子板块南缘的“塔前-赋春”成矿带,近年找矿工作取得了重大突破,显示该成矿带具有极好的成矿地质条件和巨大的找矿潜力。本文利用ICP-MS对矿石矿物辉钼矿进行了Re-Os同位素分析,5个样品的模式年龄变化在160.8～163.4Ma之间,Re-Os同位素等时线年龄为162±2Ma(MSWD=1.7),表明矿床形成于中侏罗世晚期。通过对区域同类矿床的成矿年代对比发现,塔前-赋春成矿带中矿床的形成时间明显晚于其周边的德兴铜矿等矿床,且主要控矿构造也相差很大,其原因可能与不同时期的构造背景有关。
The Leping Tungsten-molybdenum deposit in Leping, Jiangxi Province is located in the “Tazian-Fuchun” metallogenic belt on the southern margin of the lower Yangtze plate. In recent years, a great breakthrough has been made in prospecting work, indicating that the metallogenic belt has excellent geological conditions for mineralization and Huge prospecting potential. In this paper, Re-Os isotope analysis of ore mineral molybdenite was carried out by ICP-MS. The five samples have a model age variation of 160.8-163.4Ma and a Re-Os isotope isochron age of 162 ± 2Ma (MSWD = 1.7 ), Indicating that the deposit formed in the late Middle Jurassic. By comparing the metallogenic ages of similar deposits in the area, it is found that the formation time of the deposits in the Tazian-Fuchun metallogenic belt is significantly later than that of the Dexing copper ore deposit in the surrounding area, and the major ore-controlling structures also differ greatly It may be related to the tectonic setting of different periods.