http://www.sciencedirect.com/science/article/pii/S1674987114000322 |
| |
| Authors: | Yusheng Wan ;Xianzheng Zhao ;Zejiu Wang ;Dunyi Liu ;Alfred KrOner ;Chunyan Dong ;Hangqian ;Yuansheng Geng ;Yuhai Zhang ;Runlong Fan ;HuiyiSun |
| |
| Institution: | [1]Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China; [2]Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China; [3]State Key Laboratory for Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 10007,7, China; [4]North China Oil field Company o.f PetroChina, Renqiu 062552, China; [5]Chinese Academy of Geological Sciences, Beijing 100037, China |
| |
| Abstract: | The Central Hebei Basin (CHB) is one of the largest sedimentary basins in the North China Craton, extending in a northeast–southwest direction with an area of >350 km2. We carried out SHRIMP zircon dating, Hf-in-zircon isotopic analysis and a whole-rock geochemical study on igneous and metasedimentary 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 2.41–2.51 and ～2.5 Ga, respectively. Compared with the gneissic granodiorite, the gneissic quartz diorite has higher ΣREE contents and lower Eu/Eu* and (La/Yb)n values. Two metasedimentary samples (MG1, H5) mainly contain ～2.5 Ga detrital zircons as well as late Paleoproterozoic metamorphic grains. The zircons of different origins have εHf (2.5 Ga) values and Hf crustal model ages ranging from 0 to 5 and 2.7 to 2.9 Ga, respectively. Therefore, ～2.5 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. |
| |
| Keywords: | Early PrecambrianNorth China CratonDrill holeZircon datingHf isotopic analysis |
| 本文献已被 维普 ScienceDirect 等数据库收录！ |
| 点击此处可从《地学前缘(英文版)》浏览原始摘要信息 |
| 点击此处可从《地学前缘(英文版)》下载免费的PDF全文 |
|
