西昆仑库地蛇绿岩中基性火山岩的Sm-Nd等时线年龄

详细信息

收稿日期: 2009-10-14

修回日期: 2009-11-16

录用日期: 2010-01-25

刊出日期: 2010-01-25

SmNd isotopic ages of basic rocks in Kudi ophiolite of west Kunlun

- Institute of Geology and Geophysics|Chinese Academy of Sciences|Beijing 100029

Received Date: 14 October 2009

Revised Date: 16 November 2009

Accepted Date: 25 January 2010

Publish Date: 25 January 2010

摘要: 本文总结了前人有关库地蛇绿岩系各组成单元以及与其有成因联系的岩浆岩的年代学资料，同时利用SmNd法测定了一些克沟基性火山岩的形成时代，获得了2个晚元古代全岩等时线年龄： 1〖CS％0，0，0，0〗〖CS〗023±51 Ma和834±29 Ma。在此基础上，对库地蛇绿岩系的形成和演化时代进行了讨论，认为库地蛇绿岩中基性火山岩的SmNd等时线年龄可能代表了库地洋开始消减俯冲的年代。
- 西昆仑库地蛇绿岩 SmNd等时线年龄形成时间
Abstract: The Kudi ophiolite is the north most suture zone in the Tibetan Plateau，and it was considered to be the remnant of the PaleoTethys. Isotopic and radiolarian ages on different components of Kudi ophiolite and its associated rocks by former researchers are summarized and analyzed. By using Sm/Nd isotopic chronological dating，two Late Protozoic ages of the basic rocks of Kudi ophiolite， 1023±51 and 834±29 Ma，respectively，were obtained. On the basis of further discussion on the formation of Kudi ophiolite，we considered that these ages might represent the time period of the subduction of Kudi ocean. 
- West Kunlun，Kudi ophiolite，SmNd isotopic age，Formation ages〖=〗

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