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DOI | 10.1038/s41561-020-0550-0 |
Distinct oxygen isotope compositions of the Earth and Moon | |
Cano, Erick J.1; Sharp, Zachary D.1; Shearer, Charles K.2 | |
2020-03-09 | |
发表期刊 | NATURE GEOSCIENCE
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ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2020 |
卷号 | 13期号:4页码:270-+ |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
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. High-precision measurements suggest that the Earth and Moon have distinct oxygen isotope compositions. This implies distinct oxygen isotopic compositions of the proto-Earth and its impactor that were not fully homogenized by the Moon-forming impact. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000525726100005 |
WOS关键词 | GIANT IMPACT ; BASALTIC MAGMATISM ; ORIGIN ; FRACTIONATION ; EVOLUTION ; INTERIOR ; MANTLE |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/249303 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Univ New Mexico, Dept Earth & Planetary Sci, Albuquerque, NM 87131 USA; 2.Univ New Mexico, Inst Meteorit, Albuquerque, NM 87131 USA |
推荐引用方式 GB/T 7714 | Cano, Erick J.,Sharp, Zachary D.,Shearer, Charles K.. Distinct oxygen isotope compositions of the Earth and Moon[J]. NATURE GEOSCIENCE,2020,13(4):270-+. |
APA | Cano, Erick J.,Sharp, Zachary D.,&Shearer, Charles K..(2020).Distinct oxygen isotope compositions of the Earth and Moon.NATURE GEOSCIENCE,13(4),270-+. |
MLA | Cano, Erick J.,et al."Distinct oxygen isotope compositions of the Earth and Moon".NATURE GEOSCIENCE 13.4(2020):270-+. |
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