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Chang’e-5 samples reveal two-billion-year-old volcanic activity on the Moon and its source characteristics

Science China Earth Sciences 2021年第12期64卷 2083-2089页

作者： Shoujie LIU Qin ZhOU Qiuli LI Sen hU Wei YANG Institute of Geology Chinese Academy of Geological SciencesBeijing100037China National Astronomical Observatories Chinese Academy of SciencesBeijing100101China Institute of Geology and Geophysics Chinese Academy of SciencesBeijing100029China

The Chang’e-5 mission returned new lunar samples after the last sample mission of the Moon 44 years ago,and is also the first mission that China has completed the sampling of extraterrestrial ***,independent teams from the Institute of Geology,Chinese Academy of Geological Sciences,and the National Astronomical Observatories and the Institute of Geology and Geophysics,Chinese Academy of Sciences reported the first batch of results of Chang’e-5 lunar *** basic physical properties of the Chang’e-5 soil are within the range of the Apollo and Luna samples though the Chang’e-5 soil is finer-grained,better sorted,and has a slightly lower true density than the mare basalt previosuly *** Pb-Pb dating of U-rich minerals in the Chang’e-5 basalt clasts indicated that they formed at about 2.0 Ga,800 million years younger than the youngest lunar sample recovered previously(2.8 Ga),confirming that lunar volcanic activity can last at least until 2 ***-situ Sr-Nd isotope analyses suggested that the Chang’e-5 basalt originated from a depleted mantle *** contribution of the KREEP component is less than 5%,which excluded the hypothesis that KREEP-rich sources provide an additional heat source for mantle *** addition,water contents and h isotopes of apatite and melt inclusions of the Chang’e-5 basalt suggested that the source region is not rich in water which can lower the melting ***,the reason why lunar volcanic activity can last so long is still unclear,which is a new direction for future lunar exploration and research.

关键词： Chang'e-5 Lunar soil Basalt Pb-Pb dating Sr-Nd isotopes Water h isotope

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