• 责任者：He Shiping (Xi’an Institute of Geology and Mineral Resources ; Xi’an 710054 ; China) ; Li Rongshe
• 刊名：Acta Geologica Sinica
• 出版年：2012
• 卷期：86(6)
• 关键词：变质岩 ; metamorphic rocks ; 岩墙群 ; dyke swarms ; 铀—铅计时 ; U-Pb dating ; 青藏高原 ; Qinghai-Tibetan Plateau
• 页码：p.985-993
• 图表：illus., 2 tables, 19 refs.
• 分类号：0802
• issnNo：ISSN0001-5717
• isbnNo：CN11-1951/P

Whether the Jitang rock group in northern Qingtang,Qinghai-Tibet Plateau belongs to Precambrian metamorphite series has long been controversial, especially on the age of formation due to lack of effective isotopic age to restrict its age. High resolution LA-ICP-MS in situ dating yields the original rock U-Pb age of 965±55 Ma and 1 048.2±3.3 Ma for quartz-chlorite schist（the protolith is intermediate volcanic rocks） and greenschist（the protolith is intermediate-basic volcanic rocks） in Jitang rock Group, Taniantaweng mountains,respectively. This indicates the original rock of Youxi Formation of the Jitang rock group formed during the end of Jixian Period or early Nanhua Period. Meanwhile, the Youxi Formation of the Jitang rock group may represent the geological record of volcanicsm-sedimentation during the extension of early Rodinian supercontinent break.