滇东南富宁地区基性侵入岩及喷出岩时代  

The age of basic intrusive and extrusive rocks in Funing area, southeast Yunnan Province

作　　者：刘兵 李小军 关奇 陈棵 陈光艳 李维科 胡绍斌 张虎 俞赛赢 LIU Bing;LI Xiaojun;GUAN Qi;CHEN Ke;CHEN Guangyan;LI Weike;HU Shaobin;ZHANG Hu;YU Saiying(Yunnan Institute of Geological Survey,Kunming 650216,Yunnan,China)

机构地区：[1]云南省地质调查院,云南昆明650216

出　　处：《地质通报》2018年第11期2021-2031,共11页Geological Bulletin of China

基　　金：中国地质调查局项目<云南1:5万睦伦街等4幅区域地质矿产调查>(编号:12120114072701);<云南区域地质调查片区总结与服务产品开发>(编号:DD20160345-02);<云南1:5万那佐等4幅区域地质调查>(编号:DD20160020)

摘　　要：在滇东南富宁地区基性侵入岩、喷出岩较发育,前人将其划分为"半瓦型"侵入岩、"安定型"侵入岩和"龙康型"喷出岩3类,3类岩石普遍缺乏可靠的同位素年代学资料。在对富宁地区基性侵入岩、喷出岩进行区域地质调查的基础上,应用LAICP-MS技术对其进行锆石U-Pb测年,在半瓦型侵入岩和安定型侵入岩中分别获得了254.0±2.0Ma和244.2±4.4Ma的加权平均年龄,在龙康型喷出岩中获得251.9±3.0Ma和255.92±0.72Ma加权平均年龄。结合野外调查和综合研究,将富宁地区"安定型"侵入岩的时代界定于中三叠世,将"半瓦型"侵入岩和"龙康型"喷出岩的时代界定于晚二叠世。Basic rocks composed ofBanwa-type intrusive rocks, Anding-type intrusive rocks and Longkang-type exnusive rocks are well outcropped in Funing area, southeast Yuunan Province, but they lacked chronological information. Based on regional geological investigation in Funing area, the authors applied LA-ICP-MS tech to determining the U-Pb age of zircons from inn＇usive and extrusive basic rocks. The weighted averages of 254.0±2.0Ma and 244.2±4.4Ma were obtained from Banwa-type intrusive rocks and Auding-type intrusive rocks respectively, and the weighted averages of 251.9±3.0Ma and 255.92±0.72Ma were obtained from Longkang-type extrusive rocks. Combined with field geological survey and comprehensive research, the authors hold that the age of the Anding-type inn＇usive rocks should be Middle Triassic, and the age of the Banwa-type inn＇usive rocks and the Longkang-type extrusive rocks should be Late Permian.

关 键 词：滇东南 富宁地区 基性侵入岩 基性喷出岩 锆石U-PB年龄 

分 类 号：P588.12[天文地球—岩石学] P588.14[天文地球—地质学]