DOI: 10.1016/j.epsl.2018.06.020
Scopus记录号: 2-s2.0-85048752488
论文题名: Noble gas and carbon isotopic compositions of petit-spot lavas from southeast of Marcus Island
作者: Yamamoto J. ; Kawano T. ; Takahata N. ; Sano Y.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 497 起始页码: 139
结束页码: 148
语种: 英语
英文关键词: carbon isotopic ratio
; crustal assimilation
; lithosphere–asthenosphere boundary
; Marcus Island
; noble gases
; petit-spot
Scopus关键词: Atmospheric chemistry
; Carbon
; Hydrogen bonds
; Isotopes
; Radiogenic gases
; Atmospheric components
; Carbon isotopic composition
; crustal assimilation
; Isotopic ratios
; Marcus Island
; Noble gas isotopic composition
; Oceanic lithosphere
; petit-spot
; Inert gases
; asthenosphere
; carbon isotope
; crustal structure
; isotopic composition
; lava
; lithosphere
; noble gas
; seamount
; Bonin Islands
; Honshu
; Japan
; Kanto
; Marcus Island
; Tokyo [Kanto]
英文摘要: We measured noble gas isotopic compositions of quenched lavas sampled from seamounts, so-called petit-spot volcanoes, on the 160-million-year-old northwestern Pacific Plate. The samples 3He/4He and 40Ar/36Ar ratios were, respectively, 2.5–8.3 Ra and up to 1735, where Ra stands for atmospheric 3He/4He, which are analogous to or lower than those of MORB. Considering narrow sampling regions, a secondary effect might be responsible for variation of the data. During ascent and subsequent cooling of magma in the oceanic lithosphere, chemical components in the magma will be assimilated with those in the lithosphere. Correlation between CO2/3He ratios and carbon isotopic ratios suggests that carbon was affected by the incorporation of seafloor carbonate. The same would be true of noble gases. The mixing of noble gases among a mantle source, an atmospheric component dissolved in seawater and a radiogenic component can explain the data distribution. No 3He/4He ratio exceeds the MORB-like value. The mantle source of the petit-spot magma was likely to have had a MORB-like 3He/4He ratio originally. The eruption of petit-spot magma shows a close relation with the bending of subducting oceanic plates. The MORB-like 3He/4He ratio supports the hypothesis that the petit-spot magma is derived from the lithosphere–asthenosphere boundary. © 2018 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109775
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: The Hokkaido University Museum, Nishi 8, Kita 10, Kita-ku, Sapporo, 060-0810, Japan; Graduate School of Science, Hokkaido University, Kita 10, Nishi 8, Kita-ku, Sapporo, 060-0810, Japan; Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Chiba 277-8564, Japan
Recommended Citation:
Yamamoto J.,Kawano T.,Takahata N.,et al. Noble gas and carbon isotopic compositions of petit-spot lavas from southeast of Marcus Island[J]. Earth and Planetary Science Letters,2018-01-01,497