LA-ICP-MS Zircon U-Pb Age of Geneiss from Gaoligong Mountain Group on the Southeastern margin of Tengchong Lock in Western Yunnan Province

详细信息   

• 责任者：Lin Shiliang (Chengdu Institute of Geology and Mineral Resources ; China Geological Survey ; Chengdu 610082 ; China) ; Cong Feng
• 刊名：Geological Bulletin of China
• 出版年：2012
• 卷期：31(2)
• 关键词：片麻岩 ; gneisses ; 铀—铅计时 ; U-Pb dating ; 云南 ; Yunnan Province
• 页码：p.258-263
• 图表：3 illus., 1 table, 7 refs.
• 分类号：0802
• 出版序号：20130159
• issnNo：ISSN1671-2552
• isbnNo：CN11-4648/P

摘要

Gaoligong gneiss from southeastern Tengchong block has experienced multistage metamorphism, and hence shows evident anatexis and mylonitization. 14 of the 15 zircon points yielded ²⁰⁶Pb/²³⁸U age of (454.4～546.7) Ma, with the average age of 489Ma±16 Ma. The result suggests that the Gaoligong Mountain Group in southeastern Tengchong block underwent intense regional meta- morphism including migmadzation in Early Paleozoic, which reflected the Pan-African event in the Tengchong block.