• 责任者：He Shiping (Xi’an Institute of Geology and Mineral Resources ; Xi’an 710054 ; China) ; Li Rongshe
• 刊名：Geology in China
• 出版年：2012
• 卷期：39(1)
• 关键词：变质岩 ; metamorphic rocks ; 冈底斯山 ; Gangdise Range ; 青藏高原 ; Qinghai-Tibetan Plateau
• 页码：p.21-28
• 图表：4 illus., 2 tables, 18 refs.
• 分类号：0802
• 出版序号：20130157
• issnNo：ISSN1000-3657
• isbnNo：CN11-1167/P

The formation age of Jiaoyuqiao Group, i.e., the metamorphic rocks in the northern margin of Gangdise, is still in controversy. High resolution LA-ICP-MS in situ U-Pb analysis was conducted for the intercalation of garnet-bearing green schist in marbles of upper Jiayuqiao Group at Bajian Village, Baxoi County, Tibet, and an upper intercept age of (566±27) Ma was obtained. The result cinfines the formation age of the Jiaoyuqiao Group to Late Sinian. Combined with related data, the authors hold that there existed a large continental margin rift in the northern margin of Gangdise in Late Sinian-Cambrian period.