Isotopic and compositional constraints on the source of basalt collected from the lunar farside

• 成果类型: Article
• 署名作者: Che, Xiaochao; Long, Tao; Nemchin, Alexander; Xie, Shiwen; Qiao, Le; Li, Zengsheng; Ban, Yiyi; Fan, Runlong; Yang, Chun; Liu, Dunyi
• 署名单位: China Geological Survey; Institute of Geology, Chinese Academy of Geological Sciences; Chinese Academy of Geological Sciences; China Geological Survey; Chinese Academy of Geological Sciences; Institute of Geology, Chinese Academy of Geological Sciences; Curtin University; Shandong University
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-8894
• DOI: 10.1126/science.adt3332
• 发表日期: 2025-03-21
• 页码: 1306-1310
• 关键词: northwest africa 4734; mare basalts; EVOLUTION; petrogenesis; volcanism; origin; mantle; crystallization; plagioclase; record

摘要

Volcanism on the Moon has produced surface basalt deposits, which record lunar interior processes. The Chang'e-6 mission retrieved samples from the South Pole-Aitken basin (SPA) on the Moon's far side. We analyzed basalt fragments collected by Chang'e-6 and found that their composition resembles that of low-titanium basalts previously sampled by the Apollo missions. Uranium-lead (U-Pb) dating indicated a basalt age of 2823.0 +/- 5.9 million years and a source U-238/Pb-204 ratio (mu-value) of 480 +/- 56. This high mu-value indicates that the source contained materials that formed during the late stages of lunar magma ocean (LMO) crystallization. The results are consistent with the LMO model, but the Chang'e-6 basalt deviates from the trend in Apollo mission samples of younger basalts having higher mu-values. We suggest that this indicates post-LMO modification of the mantle by the SPA impact.