DOI: 10.1016/j.scib.2021.07.020
论文题名: Barium isotope evidence for the role of magmatic fluids in the origin of Himalayan leucogranites
作者: Huang F. ; Bai R. ; Deng G. ; Liu X. ; Li X.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2021
语种: 英语
中文关键词: 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
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 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170275
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Huang F.,Bai R.,Deng G.,et al. Barium isotope evidence for the role of magmatic fluids in the origin of Himalayan leucogranites[J]. Science Bulletin,2021-01-01