资源环境科技发展态势分析平台

China’s Chang’e‐5 (CE‐5) has returned 1.731 kg lunar samples from a young mare unit on December, 2020. In this study, we conducted a spatially‐resolved numerical model, which considers both impact mixing and volcanic effusion, to estimate the evolving distribution of components over the landing region. Using this model, the age composition of surface scooped and sub‐surface drilled CE‐5 samples and their sources were traced back. Our model predicts that local mare material predominates in both surface and sub‐surface samples and the non‐local mare component is ∼1%. There is ∼ 40% of non‐mare component. The composition of non‐mare components in the surface and sub‐surface samples is similar: Abundant components are basin‐sourced melts, where the Imbrium melt are ∼ 25% among all the melt. The ejecta of Sharp B, Harding, Copernicus, and Aristarchus crater that possess different compositions of basin‐sourced melt may have significantly altered the material composition of the landing surface.