Multistage magmatism recorded in a single gneiss dome: Insights from the Lhagoi Kangri leucogranites, Himalayan orogen
文献类型：期刊论文
| 作者 | He, Shao-Xiong1,2; Liu, Xiao-Chi1 ; Yang, Lei3; Wang, Jia-Min1; Hu, Fang-Yang1; Wu, Fu-Yuan1,2
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| 刊名 | LITHOS
 |
| 出版日期 | 2021-10-01 |
| 卷号 | 398页码:21 |
| 关键词 | Crustal anatexis Leucogranite U-Th-Pb geochronology Himalayan orogen North Himalayan gneiss dome |
| ISSN号 | 0024-4937 |
| DOI | 10.1016/j.lithos.2021.106222 |
| 英文摘要 | Determining the geochronological framework and geochemical nature of magmatism associated with orogenic processes is crucial to decipher the evolution of orogenic belts. The Himalayan orogen has recorded considerable information regarding deformation, metamorphism, and magmatism related to orogenic processes. Here, we identify four stages of granitic magmatism on the basis of monazite U-Th-Pb dating of rocks from the Lhagoi Kangri dome, north Himalayan antiform, southern Tibet: middle Eocene (42-40 Ma), late Eocene (ca. 36 Ma), Oligocene (ca. 26Ma), and Miocene (16-13 Ma). The middle Eocene tourmaline-bearing leucogranite is characterized by (1) relatively high SiO2 (78.7 wt%), Al2O3 (12.6 wt%), and Na2O (6.3 wt%) contents; (2) enrichment in light rare earth elements (LREEs), depletion in heavy REEs, high abundances of REEs, and pronounced negative Eu anomalies; and (3) relatively low values of whole-rock Sr\\Nd isotope compositions (Sr-87/Sr-86(t) = 0.72101 and epsilon Nd(t) = -9.8). And the coeval garnet-bearing two-mica granite has a pronounced negative Eu anomaly (Eu/Eu* = 0.07) and a significate lanthanide tetrad effect (TE1,3 = 1.46). These geochemical data suggest that these leucogranites underwent fractional crystallization. They provide a robust evidence for that anatexis of the lower crust of Indian plate began at 42-40 Ma in the central Himalayan orogen. The Oligocene and Miocene two-mica granites share broadly similar geochemical characteristics, such as moderate REE contents and weak negative Eu anomalies, and are distinct from the garnet-bearing muscovite leucogranite. Whole-rock Sr\\Nd isotope compositions of the Oligocene and Miocene leucogranites differ from those of the middle Eocene leucogranites, with higher Sr-87/Sr-86(t) ratios (0.73524-0.74188) and lower epsilon Nd(t) values (-14.7 to -13.7). These geochemical data indicate that the Oligocene and Miocene leucogranites are products of muscovite-dehydration melting of metasedimentary rocks. The garnet-bearing muscovite leucogranite shows the REE tetrad effect, which suggests that it is more evolved than the coeval two-mica granite. We therefore infer that the variations in age and isotopic characteristics of the studied leucogranites were caused by a change in melt source resulting from the compression-extension evolution of the Himalayan collisional orogenic system. (C) 2021 Elsevier B.V. All rights reserved. |
| WOS关键词 | METAMORPHIC CORE COMPLEX ; NORTH-SOUTH EXTENSION ; TECTONIC EVOLUTION ; TETHYAN HIMALAYA ; U-PB ; CRUSTAL ANATEXIS ; PERALUMINOUS GRANITES ; STRUCTURAL GEOMETRY ; EXHUMATION HISTORY ; FLUID-ABSENT |
| 资助项目 | National Natural Science Foundation of China[41888101] ; National Natural Science Foundation of China[41772058] ; National Natural Science Foundation of China[41972065] ; second comprehensive scientific investigation into Qinghai-Tibet Plateau[2019QZKK0802] |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000687294400002 |
| 出版者 | ELSEVIER |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; second comprehensive scientific investigation into Qinghai-Tibet Plateau ; second comprehensive scientific investigation into Qinghai-Tibet Plateau ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; second comprehensive scientific investigation into Qinghai-Tibet Plateau ; second comprehensive scientific investigation into Qinghai-Tibet Plateau ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; second comprehensive scientific investigation into Qinghai-Tibet Plateau ; second comprehensive scientific investigation into Qinghai-Tibet Plateau ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; second comprehensive scientific investigation into Qinghai-Tibet Plateau ; second comprehensive scientific investigation into Qinghai-Tibet Plateau |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/102611]  |
| 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 | Liu, Xiao-Chi |
| 作者单位 | 1.Chinese Acad Sci, Inst Earth Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 3.Chengdu Univ Technol, Dept Earth Sci, Chengdu 610059, Sichuan, Peoples R China |
| 推荐引用方式 GB/T 7714 | He, Shao-Xiong,Liu, Xiao-Chi,Yang, Lei,et al. Multistage magmatism recorded in a single gneiss dome: Insights from the Lhagoi Kangri leucogranites, Himalayan orogen[J]. LITHOS,2021,398:21. |
| APA | He, Shao-Xiong,Liu, Xiao-Chi,Yang, Lei,Wang, Jia-Min,Hu, Fang-Yang,&Wu, Fu-Yuan.(2021).Multistage magmatism recorded in a single gneiss dome: Insights from the Lhagoi Kangri leucogranites, Himalayan orogen.LITHOS,398,21. |
| MLA | He, Shao-Xiong,et al."Multistage magmatism recorded in a single gneiss dome: Insights from the Lhagoi Kangri leucogranites, Himalayan orogen".LITHOS 398(2021):21. |
入库方式： OAI收割
来源：地质与地球物理研究所
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