• 责任者：Zhou Bin (Jiangxi Province Mineral Resources Co. ; Nanchang 330030 ; China) ; Zheng Youye
• 刊名：Geological Bulletin of China
• 出版年：2013
• 卷期：32(11)
• 关键词：变火成岩 ; metaigneous rocks ; 柴达木盆地 ; Qaidam Basin
• 页码：p.1728-1736
• 图表：6 illus., 2 tables, 29 refs.
• 分类号：0802
• issnNo：ISSN1671-2552
• isbnNo：CN11-4648/P

     Precambrian rocks are widely distributed in the northern margin of the Qaidam Basin. In order to determine the influence of the early Paleozoic collisional orogeny on Precambrian rocks, the authors employed LA-ICP-MS technology to conduct zircon U-Pb dating. Biotite-plagioclase gneiss has ^206Pb/^238U metamorphic age of （479-472）Ma, amphibolite has two peaks of ^206Pb/^238U metamorphic age of 440Ma and 470Ma respectively, and garnet-amphibolite has ^206Pb/^238U metamorphic age of 418.8Ma±3.0Ma. Preliminary determination shows that there existed three times of influences of metamorphism on Precambrian rocks, i.e., thermal con- tact metamorphism of island arc granite at the late stage of oceanic subduction （495-467Ma）, regional metamorphism and thermal contact metamorphism of S type granite at the continental collision stage （467-423Ma） and I type granite thermal contact metamorphism at the post-collisional stage （423-371Ma）.