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DOI	10.1016/j.scib.2021.07.020
	Barium isotope evidence for the role of magmatic fluids in the origin of Himalayan leucogranites
	Huang F.; Bai R.; Deng G.; Liu X.; Li X.
发表日期	2021
ISSN	20959273
英文摘要	As an important post-collisional magmatic product in the orogenic belt, the Himalayan leucogranites are the critical host rocks for a number of rare-metal mineralization (such as Li, Be, Cs, Rb, Nb, Ta, and Sn). However, there is still a lack of good understanding on the formation and evolution of the leucogranites. Particularly, the role of the magmatic fluids in transporting and enriching the rare elements is not clear. Here we measure Ba isotope compositions for leucogranites from the Kampa Dome of the Himalayan belt to understand the fluid activity and behavior of fluid-mobile elements during leucogranite formation. Our results show that the δ138/134Ba of leucogranites range from −1.32‰ to +0.12‰, much lower than the literature values for S-type granites and various sedimentary materials, suggesting that the Ba isotope compositions of the leucogranites does not reflect the sedimentary source signatures. Instead, their low δ138/134Ba is accompanied by non-charge-and-radius-controlled (CHARAC) twin-element (such as Nb/Ta) behaviors, clearly showing the involvement of magmatic fluids during magma evolution. Experimental studies suggest that the low δ138/134Ba of the magmatic fluids most likely results from exsolution from a large deep magma reservoir. Such fluids not only modified Ba isotope compositions of the leucogranites, but also transported many fluid-mobile metal elements which may help form the rare metal ore deposits. Therefore, Ba isotope data provide new insights into formation and evolution of magmatic fluids and exploration of the rare-metal mineralization. © 2021 Science China Press
关键词	Barium isotopes Fluid interaction Himalaya Leucogranite Rare-metal mineralization
英文关键词	Barite; Barium; Deposits; Isotopes; Sedimentology; Barium isotope; Fluid interactions; Formation and evolutions; Himalayas; Isotope compositions; Leucogranites; Magmatic fluids; Mineralisation; Rare metals; Rare-metal mineralization; Mineralogy
语种	英语
来源期刊	Science Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207431
作者单位	CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China; CAS Center for Excellence in Comparative Planetology, University of Science and Technology of China, Hefei, 230026, China; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China
推荐引用方式 GB/T 7714	Huang F.,Bai R.,Deng G.,et al. Barium isotope evidence for the role of magmatic fluids in the origin of Himalayan leucogranites[J],2021.
APA	Huang F.,Bai R.,Deng G.,Liu X.,&Li X..(2021).Barium isotope evidence for the role of magmatic fluids in the origin of Himalayan leucogranites.Science Bulletin.
MLA	Huang F.,et al."Barium isotope evidence for the role of magmatic fluids in the origin of Himalayan leucogranites".Science Bulletin (2021).