Space weathering on the lunar nearside and farside constrained from Si isotopes

Hui-Yan Zhang, Hui-Min Yu (), Hao-Lan Tang, Yu-Chao Lin, Zicong Xiao, Lin Yang, Jin-Ting Kang, Ji Shen, Liping Qin () and Fang Huang ()
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Hui-Yan Zhang: University of Science and Technology of China
Hui-Min Yu: University of Science and Technology of China
Hao-Lan Tang: University of Science and Technology of China
Yu-Chao Lin: University of Science and Technology of China
Zicong Xiao: University of Science and Technology of China
Lin Yang: University of Science and Technology of China
Jin-Ting Kang: University of Science and Technology of China
Ji Shen: University of Science and Technology of China
Liping Qin: University of Science and Technology of China
Fang Huang: University of Science and Technology of China

Nature Communications, 2025, vol. 16, issue 1, 1-7

Abstract: Abstract Over long timescales, space weathering processes can modify the compositions of surface materials on the Moon. To assess the effects of space weathering of lunar soils, we study Si isotopes of Chang’E-5 (CE-5) and Chang’E-6 (CE-6) returned samples, and lunar meteorites. Here we show that both bulk soils from CE-5 and CE-6 exhibit heavier Si isotopic compositions than the basalt clasts within the soils and lunar meteorites, indicating that the space weathering obviously increase δ30Si of lunar soils. Furthermore, the CE-6 soil from the lunar farside has heavier Si isotopic values than the average of CE-5 soils from the nearside, suggesting that the CE-6 soil has experienced a higher space weathering degree than the CE-5 soils. This increased weathering degree could be attributed to either a longer weathering period or stronger micrometeorite impacts on CE-6 soil from farside compared to CE-5 soils from nearside.

Date: 2025
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DOI: 10.1038/s41467-025-59577-6

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