The Determination of the Age of Jiayuqiao Group in Northern Gangdise of Tibetan Plateau
详细信息
- 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
- 页码：p.21-28
- 图表：4 illus., 2 tables, 18 refs.
- 分类号：0802
- issnNo：ISSN1000-3657
- isbnNo：CN11-1167/P
摘要
DivSummary name="EnDivSummary">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.