DOI: 10.1016/j.epsl.2017.10.018
Scopus记录号: 2-s2.0-85042152370
论文题名: Chromium isotopic homogeneity between the Moon, the Earth, and enstatite chondrites
作者: Mougel B. ; Moynier F. ; Göpel C.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 481 起始页码: 1
结束页码: 8
语种: 英语
英文关键词: chromium isotopes
; cosmogenic effects
; enstatite chondrite
; Moon formation
; neutron capture
Scopus关键词: Chromium
; Cosmology
; Igneous rocks
; Isotopes
; Meteorites
; Cosmogenic
; enstatite chondrite
; Isotopic composition
; Isotopic homogeneity
; Isotopic variations
; Neutron capture
; Protoplanetary disks
; Spallation reactions
; Moon
; chromium
; cosmogenic radionuclide
; Earth
; enstatite chondrite
; homogeneity
; isotopic analysis
; isotopic composition
; Moon
英文摘要: Among the elements exhibiting non-mass dependent isotopic variations in meteorites, chromium (Cr) has been central in arguing for an isotopic homogeneity between the Earth and the Moon, thus questioning physical models of Moon formation. However, the Cr isotopic composition of the Moon relies on two samples only, which define an average value that is slightly different from the terrestrial standard. Here, by determining the Cr isotopic composition of 17 lunar, 9 terrestrial and 5 enstatite chondrite samples, we re-assess the isotopic similarity between these different planetary bodies, and provide the first robust estimate for the Moon. In average, terrestrial and enstatite samples show similar ε54Cr. On the other hand, lunar samples show variables excesses of 53Cr and 54Cr compared to terrestrial and enstatite chondrites samples with correlated ε53Cr and ε54Cr (per 10,000 deviation of the 53Cr/52Cr and 54Cr/52Cr ratios normalized to the 50Cr/52Cr ratio from the NIST SRM 3112a Cr standard). Unlike previous suggestions, we show for the first time that cosmic irradiation can affect significantly the Cr isotopic composition of lunar materials. Moreover, we also suggest that rather than spallation reactions, neutron capture effects are the dominant process controlling the Cr isotope composition of lunar igneous rocks. This is supported by the correlation between ε53Cr and ε54Cr, and 150Sm/152Sm ratios. After correction of these effects, the average ε54Cr of the Moon is indistinguishable from the terrestrial and enstatite chondrite materials reinforcing the idea of an Earth–Moon–enstatite chondrite system homogeneity. This is compatible with the most recent scenarios of Moon formation suggesting an efficient physical homogenization after a high-energy impact on a fast spinning Earth, and/or with an impactor originating from the same reservoir in the inner proto-planetary disk as the Earth and enstatite chondrites and having similar composition. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110166
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: Institut de Physique du Globe de Paris, Université Sorbonne Paris Cité, CNRS UMR 7154, Paris, France; Institut Universitaire de France, Université Paris Diderot, Paris, France
Recommended Citation:
Mougel B.,Moynier F.,Göpel C.. Chromium isotopic homogeneity between the Moon, the Earth, and enstatite chondrites[J]. Earth and Planetary Science Letters,2018-01-01,481