华南地质与矿产2016，Vol.32Issue(1)：15-20,6.DOI:10.3969/j.issn.1007-3701.2016.01.003
扬子东南缘高涧群底部锆石SHRIMP U-Pb年龄
Zircon SHRIMP U-Pb Age of Gaojian Group in the South-eastern Margin of Yangtze Craton
摘要
Abstract
Gaojian Group or Xiajiang Group which distribute in the south of Kaili - Huaihua - Xupu -Shuangfeng- Hengyang- Pingxiang and overstep in the motion interface of Wuling was formed in continental margin slopes- sedimentary basins. It also belongs to the different sedimentary phase in the same period of Banxi Group. But it still has no reliable age data obtaining directly from the bottom of Gaojian Group so far so that their time limit and their corresponding relation are difficult to confirm. By the sample analyzing of the volcanic breccia of Xuanwu-Anshanzhi in Shiqiaopu Formation Gaojian Group, the author gets that the SHRIMP U-Pb age of 828.8±9.6Ma, which is consistent with the SHRIMP U-Pb age of 824 ± 9 Ma of layered basalt from the bottom of Huashan Group in Hubei. So we can infer that the shifting time from the ending of the Wuling Orogeny to the starting of rifting function in the evolution process of southeastern margin of Yangtze may be about 830 Ma. It pro-vided strong evidence for the basin evolution in the southeastern margin of Yangtze and the sequence overriding the model of wedge formation from southeast to northwest successively.关键词
同位素年龄/玄武-安山质火山角砾岩/石桥铺组/高涧群/扬子东南缘Key words
SHRIMP U-Pb age/Basaltic-andesitic volcanic breccias/Shiqiaopu Formation/Gaojian Group/Southeastern margin of the Yangtze Craton分类
地质学引用本文复制引用
罗来,贺良,孙海清,黄建中..扬子东南缘高涧群底部锆石SHRIMP U-Pb年龄[J].华南地质与矿产,2016,32(1):15-20,6.基金项目
国家自然科学基金重点基金资助项目“华南新元古代‘楔状地层’沉积充填系列及其大地构造属性研究”（编号41030315）、中国地质调查局项目“华南板溪群地层划分及岩相古地理研究”（编号:1212011121108）、中国地质调查局项目“湖南1∶5万铁丝塘、草市、冠市街、樟树脚幅区域地质矿产调查”（编号:12120114024101）资助 （）
