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Sr-Nd-Hf Isotopic Disequilibrium During the Partial Melting of Metasediments: Insight From Himalayan Leucosome
Yang, Lei1,2,3; Wang, Jia-Min2; Liu, Xiao-Chi2; Khanal, Gautam P.3,4; Wu, Fu-Yuan2,3
2022-05-05
Source PublicationFRONTIERS IN EARTH SCIENCE
Volume10Pages:13
AbstractRadiogenic 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.
Keywordradiogenic isotopes partial melting isotope disequilibrium leucosome leucogranite
DOI10.3389/feart.2022.891960
WOS KeywordTRACE-ELEMENT ; U-PB ; INDIAN MARGIN ; ZIRCON AGES ; CONSTRAINTS ; MAGMATISM ; EVOLUTION ; METAMORPHISM ; LEUKOGRANITE ; CRYSTALLINE
Language英语
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000797863400001
PublisherFRONTIERS MEDIA SA
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/105970
Collection岩石圈演化国家重点实验室
Corresponding AuthorWang, Jia-Min
Affiliation1.Chengdu Univ Technol, Coll Earth Sci, Chengdu, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China
4.Dept Mines & Geol, Kathmandu, Nepal
First Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Recommended Citation
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.
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