首页|Higher water content observed in smaller size fraction of Chang'e-5 lunar regolith samples

Higher water content observed in smaller size fraction of Chang'e-5 lunar regolith samples

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Water has been detected in lunar regolith,with multiple sources identified through the analysis of indi-vidual grains.However,the primary origin of water in the bulk lunar regolith remains uncertain.This study presents spectroscopic analyses of water content in sealed Chang'e-5 samples.These samples were sieved into various size fractions(bulk,＜45 pm,and 45-355 pm)inside a glovebox filled with high-purity nitrogen.Results indicate a higher water content in the fine fractions(～87±11.9 ppm)than in bulk soil(～37±4.8 ppm)and coarse fractions(～11±1.5 ppm).This suggests that water is predominantly concen-trated in the outermost rims of the regolith grains,and thus exhibits dependence on the surface volume ratio(also known as surface correlation),indicating solar wind is a primary source of lunar surface water.Laboratory,in-situ,and orbital results bridge sample analysis and remote sensing,offering a cohesive understanding of lunar surface water characteristics as represented by Chang'e-5.The discovery provides statistical evidence for the origin of water in lunar soil and can be considered representative of the lunar surface conditions.The water enrichment of the finest fraction suggests the feasibility of employing size sorting of lunar soils as a potential technological approach for water resource extraction in future lunar research stations.

Chang'e-5 sampleWaterSolar windSize-dependentSpectra

Honglei Lin、Rui Xu、Shuai Li、Rui Chang、Hejiu Hui、Yang Liu、Hengci Tian、Kai Fan、Zhiping He、Huaiyu He、Wei Yang、Yangting Lin、Yong Wei

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Key Laboratory of Earth and Planetary Physics,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China

Key Laboratory of Space Active Opto-Electronics Technology,Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083,China

Hawaii Institute of Geophysics and Planetology,University of Hawai'i at Mānoa,Honolulu,HI 96822,USA

State Key Laboratory for Mineral Deposits Research and Lunar and Planetary Science Institute,School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023,China

State Key Laboratory of Space Weather,National Space Science Center,Chinese Academy of Sciences,Beijing 100190,China

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2024

10.1016/j.scib.2024.05.031

科学通报(英文版)
中国科学院

科学通报(英文版)

CSTPCD
ISSN：1001-6538
年,卷(期)：2024.69(23)