DOI: 10.1002/2014GL062921
论文题名: A "high 4He/3He" mantle material detected under the East Pacific Rise (15°4′N)
作者: Mougel B. ; Moreira M. ; Agranier A.
刊名: Geophysical Research Letters
ISSN: 0094-8931
EISSN: 1944-8662
出版年: 2015
卷: 42, 期: 5 起始页码: 1375
结束页码: 1383
语种: 英语
英文关键词: EPR
; helium
; hot spot
; isotopes
; mantle geochemistry
; MORB
Scopus关键词: Geochemistry
; Isotopes
; Lead
; Lithology
; Paramagnetic resonance
; Continental lithosphere
; East Pacific Rise
; Geochemical variability
; High spatial resolution
; Hot spot
; Mantle component
; Mantle geochemistries
; MORB
; Helium
; continental lithosphere
; degassing
; helium isotope
; hot spot
; isotopic composition
; isotopic fractionation
; lithosphere
; mantle
; pyroxenite
; sampling
; seamount
; spatial resolution
; East Pacific Rise
; Pacific Ocean
英文摘要: We investigate in details helium isotope data reported in Mougel et al. (2014) for 14 basaltic samples collected on the East Pacific Rise by submersible (15°4′N) where the ridge interacts with the Mathematician seamounts. Samples locations are separated by only few hundred meters across a 15 km along-axis profile. The data reveal a strong geochemical variability that has never been observed at such high spatial resolution for helium isotope compositions. Moreover, they reveal an unusually high 4He/3He mantle component also characterized by unradiogenic lead, atypical in oceanic basalts. He-Pb systematics suggests a mixture between a nonradiogenic lead and radiogenic helium pyroxenitic component, recycled from the deep continental lithosphere and the ambient peridotitic mantle. The He isotope difference between these two end-members can be interpreted as a time evolution of two distinct mantle sources after a slight (U + Th)/3He fractionation, likely due to some ancient degassing during the formation of deep continental pyroxenites. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84925860465&doi=10.1002%2f2014GL062921&partnerID=40&md5=67a20a379782f1d580c7f84b36b35248
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8547
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Institut de Physique du Globe de Paris Sorbonne Paris Cité, CNRS, UMR, Paris, France
Recommended Citation:
Mougel B.,Moreira M.,Agranier A.. A "high 4He/3He" mantle material detected under the East Pacific Rise (15°4′N)[J]. Geophysical Research Letters,2015-01-01,42(5).