globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116109
论文题名:
Nitrogen and noble gas isotopic compositions of mantle xenoliths from Far Eastern Russia: Implications for nitrogen isotopic characteristics of mantle wedge fluid
作者: Yamamoto J.; Takahata N.; Sano Y.; Yanagita M.; Arai S.; Prikhod'ko V.S.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 534
语种: 英语
中文关键词: fluid inclusion ; mantle wedge ; mantle xenolith ; nitrogen isotope ; noble gases
英文关键词: Isotopes ; Nitrogen ; Fluid inclusion ; Isotopic composition ; Kinetic fractionations ; Mantle wedge ; Mantle xenoliths ; Nitrogen isotopes ; Noble gas isotopic composition ; Tectonic settings ; Inert gases ; Cenozoic ; fluid inclusion ; igneous geochemistry ; isotopic composition ; mantle ; Mesozoic ; nitrogen isotope ; noble gas ; plate convergence ; subduction ; tectonic setting ; xenolith ; Russian Federation
英文摘要: To investigate nitrogen circulation via subduction, we measured isotopic compositions of nitrogen and noble gases of mantle-derived xenoliths from Far Eastern Russia, where the tectonic setting is a plate convergence margin in the Mesozoic to Cenozoic era. Kinetic fractionation accompanies the extraction of volatiles from a subducting plate, engendering the infiltration of fluids with light isotopic compositions into mantle wedge. The δ15N values are −13.26 to +0.19‰, some of which are lower than those of air (0‰) and upper mantle (−5 ± 2‰). The 3He/4He and 40Ar/36Ar ratios are 0.2–5.6 Ra and 304–1156, respectively, which are common for the mantle xenoliths in eastern Asia, a representative subduction setting. The N2/36Ar are 1.5 × 104 – 4.5 × 104, which are much lower than the mantle value (6.7 × 106) and which are rather more similar to atmospheric (2.5 × 104) and deep seawater (1.1 × 104) values. Kinetic fractionation can lower the δ15N value to −15‰ without marked change of the N2/36Ar ratio. Therefore, the low δ15N values of the present xenoliths might be regarded as values of the fluid experiencing fractionation during infiltration of the fluid from the subducting oceanic plate into the mantle wedge. © 2020 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165356
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作者单位: The Hokkaido University Museum, Nishi 8, Kita 10, Kita-ku, Sapporo, 060-0810, Japan; Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, 277-8564, Japan; Institute of Surface-Earth System Science, Tianjin University, Nankai District, Tianjin, 300072, China; Graduate School of Science, Hokkaido University, Kita 10 Nishi 8, Kita-ku, Sapporo, 060-0810, Japan; Department of Earth Sciences, Faculty of Science, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan; Institute of Tectonics and Geophysics (Far Eastern Branch, Russian Academy of Sciences), 65 Kim Yu Chen Str., Khabarovsk, 680063, Russian Federation

Recommended Citation:
Yamamoto J.,Takahata N.,Sano Y.,et al. Nitrogen and noble gas isotopic compositions of mantle xenoliths from Far Eastern Russia: Implications for nitrogen isotopic characteristics of mantle wedge fluid[J]. Earth and Planetary Science Letters,2020-01-01,534
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