SHRIMP Zircon U-Pb Dating of the Tongshi Magmatic Complex in Western Shandong and Its Geological Implications

查看全文 作　　者：HU [1,2]Huabin;MAO [2]Jingwen;LIU [3]Dunyi;NIU [1]Shuyin;WANG [3]Yanbin;LI [2]Yongfeng;SHI [3]Ruruo

机构地区：[1]Shijiazhuang University of Economics, Shijiazhuang, Hebei 050031;[2]China University of Geosciences, Beijing 100083;[3]Institute of Geology, Chinese Academy of Geological Science, Beijing 100037

出　　处：《Acta Geologica Sinica(English Edition)》索引2005年第79卷第4期,共6页

基　　金：This study was supported by the Major State Basic Rsearch Program of China(grant G1999043211);National Natural Science Foundation of China(grant 40272088). 摘　　要：The SHRIMP U-Pb zircon dating result of the Tongshi magmatic complex in western Shandong is presented in this paper. The Tongshi magmatic complex comprises fine-grained porphyritic diorite and syenitic porphyry. Eighteen analyses for fine-grained porphyritic diorite gave two concordia ages, in which ten analyses constitute the young age group, giving 206Pb/238U ages ranging from 167.9 Ma to 183 Ma with a weighted mean age of 175.7 ± 3.8 Ma, and the other eight yielded 207Pb/206Pb ages of 2502 Ma to 2554 Ma with a weighted mean 2518 ± 11 Ma. Two analyses for syenitic porphyry gave ages of 2485 Ma and 2512 Ma, respectively. The age of 175.7± 3.8 Ma indicates that the crystallization of the Tongshi magmatic complex occurred in the Middle Jurassic, whereas that of 2518 ± 11 Ma is interpreted as the age of inherited magmatic zircons in the Neoarchean Wutai period. 关键词：锆石山东地质年代学岩石岩浆岩

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SHRIMP Zircon U-Pb Dating of the Tongshi Magmatic Complex in Western Shandong and Its Geological Implications

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