Zircon SHRIMP U-Pb dating of meta-diorite from the basement of the Songliao Basin and its geological significance  

作　　者：WANG Ying ZHANG Fuqin ZHANG Dawei MIAO Laicheng LI Tiesheng XIE Hangqiang MENG Qingren LIU Dunyi 

机构地区：[1]Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China [2]Exploration Management Department of Jilin Oilfield, Songyuan 138000, China [3]Exploration and Development Research Institute of Jilin Oilfield, Songyuan 138000, China [4]Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

出　　处：《Chinese Science Bulletin》2006年第15期1877-1883,共7页

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.40473030 and 40234045);Chinese Academy of Sciences(Grant No:KZCX2-104).

摘　　要：The basement of the Songliao Basin mainly contains low-grade metamorphic rocks and granites. It has been long disputed whether the basin has Precambrian metamorphic basement. This is a report of zircon SHRIMP U-Pb dating results of a meta-diorite sample, which was taken from the Si-5 drilling hole in the southern portion of the Songliao Basin. The SHRIMP analyses indicate that the meta-diorite with a weighted mean 207Pb/206Pb age of 1839±7 Ma (2σ, n = 8) was emplaced during Paleo-Proterozoic time. Additionally, the meta-diorite has old Nd model ages (TDM1: 2999Ma; TDM2: 2849Ma). These data suggest that the south- ern part of the Songliao Basin do possess Precambrian base- ment.The basement of the Songliao Basin mainly contains low-grade metamorphic rocks and granites. It has been long disputed whether the basin has Precambrian metamorphic basement. This is a report of zircon SHRIMP U-Pb dating results of a meta-diorite sample, which was taken from the Si-5 drilling hole in the southern portion of the Songliao Basin. The SHRIMP analyses indicate that the meta-diorite with a weighted mean ^207pb/^206pb age of 1839±7 Ma （2σ, n = 8） was emplaced during Paleo-Proterozoic time. Additionally, the meta-diorite has old Nd model ages （TDMI： 2999Ma; TOM2： 2849Ma）. These data suggest that the southern part of the Songliao Basin do possess Precambrian basement.

关 键 词：锆石 SHRIMP定年 闪长岩 前寒武纪基岩 松辽盆地 

分 类 号：P597.3[天文地球—地球化学]