Age and Tectonic Implications of the Late Triassic Nadi Kangri Volcanic Rocks in the space prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:PlaceName w:st="on">Qiangtangst1:PlaceName> <st1:PlaceType w:st="on">Basinst1:PlaceType>, Northern Tibet, <st1:country-region w:st="on"><st1:place w:st="on">Chinast1:place>st1:country-region>space prefix = o ns = "urn:schemas-microsoft-com:office:office" />

详细信息   

• 责任者：Fu Xiugen (Chengdu Institute of Geology and Mineral Resources ; Chengdu 610081 ; China) ; Wang Jian
• 刊名：Journal of Chengdu University of Technology
• 出版年：2010
• 卷期：37(6)
• 关键词：晚三叠世 ; Upper Triassic ; 沉积间断 ; hiatus ; 羌塘盆地 ; Qiangtang Basin
• 页码：p.605-615
• 图表：5 illus., 3 tables, 46 refs.
• 分类号：1200
• issnNo：ISSN1671-9727
• isbnNo：CN51-1634/N

摘要

<SPAN id=EnChDivSummary name="EnDivSummary">Combined with the basal conglomerate observed on the bottom of the Nadi Kangri Formation, this paper confirms that a sedimentary hiatus probably exists between the Nadi Kangri and underlying strata. Therefore, the Nadi Kangri strata represent a new history of the Mesozoic Qiangtang Basin, and the age of the Nadi Kangri volcanic rocks represents the onset of the Mesozoic Qiangtang Basin. Additionally, the results show that the ⁴⁰Ar/³⁹Ar plateau age of the diabase from the Gangma Co area （the west part of the north Qiangtang Basin） is (197±4) Ma. Previously the authors also obtained SHRIMP zircon U-Pb ages of the Nadi Kangri volcanic rocks from the east, the west, and the middle parts of the Qiangtang Basin. They are （220.4±2.3), 208~225, 205~220 Ma, respectively. This indicates that the eruption age of the Nadi Kangri volcanic rocks in the Qiangtang Basin is about 205~220 Ma. These data show that the onset of the Mesozoic Qiangtang Basin should be the Late Triassic time （about 205~220 Ma B.P.）.