LA-ICP-MS Zircon U-Pb Age of Metamorphic Basic Volcanic Rock in Gongyanghe Group of Southern Gaoligong Mountains, Western Yunnan Province, and Its Geological Significance

详细信息   

• 责任者：Yang Xuejun (Sichuan Institute of Geological Survey ; Chengdu 610081 ; China) ; Jia Xiaochuan
• 刊名：Geological Bulletin of China
• 出版年：2012
• 卷期：31(2)
• 关键词：变火山岩 ; metavolcanic rocks ; 铀—铅计时 ; U-Pb dating ; 高黎贡山 ; Gaoligong Mountains
• 页码：p.264-276
• 图表：6 illus., 3 tables, 8 refs.
• 分类号：0802
• issnNo：ISSN1671-2552
• isbnNo：CN11-4648/P

摘要

Gongyanghe Group is composed of epimetamorphic sandstone and shale. In this paper, the authors identified the stratigraphic sequence composed of several layers of metamorphic basic volcanic rock in Bangmai Village of Longling County. It is held that its original rock was basalt formed in an intra-continental tension environment and probably related to extension after the Pan-African orogenic period. The authors got the U-Pb age（499.2±2.1) Ma of zircon from metamorphic basic volcanic rock and thus provided a reliable chronological basis for the division of the Gongyanghe Group and the restriction of the age.