基于嫦娥五号月壤玻璃揭示月表金属铁的起源研究  

Origins of Lunar Metallic Iron Revealed by Lunar Glasses in Chang'e-5 Samples

作　　者：常超 赵睿 沈来权 白海洋[1,2] 汪卫华 CHANG Chao;ZHAO Rui;SHEN Laiquan;BAI Haiyang;WANG Weihua(Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;Songshan Lake Materials Laboratory,Dongguan 523808,China)

机构地区：[1]中国科学院物理研究所,北京100190 [2]松山湖材料实验室,东莞523808

出　　处：《空间科学与试验学报》2024年第3期17-25,共9页Journal of Space Science and Experiment

摘　　要：月球等无大气天体表面在(微)陨石撞击、太阳风辐照等极端太空环境作用下会发生太空风化,积累产生尺寸从纳米到微米不等的金属铁颗粒。这些金属铁颗粒的存在会显著改变天体表面的光谱特征,这种光谱改造效应会随着金属铁颗粒尺寸的不同而变化,为准确解读天体的遥感数据带来了巨大挑战。尽管经过几十年的研究,不同尺寸的金属铁颗粒形成机制仍未得到明确解答。本文通过对我国嫦娥五号月壤中的玻璃物质进行系统的显微分析,以具有明确撞击成因的旋转形状玻璃珠为切入点,成功区分了在玻璃珠凝固前后分别形成的大、小粒径金属铁颗粒,并证明它们分别源自(微)陨石撞击和太阳风辐照过程,揭示了(微)陨石撞击和太阳风辐照这两种太空环境在太空风化中各自的独特作用,深化了对空间环境与月表物质相互作用机制的理解,并为预测不同太空环境下的风化行为提供了重要的科学依据。Space weathering,including micrometeorite impacts and solar wind irradiation,leads to the formation of metallic iron particles that range in size from nanometers to micrometers.These particles are commonly found on the surfaces of airless bodies,such as the Moon.Their presence significantly alters the spectral properties of the lunar surface,and the resultant optical effects vary depending on the particle size,making accurate interpretation of remote sensing data challenging.Despite decades of research,the formation mechanisms of metallic iron particles of different sizes remain unresolved.In this study,we conducted a systematic microscopic analysis of glasses from China's Chang'e-5 lunar soil samples,focusing on impact glass beads with well-defined impact origins and rotational features.We successfully distinguish large and small metallic iron particles formed before and after the solidification of these glass beads,clarifying them as products of micrometeorite impacts and solar wind irradiation,respectively.This research highlights the distinct roles of impacts and irradiation in space weathering,enhancing our understanding of the interaction between space environments and the lunar surface,and offering valuable insights for predicting weathering behavior under different space conditions.

关 键 词：金属铁 太空风化 微陨石撞击 太阳风辐照 光谱改造 

分 类 号：P691[天文地球—地质学]