Ding Chen-Long, Nemchin Alexander, Johnson Tim, Norman Marc D, Guan Yue, Tian Lan-Lan, Xie Wen-Li, Li Lin-Sen, Zhou Sheng-Di, Xu Ke-Xin, Wang Xiao-Lei
State Key Laboratory of Critical Earth Material Cycling and Mineral Deposits, Frontiers Science Center for Critical Earth Material Cycling, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China.
School of Earth and Planetary Sciences, Curtin University, Perth, WA 6845, Australia.
Sci Adv. 2025 May 9;11(19):eadv9019. doi: 10.1126/sciadv.adv9019.
The chemical compositions of most lunar impact glass beads reflect mixing of crustal components including mare basalts, highlands rocks, and KREEP [from high concentrations of K, REE (rare earth element), and P]. However, a few glass beads in the soil from the Chang'e-5 mission have unusually high MgO contents that require distinct target compositions. The young age of these high-MgO glass beads suggests an origin through impact melting of ultramafic target rocks with abundant pyroxene and olivine. While such targets might represent cumulates of mare basalts, impact melts, or Mg-suite rocks, they appear unlike any sampled lunar lithologies. Alternatively, these high-Mg beads might be sampling the upper mantle brought to the surface by the Imbrium basin-forming event.
大多数月球撞击玻璃珠的化学成分反映了地壳成分的混合，包括月海玄武岩、高地岩石和克里普岩（因富含钾、稀土元素和磷而得名）。然而，嫦娥五号任务采集的土壤中的一些玻璃珠具有异常高的氧化镁含量，这需要不同的目标成分。这些高氧化镁玻璃珠形成时间较新，表明其起源于富含辉石和橄榄石的超镁铁质目标岩石的撞击熔融。虽然这些目标可能代表月海玄武岩、撞击熔体或镁质套岩的堆积物，但它们似乎与任何已采样的月球岩性都不同。另外，这些高镁玻璃珠可能是在采集因雨海盆地形成事件而带到地表的上地幔物质。
