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月壤颗粒微观环带的太空风化成因

DOI: 10.11867/j.issn.1001-8166.2012.06.0603, PP. 603-612

Keywords: 月球,月壤,环带,太空风化

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Abstract:

太空风化是迄今31亿年以来影响月球表面物质演化过程的主要因素,主要包括陨石、微陨石的轰击,太阳风粒子的注入,太阳/银河宇宙射线的辐射以及周期性的加热作用等。通过深入剖析太阳风粒子的注入与溅射、微陨石轰击的蒸发与沉积、宇宙射线辐射的辐射损伤等过程的作用机理,探讨了不同太空风化过程对矿物颗粒环带厚度、化学组成、晶体结构等特征的影响,认为微陨石轰击与太阳风注入是形成月壤颗粒微观环带的主导因素,宇宙射线辐射与周期性加热的影响可忽略不计。进一步结合非晶质环带、富内含物环带、多环环带以及小泡环带等月壤颗粒主要环带的基本特征,在总结和对比分析各类型环带的厚度、结构以及化学组成特征基础上,对不同类型环带的成因进行初步推断,认为非晶质环带、小泡环带以及多环环带的内层环带具有太阳风作用特征,而富内含物环带、多环环带的外层环带则具有微陨石轰击的成因特征。根据目前单纯依靠环带的化学组成分析解释环带成因存在的不足,指出了通过补充分析矿物晶体结构在模拟太空风化实验过程中的变化特征来研究环带成因的新思路。

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