江西雅山和下桐岭钨矿床辉钼矿Re-Os年龄及其地质意义  

Re-Os isotopic ages of molybdenite from Yashan and Xiatongling Tungsten deposit and its geological implications, Jiangxi Province,South China

作　　者：易先奎 李晓峰[2] 王翠云[3] 谢贤超 张桃然 胡倩 

机构地区：[1]江西有色地质勘查三队,江西新余338000 [2]中国科学院地质与地球物理研究所,北京100029 [3]广西区域地质调查研究院,广西桂林541003

出　　处：《华南地质与矿产》2015年第4期384-390,共7页Geology and Mineral Resources of South China

基　　金：国家自然科学基金项目(41272112);国家基础研究发展规划项目(2012CB416705)

摘　　要：雅山钨矿（W-Mo）和下桐岭钨钼铋铍矿（W-Mo-Bi-Be）是江西武功山地区典型的石英脉型钨矿床，二者的成矿元素组合略有差异，但二者的成矿时代是否存在差异尚不十分清楚。为了确定二者成矿年代，通过选取雅山钨矿和下桐岭钨矿石英脉中与黑钨矿伴生的辉钼矿进行了Re-0s同位素定年，获得了雅山钨矿3个辉钼矿Re-Os同位素等时线年龄和模式加权平均年龄分别为156．0±2,118Ma和156．0±2．4Ma；下桐岭钨矿4个辉钼矿Re-0s同位素等时线年龄和模式加权平均年龄分别为156．4±8．7Ma和156．1±201Ma；在误差范围内，说明二者的成矿时代基本一致。研究表明，雅山钨矿和下桐岭钨矿床与武功山地区浒坑钨矿成矿年代一致，与华南地区大规模钨锡成矿作用的时代基本一致（170～150Ma），均形成于晚侏罗世。The Yashan W-Mo and Xiatongling W-Mo-Bi-Be quartz-vein deposit is located in Wugongshan area,Jiangxi Province, South China. Three molybdenite samples and four molybdenite samples associated with wolframite in quartz vein in Yashan deposit and Xiatongling deposit, respectively, were collected for Re-Os isotope dating. The results show that the samples from Yashan yield isochron age of 156.0±2.8 Ma and weighted average model age of 156.0±2.4 Ma, the samples from Xiatongling deposit yield isochron age of 156.4±8.7 Ma and weighted average model age of 156.1±2.1 Ma.These ages data indicated that the Yashan and Xiatongling deposit formed in Late Jurassic, similar to Hukeng tungsten deposit in the area. Although the Yashan and Xiatongling deposit have different metal association, they formed almost synchronous in the Late Jurassic lithospheric extensional tectonic setting.

关 键 词：雅山钨矿床 下桐岭钨钼矿床 石英脉型钨矿床 RE-OS同位素 江西武功山地区 

分 类 号：P618.67[天文地球—矿床学]