气候变化领域集成服务门户(CCPortal): Distinct oxygen isotope compositions of the Earth and Moon

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DOI	10.1038/s41561-020-0550-0
	Distinct oxygen isotope compositions of the Earth and Moon
	Cano E.J.; Sharp Z.D.; Shearer C.K.
发表日期	2020
ISSN	17520894
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.
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124519
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
推荐引用方式 GB/T 7714	Cano E.J.,Sharp Z.D.,Shearer C.K.. Distinct oxygen isotope compositions of the Earth and Moon[J],2020.
APA	Cano E.J.,Sharp Z.D.,&Shearer C.K..(2020).Distinct oxygen isotope compositions of the Earth and Moon.Nature Geoscience.
MLA	Cano E.J.,et al."Distinct oxygen isotope compositions of the Earth and Moon".Nature Geoscience (2020).