Determination of U-Pb age and rare earth element concentrations of zircons from Cenozoic intrusions in northeastern China by laser ablation ICP-MS  

作　　者：YUAN Honglin WU Fuyuan GAO Shan LIU Xiaoming XU Ping SUN Deyou 

机构地区：[1]Department of Geology, Northwest University, Xi' an 710069, China [2]Institute of Geology and Geophysics, Chinese Academy of Sciences,Bejing 100029, China [3]Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China [4]College of Barth Sciences, Jilin University, hangchun 130061, China

出　　处：《Chinese Science Bulletin》2003年第22期2411-2421,共11页

基　　金：co-supported by the National Natural Science Foundation of China(Grant Nos.40133020 and 40272045);the Chinese Ministry of Science and Technology of China(Grant No.G1999043202);the Chinese Academy of Sciences and the Key Laboratory of Continental Dynamics,Northwest University,the Ministry of Education of China.

摘　　要：Using the in situ zircon U-Pb dating method of LA-ICPMS, we analyzed the 31 Ma old SHRIMP U-Pb age of the Yongsheng nepheline syenite from southern Jilin Province under different spot sizes. The obtained ages are comparable with that of SHRIMP in both accuracy and precision. The age is also identical to that of the Yinmawanshan gabbro from the Liaodong Peninsula within error. Both the Yongsheng nepheline syenite and the Yinmawanshan gabbro represent the youngest known exposed intrusions in northeastern and even eastern China. The results indicate the Eocene mantle-derived magmatic underplating, and the rapid crustal uplifting of this region since 30 Ma. The analyses also document extremely high LREE concentrations and relatively flat REE patterns for the zircons from the Yongsheng nepheline syenite, which represent a new type of zircon REE pattern.Using the in situ zircon U-Pb dating method of LA-ICPMS, we analyzed the 31 Ma old SHRIMP U-Pb age of the Yongsheng nepheline syenite from southern Jilin Province under different spot sizes. The obtained ages are comparable with that of SHRIMP in both accuracy and precision. The age is also identical to that of the Yinmawanshan gabbro from the Liaodong Peninsula within error. Both the Yongsheng nepheline syenite and the Yinmawanshan gabbro represent the youngest known exposed intrusions in northeastern and even eastern China. The results indicate the Eocene mantle-derived magmatic underplating, and the rapid crustal uplifting of this region since 30 Ma. The analyses also document extremely high LREE concentrations and relatively flat REE patterns for the zircons from the Yongsheng nepheline syenite, which represent a new type of zircon REE pattern.

关 键 词：Pb 铅 锆石 中国 东北地区 地球年代学 

分 类 号：P597.3[天文地球—地球化学]