Zircon U-Pb geochronology and Hf isotopes of granitic rocks and river sands in the Nyingchi region, Tibet: Constraints on evolution of the deep crust beneath the southeast Lhasa terrane
文献类型：期刊论文
| 作者 | Ji, Wei-Qiang1,2; Wu, Fu-Yuan1,2; Liu, Chuan-Zhou1,2; Zhang, Hao1,3 |
| 刊名 | JOURNAL OF ASIAN EARTH SCIENCES
 |
| 出版日期 | 2017-09-01 |
| 卷号 | 145页码:613-625 |
| 关键词 | Nyingchi region Tibet U-Pb age Hf isotope Late Oligocene Delamination |
| ISSN号 | 1367-9120 |
| DOI | 10.1016/j.jseaes.2017.07.006 |
| 文献子类 | Article |
| 英文摘要 | The Nyingchi region is the best location to investigate the nature and evolution of the deep crust beneath the Lhasa terrane, as the middle and lower crust rocks are well exposed due to the long-term uplift and erosion of the Namche Barwa syntaxis. A systematic study of whole rock geochemistry and zircon U-Pb age and Hf isotope was conducted on granitic rocks exposed in the area. These data, combined with U-Pb ages and Hf isotopes of detrital zircons from river sands, were utilized to reveal the nature of the deep crust. The granitic intrusions in the area can be divided into two main stages, i.e., the latest Cretaceous to Eocene (67-44 Ma) and the Late Oligocene (28-23 Ma). The earlier stage of granitic rocks has SiO2 contents of 67.65-75.22 wt% and exhibits highly variable zircon elif(t) values ranging from - 15.5 +/- 1.3 to 9.2 +/- 0.8, suggesting that they were derived from a remarkably heterogeneous source. The late stage of granitic rocks, with Si02 of 64.37-75.86 wt%, has zircon eHf(t) values ranging from 1.6 +/- 1.3 to 3.9 +/- 0.8, indicating that they were derived from a relatively homogenous and slightly depleted source. In combination with literature data, it is proposed that the Late Oligocene magmatism may prevail in the Lhasa terrane and this extensive magmatic pulse can be attributed to coeval delamination of the subducted Indian continent. |
| WOS关键词 | EASTERN HIMALAYAN SYNTAXIS ; EARLY CARBONIFEROUS GRANITOIDS ; GRANULITE-FACIES METAMORPHISM ; NAMCHE-BARWA SYNTAXIS ; TECTONIC EVOLUTION ; ULTRAPOTASSIC MAGMATISM ; ADAKITIC INTRUSIVES ; GANGDESE BATHOLITH ; WEST EXTENSION ; LASER-ABLATION |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000411533600021 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 资助机构 | National Key R & D Program of China(2016YFC0600407) ; National Key R & D Program of China(2016YFC0600407) ; National Natural Science Foundation of China(41572055 ; National Natural Science Foundation of China(41572055 ; 41130313) ; 41130313) ; National Key R & D Program of China(2016YFC0600407) ; National Key R & D Program of China(2016YFC0600407) ; National Natural Science Foundation of China(41572055 ; National Natural Science Foundation of China(41572055 ; 41130313) ; 41130313) ; National Key R & D Program of China(2016YFC0600407) ; National Key R & D Program of China(2016YFC0600407) ; National Natural Science Foundation of China(41572055 ; National Natural Science Foundation of China(41572055 ; 41130313) ; 41130313) ; National Key R & D Program of China(2016YFC0600407) ; National Key R & D Program of China(2016YFC0600407) ; National Natural Science Foundation of China(41572055 ; National Natural Science Foundation of China(41572055 ; 41130313) ; 41130313) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/61977]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 通讯作者 | Ji, Wei-Qiang |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, POB 9825, Beijing 100029, Peoples R China 2.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ji, Wei-Qiang,Wu, Fu-Yuan,Liu, Chuan-Zhou,et al. Zircon U-Pb geochronology and Hf isotopes of granitic rocks and river sands in the Nyingchi region, Tibet: Constraints on evolution of the deep crust beneath the southeast Lhasa terrane[J]. JOURNAL OF ASIAN EARTH SCIENCES,2017,145:613-625. |
| APA | Ji, Wei-Qiang,Wu, Fu-Yuan,Liu, Chuan-Zhou,&Zhang, Hao.(2017).Zircon U-Pb geochronology and Hf isotopes of granitic rocks and river sands in the Nyingchi region, Tibet: Constraints on evolution of the deep crust beneath the southeast Lhasa terrane.JOURNAL OF ASIAN EARTH SCIENCES,145,613-625. |
| MLA | Ji, Wei-Qiang,et al."Zircon U-Pb geochronology and Hf isotopes of granitic rocks and river sands in the Nyingchi region, Tibet: Constraints on evolution of the deep crust beneath the southeast Lhasa terrane".JOURNAL OF ASIAN EARTH SCIENCES 145(2017):613-625. |
入库方式： OAI收割
来源：地质与地球物理研究所
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