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Hu, Sen; He, Huicun; Ji, Jianglong; Lin, Yangting; Hui, Hejiu; Anand, Mahesh; Tartèse, Romain; Yan, Yihong; Hao, Jialong; Li, Ruiying; Gu, Lixin; Guo, Qian; He, Huaiyu; Ouyang, Ziyuan
Nature (London), 12/2021, Volume: 600, Issue: 7887Journal Article
The distribution of water in the Moon's interior carries implications for the origin of the Moon , the crystallization of the lunar magma ocean and the duration of lunar volcanism . The Chang'e-5 mission returned some of the youngest mare basalt samples reported so far, dated at 2.0 billion years ago (Ga) , from the northwestern Procellarum KREEP Terrane, providing a probe into the spatiotemporal evolution of lunar water. Here we report the water abundances and hydrogen isotope compositions of apatite and ilmenite-hosted melt inclusions from the Chang'e-5 basalts. We derive a maximum water abundance of 283 ± 22 μg g and a deuterium/hydrogen ratio of (1.06 ± 0.25) × 10 for the parent magma. Accounting for low-degree partial melting of the depleted mantle followed by extensive magma fractional crystallization , we estimate a maximum mantle water abundance of 1-5 μg g , suggesting that the Moon's youngest volcanism was not driven by abundant water in its mantle source. Such a modest water content for the Chang'e-5 basalt mantle source region is at the low end of the range estimated from mare basalts that erupted from around 4.0 Ga to 2.8 Ga (refs. ), suggesting that the mantle source of the Chang'e-5 basalts had become dehydrated by 2.0 Ga through previous melt extraction from the Procellarum KREEP Terrane mantle during prolonged volcanic activity.
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