Sr-Nd-Hf Isotopic Disequilibrium During the Partial Melting of Metasediments: Insight From Himalayan Leucosome
文献类型：期刊论文
| 作者 | Yang, Lei1,2,3; Wang, Jia-Min1; Liu, Xiao-Chi1 ; Khanal, Gautam P.3,4; Wu, Fu-Yuan1,3
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| 刊名 | FRONTIERS IN EARTH SCIENCE
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| 出版日期 | 2022-05-05 |
| 卷号 | 10页码:13 |
| 关键词 | radiogenic isotopes partial melting isotope disequilibrium leucosome leucogranite |
| DOI | 10.3389/feart.2022.891960 |
| 英文摘要 | Radiogenic isotopes of granitoids are widely applied to fingerprint the source of granitoids and study the magma mingling and assimilation processes, aiming to decipher the planetary differentiation. This weapon is based on the assumption that crustal melts inherit the radiogenic isotopes of protoliths. However, complicated melting processes in the crust would drive the radiogenic isotopes of melt away from the source, thus calling for a clear understanding of the behaviors of radiogenic isotopes during crustal melting. This study investigated the joint behavior of Rb-Sr, Sm-Nd, and Lu-Hf isotope systems during the melting of metasediments. Leucosome, schist, and leucogranite samples were collected from the Nyalam, South Tibet, where the leucosome was produced by muscovite dehydration melting of metapelites. Results show that the leucosome has a broad range of Sr-Nd-Hf isotopes (Sr-87/Sr-86(i): 0.763,48-0.875321, epsilon Nd-(t): 14.6-11.6, epsilon Hf-(t): 15.0-4.4) that deviate from the metasediments. We attributed it to the non-modal or disequilibrium melting of metapelites. The variation of Sr isotopes of leucosome is formed due to preferential entry into the melt of muscovite relative to plagioclase during melting. The changing Sr-87/(86)Sri and Rb-87/Sr-86 of leucosome define an errorchron at similar to 500 Ma indicating an early Paleozoic tectono-thermal event supported by the U-Pb age of zircon cores (similar to 460 Ma) in the leucosome. The Nd isotopes of leucosome are mainly controlled by the preferential dissolution of apatite relative to monazite. The inadequate dissolution of zircon caused more depleted initial Hf isotopes compositions in the leucosome than the source. However, the leucosome with a higher crystallization temperature has radiogenic isotopic composition closer to the source. It indicates that the melting temperature greatly affects the isotope equilibrium between source and melt. |
| WOS关键词 | TRACE-ELEMENT ; U-PB ; INDIAN MARGIN ; ZIRCON AGES ; CONSTRAINTS ; MAGMATISM ; EVOLUTION ; METAMORPHISM ; LEUKOGRANITE ; CRYSTALLINE |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000797863400001 |
| 出版者 | FRONTIERS MEDIA SA |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/105970]  |
| 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 | Wang, Jia-Min |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China 2.Chengdu Univ Technol, Coll Earth Sci, Chengdu, Peoples R China 3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China 4.Dept Mines & Geol, Kathmandu, Nepal |
| 推荐引用方式 GB/T 7714 | Yang, Lei,Wang, Jia-Min,Liu, Xiao-Chi,et al. Sr-Nd-Hf Isotopic Disequilibrium During the Partial Melting of Metasediments: Insight From Himalayan Leucosome[J]. FRONTIERS IN EARTH SCIENCE,2022,10:13. |
| APA | Yang, Lei,Wang, Jia-Min,Liu, Xiao-Chi,Khanal, Gautam P.,&Wu, Fu-Yuan.(2022).Sr-Nd-Hf Isotopic Disequilibrium During the Partial Melting of Metasediments: Insight From Himalayan Leucosome.FRONTIERS IN EARTH SCIENCE,10,13. |
| MLA | Yang, Lei,et al."Sr-Nd-Hf Isotopic Disequilibrium During the Partial Melting of Metasediments: Insight From Himalayan Leucosome".FRONTIERS IN EARTH SCIENCE 10(2022):13. |
入库方式： OAI收割
来源：地质与地球物理研究所
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