请用识别号来引用或链接此条目:
http://www.igeodata.org/handle/20.500.11758/344
点击复制成果名称: | SHRIMP zircon dating and LA-ICPMS Hf analysis of early Precambrian rocks from drill holes into the basement beneath the Central Hebei Basin, North China Craton |
作者: | Yusheng Wan Xianzheng Zhao Zejiu Wang Dunyi Liu Alfred Kröner Chunyan Dong Hangqian Xie Yuansheng Geng Yuhai Zhang Runlong Fan Huiyi Sun |
主题关键词: | Early Precambrian;North China;Craton Drill hole;Zircon dating |
首次发表日期: | 2014-02 |
出版者: | Institute of Geology Chinese Academy of Geological Sciences |
摘要: | The Central Hebei Basin (CHB) is one of the largest sedimentary basins in the North China Craton, extending in a northeastesouthwest direction with an area of >350 km 2 . We carried out SHRIMP zircon dating, Hf-in-zircon isotopic analysis and a whole-rock geochemical study on igneous and metasedi- mentary rocks recovered from drill holes that penetrated into the basement of the CHB. Two samples of gneissic granodiorite (XG1-1) and gneissic quartz diorite (J48-1) have magmatic ages of 2500 and 2496 Ma, respectively. Their zircons also record metamorphic ages of 2.41e2.51 and w2.5 Ga, respec- tively. Compared with the gneissic granodiorite, the gneissic quartz diorite has higher SREE contents and lower Eu/Eu* and (La/Yb) n values. Two metasedimentary samples (MG1, H5) mainly contain w2.5 Ga detrital zircons as well as late Paleoproterozoic metamorphic grains. The zircons of different origins have ε Hf (2.5 Ga) values and Hf crustal model ages ranging from 0 to 5 and 2.7 to 2.9 Ga, respectively. Therefore, w2.5 Ga magmatic and Paleoproterozoic metasedimentary rocks and late Neoarchean to early Paleoproterozoic and late Paleoproterozoic tectono-thermal events have been identified in the basement beneath the CHB. Based on regional comparisons, we conclude that the early Precambrian basement beneath the CHB is part of the North China Craton. |
引用地址: | http://www.igeodata.org/handle/20.500.11758/344 |
所属集合: | 科技成果 |
文件中的条目:
条目 | 描述 | 大小 | 格式 | |
---|---|---|---|---|
Early Neoarchean (∼2.7 Ga) tectono-thermal events in the NorthChina Craton.pdf | 4.5 MB | Adobe PDF |
![]() 下载/打开 |
在科技平台中所有的数据项都受到原著作权保护。
由于有些作者找不到原文手稿,所以从有关数据库上下载其作品以替之,如有疑义,请联系管理员。