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武当群上部变沉积岩组时代归属问题:单锆石U-Pb年龄的制约 预览 被引量:22

A DISCUSSION ON THE AGE OF THE META-SEDIMENTARY ROCKS IN THE UPPER PART OF THE WUDANG GROUP: CONSTRAINED BY THE GRAIN-ZIRCON U-Pb DATING
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摘要 武当群主要分布在南秦岭武当地块中部,下部为变火山岩组,上部为变沉积岩组。目前认为上部变沉积岩组成岩年龄为10001200Ma,属中元古代。从上部变沉积岩组凝灰岩夹层中获得5颗锆石进行了U—Pb法年龄测定,结果显示时代为(744±36)Ma,结合古生物及地层研究成果,认为测定的这组年龄值代表了武当岩群上部变沉积岩组的成岩时间为南华纪。 The Wudang Group is mainly distributed in the center of the Wudang Block of southern Qinling Mountian. This group is composed of meta-sedimentary rocks (above) and meta-volcanic rocks (below). The forming age of the meta-sedimentary rocks was presently considered to be between 1000 and 1200 Ma. Five zircon grains were collected from the tuff sandwich in the meta-sedimentary rocks. U-Pb dating of these grain zircons shows that the age of the tuff sandwich is (744±36)Ma, different from the age we pre- vious suggested. The authors argue that the zircon U-Pb dating result is credible and the (744±36)Ma should represent the forming age of the meta-sedimentary rocks in the upper part of the Wudang Group. Hence, the grain-zircon U-Pb dating constrains the meta-sediment rocks to be in the Nanhuan, Cryogenian Period.
作者 蔡志勇 罗洪 熊小林 吴德宽 吴贤亮 孙三才 杨军 CAI Zhi-yong, LUO Hong, XIONG Xiao-lin, WU De-kuan WU Xian-liang, SUN San-cai, Yang Jun ( 1 ) Northwestern Hubei Survey of Geology and Mineral Resources, Xiangfan, 441003; 2) Guangzhou Institute of Geochemistry, the Chinese Academy of Sciences, Guangzhou, 510640 )
出处 《地层学杂志》 CSCD 北大核心 2006年第1期 60-63,共4页 Journal of Stratigraphy
基金 鄂西北地质矿产调查所1/5万《大木厂幅》、《老营仓幅》联测区域地质调查成果。
关键词 武当群 变沉积岩组 单锆石U—Pb年龄 南华纪 湖北 Wudang group, meta-sedimentary rocks, zircon U-Pb dating, Nanhuan, Cryogenian Period,Hubei provience
作者简介 蔡志勇,1965年2月生,男,湖北罗田人,在职博士生,高级工程师,主要从事矿床地质学及岩石学研究。E—mail:zhiyongcai@vip.sina.com。
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