Guo Zhuang, Li Chen, Li Yang, Wu Yanxue, Zhu Chenxi, Wen Yuanyun, Fa Wenzhe, Li Xiongyao, Liu Jianzhong, Ouyang Ziyuan
Institute of Remote Sensing and Geographical Information System, School of Earth and Space Sciences, Peking University, Beijing 100871, China; Center for Lunar and Planetary Sciences, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China.
Center for Lunar and Planetary Sciences, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China; Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China.
Sci Bull (Beijing). 2023 Apr 15;68(7):723-729. doi: 10.1016/j.scib.2023.03.020. Epub 2023 Mar 13.
Frequent impacts on the Moon have changed the physical and chemical properties of the lunar regolith, with new materials deposited from the impact-induced vapor phase. Here, we combined nanoscale chemical and structural analysis to identify the mineral digenite (4CuS·CuS) in Chang'e-5 lunar soil. This is the first report of digenite in a lunar sample. The surface-correlated digenite phase is undifferentiated in distribution and compositionally distinct from its hosts, suggesting that it originated from vapor-phase deposition. The presence of an Al-rich impact glass bead suggests that a thermal effect provided by impact ejecta is the main heat source for the evaporation of Cu-S components from a cupriferous troilite precursor, and the digenite condensed from these Cu-S vapors. A large pure metallic iron (Fe) particle and high Cu content within the studied Cu-Fe-S grain suggest that this grain was most likely derived from a highly differentiated and reduced melt.
对月球的频繁撞击改变了月壤的物理和化学性质，撞击产生的气相中沉积了新的物质。在这里，我们结合纳米级化学和结构分析，在嫦娥五号月球土壤中鉴定出矿物辉铜矿（4CuS·CuS）。这是首次在月球样本中报告辉铜矿。与表面相关的辉铜矿相在分布上没有差异，且在成分上与其宿主不同，这表明它起源于气相沉积。富含铝的撞击玻璃珠的存在表明，撞击喷出物提供的热效应是从含铜陨硫铁前驱体中蒸发铜 - 硫成分的主要热源，辉铜矿则由这些铜 - 硫蒸气冷凝而成。研究的铜 - 铁 - 硫颗粒中存在一个大的纯金属铁（Fe）颗粒和高铜含量，这表明该颗粒很可能来自高度分异和还原的熔体。
