地质通报2016，Vol.35Issue(5)：667-673,7.
藏北羌塘中部上二叠统-下三叠统天泉山组的建立及意义--对龙木错-双湖-澜沧江洋构造演化的指示
The establishment and significance of the Upper Permian-Lower Triassic Tianquanshan Formation in central Qiangtang, northern Tibet：The constraint on the tectonic evolution of Lungmu Co-Sh- uanghu-Lancang River area
摘要
Abstract
There exist extensive epimetamorphic rocks in Tianquanshan and Pingfengling of Gaize County. These rocks are mainly metamorphic complex sandstone, phyllite and some interlayered volcanic rocks which are metamorphic basalt and andesite. Due to the lack of fossils, their formation epoch is unknown. There exists interlayered andesite, and the authors obtained the 206Pb/238U age of andesite (251.4±2.4Ma) by LA-ICP-MS zircon U-Pb isotope dating. Combined with the 254Ma 206Pb/238U age obtained by Fan Ji⁃anjun in the region, it is confirmed that the epimetamorphic rocks in the region should belong to the Late Permian-Early Triassic rather than to the Zhangjin Formation held by the traditional opnion. Based on the profile measurement and regional correlation, the strata of Tianquanshan and Pingfengling along the shallow metamorphic rocks are redefined as the Upper Permian-Lower Triassic Tianquanshan Formation (P3T1t). The discovery and establishment of Tianquanshan Formation (P3T1t) not only further improve the regional stratigraphic system but also provide the first oceanic basin record for Late Permian-Early Triassic strata in Lungmu Co-Sh⁃ uanghu-Lancang River area. The results obtained by the authors provide important evidence for furthe study of the evolution of Lungmu Co-Shuanghu-Lancang River suture zone.关键词
羌塘中部/龙木错-双湖-澜沧江缝合带/天泉山组/晚二叠世-早三叠世/LA-ICP-MS锆石U-Pb年龄Key words
Central Qiangtang/Lungmu Co-Shuanghu-Lancang River suture zone/Tianquanshan Formation/Late Permian-Early Triassic/LA-ICP-MS zircon U-Pb ages分类
天文与地球科学引用本文复制引用
刘金恒,胡培远,李才,解超明,范建军,于云鹏..藏北羌塘中部上二叠统-下三叠统天泉山组的建立及意义--对龙木错-双湖-澜沧江洋构造演化的指示[J].地质通报,2016,35(5):667-673,7.基金项目
国家自然科学基金项目（批准号41402190、41272240）、中国地质调查局项目（编号1212011221093、12120113036700）和中国地质科学院地质研究所基本科研业务费项目 （）
