SHRIMP U-Pb Dating and Its Stratigraphic Significance of Tuff Zircons from Heishan Formation of Kunyang Group, <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:City w:st="on">Dongchuan Area</st1:City>, <st1:State w:st="on">Yunnan</st1:State> Province, <st1:country-region w:st="on"><st1:place w:st="on">China</st1:place></st1:country-region> <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

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weight: bold" lang=EN-US>SHRIMP U-Pb Dating and Its Stratigraphic Significance of Tuff Zircons from Heishan Formation of Kunyang Group, Dongchuan Area, Yunnan Province, China

详细信息

责任者：Sun Zhiming (Chengdu Institute of Geology and Mineral Resources ; China Geological Survey ; Chengdu 610082 ; China) ; Yin Fuguang
刊名：Geological Bulletin of China
出版年：2009
卷期：28(7)
关键词：凝灰岩 ; tuff ; 铀—铅计时 ; U-Pb dating ; 中元古代 ; Mesoproterozoic ; 云南 ; Yunnan Province
页码：p.896-900
图表：3 illus., 1 table, 19 refs.
分类号：1300
issnNo：ISSN1671-2552
isbnNo：CN11-4648/P

摘要

There have been a lot of interests on the formation age of Kunyang Formation and its stratigraphy for a long time, some of the data obtained are referable while there is still a lack of high quality SHRIMP dating. During this time, Sample D0202 in representative of crystal chips and lithic fragments tuff with great stratigraphic significance was collected from middle to upper Heishan Group with a thickness about 180 m in Dongyang Area, Yunnan Province, from which over one hundred zircons were picked out to go through SHRIMP U-Pb dating, at the end, it’s indicated that the weighted average age is (1 503±17) Ma. Th/U value of Sample D0202 is over 0.48, and it displays a distinct oscillatory zoning structure, which can be regarded as typical magmatic cause, these all indicate that Heishan Formation is formed during Early Mesoproterozoic. This result can further prove that the formation age of Kunyang Group is over 1 500 Ma, thus can be provided as an evidence for ascertaining the age and stratigraphy of Kunyang Group.

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