DOI: 10.1038/s41561-020-0550-0
论文题名: Distinct oxygen isotope compositions of the Earth and Moon
作者: Cano E.J. ; Sharp Z.D. ; Shearer C.K.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2020
卷: 13, 期: 4 起始页码: 270
结束页码: 274
语种: 英语
英文关键词: Earth
; isotopic analysis
; isotopic composition
; lithology
; lunar mantle
; magma
; Moon
; precision
; quantitative analysis
英文摘要: The virtually identical oxygen isotope compositions of the Earth and Moon revealed by Apollo return samples have been a challenging constraint for lunar formation models. For a giant impact scenario to explain this observation, either the precursors to the Earth and Moon had identical oxygen isotope values or extensive homogenization of the two bodies occurred following the impact event. Here we present high-precision oxygen isotope analyses of a range of lunar lithologies and show that the Earth and Moon in fact have distinctly different oxygen isotope compositions. Oxygen isotope values of lunar samples correlate with lithology, and we propose that the differences can be explained by mixing between isotopically light vapour, generated by the impact, and the outermost portion of the early lunar magma ocean. Our data suggest that samples derived from the deep lunar mantle, which are isotopically heavy compared to Earth, have isotopic compositions that are most representative of the proto-lunar impactor ‘Theia’. Our findings imply that the distinct oxygen isotope compositions of Theia and Earth were not completely homogenized by the Moon-forming impact, thus providing quantitative evidence that Theia could have formed farther from the Sun than did Earth. © 2020, The Author(s), under exclusive licence to Springer Nature Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169569
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM, United States; Institute of Meteoritics, University of New Mexico, Albuquerque, NM, United States
Recommended Citation:
Cano E.J.,Sharp Z.D.,Shearer C.K.. Distinct oxygen isotope compositions of the Earth and Moon[J]. Nature Geoscience,2020-01-01,13(4)