Long-term reduced lunar mantle revealed by Chang’e-5 basalt

IF 14.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES Nature Communications Pub Date : 2024-09-27 DOI:10.1038/s41467-024-52710-x

Huijuan Zhang, Wei Yang, Di Zhang, Hengci Tian, Renhao Ruan, Sen Hu, Yi Chen, Hejiu Hui, Yanhao Lin, Ross N. Mitchell, Di Zhang, Shitou Wu, Lihui Jia, Lixin Gu, Yangting Lin, XianHua Li, Fuyuan Wu

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Abstract

The redox state of a planetary mantle affects its thermal evolution. The redox evolution of lunar mantle, however, remains unclear due to limited oxygen fugacity (fO₂) constraints from young lunar samples. Here, we report vanadium (V) oxybarometers on olivine and spinel conducted on 27 Chang’e-5 basalt fragments from 2.0 billion years ago. These fragments yield an average fO₂ of ΔIW -0.84 ± 0.65 (2σ), which closely aligns with the Apollo samples from 3.6–3.0 billion years ago. This temporal uniformity indicates the lunar mantle remained reduced. This observation reveals that the processes responsible for oxidizing mantles of Earth and Mars either did not occur or had negligible oxidizing effects on the Moon. The long-term reduced mantle may lead to a distinctive volatile degassing pathway for the Moon. It could also make the lunar mantle more difficult to melt, preventing internal heat dissipation and consequently resulting in a slow cooling rate.

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嫦娥五号玄武岩揭示了长期减少的月球地幔

行星地幔的氧化还原状态会影响其热演化。然而，由于来自年轻月球样本的氧富集度（fO2）约束有限，月幔的氧化还原演化仍不清楚。在此，我们报告了在 27 块 20 亿年前的嫦娥五号玄武岩碎片上对橄榄石和尖晶石进行的钒（V）氧棒仪测定。这些碎片的平均 fO2 值为 ΔIW -0.84 ± 0.65 (2σ)，与 36 亿至 30 亿年前的阿波罗样本非常接近。这种时间上的一致性表明月球地幔仍在减少。这一观测结果表明，导致地球和火星地幔氧化的过程要么没有发生，要么对月球的氧化作用微乎其微。长期的还原地幔可能会导致月球独特的挥发性脱气途径。它还可能使月球地幔更难熔化，阻碍内部散热，从而导致冷却速度缓慢。

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来源期刊

Nature Communications Biological Science Disciplines-

CiteScore

24.90

自引率

2.40%

发文量

6928

审稿时长

3.7 months

期刊介绍： Nature Communications, an open-access journal, publishes high-quality research spanning all areas of the natural sciences. Papers featured in the journal showcase significant advances relevant to specialists in each respective field. With a 2-year impact factor of 16.6 (2022) and a median time of 8 days from submission to the first editorial decision, Nature Communications is committed to rapid dissemination of research findings. As a multidisciplinary journal, it welcomes contributions from biological, health, physical, chemical, Earth, social, mathematical, applied, and engineering sciences, aiming to highlight important breakthroughs within each domain.