Zircon U-Pb dating of basement gneisses in the super-large Bayan Obo REE-Fe-Nb deposit, Inner Mongolia  

作　　者：WANG Kaiyi FAN Hongrui XIE Yihan LI Huimin 

机构地区：[1]LTE,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China [2]Tianjin Institute of Geology and Mineral Resources,Chinese Academy of Geological Sciences,Tianjin 300170,China

出　　处：《Chinese Science Bulletin》2002年第3期243-247,共5页

基　　金：This work was supported by the NationalNatural Sciences Foundation of China; the Science and Technology of Commission of China.

摘　　要：Zircon U-Pb ages have been determined for basement gneisses in the Bayan Obo REE-Fe-Nb deposit. On the U-Pb concordia diagram data of three samples yield up-per intercept ages of 1948-1917 Ma. Thus, these basement gneisses are of Paleoproterozoic. Rock association of these basement gneisses includes tonalite, syenite and paragneiss, not belonging to a sedimentary package. It is more appro-priate to consider this association as a basement complex rather than a stratigraphic 'Group'.Zircon U-Pb ages have been determined for basement gneisses in the Bayan Obo REE-Fe-Nb deposit. On the U-Pb concordia diagram data of three samples yield upper intercept ages of 1948-1917 Ma. Thus, these basement gneisses are of Paleoproterozoic. Rock association of these basement gneisses Includes tonalite, syenite and paragneiss, not belonging to a sedimentary package. It is more appropriate to consider this association as a basement complex rather than a stratigraphic 'Group'.

关 键 词：BASEMENT complex ZIRCON U-PB age Bayan Obo. 

分 类 号：P588.3[天文地球—岩石学] P597[天文地球—地质学]