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<p>Impact-cratering is a ubiquitous geologic process on the Moon. The impact-induced mineralogical micro-structures in lunar sample can provide information about their formation conditions on the Moon. However, the interpretation of these micro-structures remains challenging due to the complex and variable nature of impact processes. In this study, a piece of impact ejecta was recognized in Chang’e-5 regolith and characterized using petrographic and geochemical techniques. Using the mineralogical texture (i.e., corona texture around olivine) in such impact ejecta, the formation conditions were constrained to T &gt; 1300&#xa0;°C, stress-free, and a cooling rate 12&#xa0;°C/min. These conditions are different from those previously reported for impact-induced rocks on the Moon, which are typically buried under impact melt sheets and ejecta blankets. These results indicate that lunar impact ejecta exposed at the surface record high-temperature, rapid quenching conditions distinct from buried impact rocks.</p> Graphical Abstract <p></p>

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Unusual corona texture around olivine in Chang’e-5 regolith formed by impact process on the Moon

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月23日

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  • Haojin Hu,
  • Xiaojia Zeng,
  • Jingwen Liu,
  • Yanxue Wu,
  • Yuanyun Wen,
  • Xiongyao Li,
  • Jianzhong Liu

摘要

Impact-cratering is a ubiquitous geologic process on the Moon. The impact-induced mineralogical micro-structures in lunar sample can provide information about their formation conditions on the Moon. However, the interpretation of these micro-structures remains challenging due to the complex and variable nature of impact processes. In this study, a piece of impact ejecta was recognized in Chang’e-5 regolith and characterized using petrographic and geochemical techniques. Using the mineralogical texture (i.e., corona texture around olivine) in such impact ejecta, the formation conditions were constrained to T > 1300 °C, stress-free, and a cooling rate 12 °C/min. These conditions are different from those previously reported for impact-induced rocks on the Moon, which are typically buried under impact melt sheets and ejecta blankets. These results indicate that lunar impact ejecta exposed at the surface record high-temperature, rapid quenching conditions distinct from buried impact rocks.

Graphical Abstract