“嫦娥三号”着陆区月壤下伏玄武岩单元划分和充填过程研究

发布时间：2018-01-30 20:02

本文关键词： “嫦娥三号” 着陆区下伏玄武岩单元划分充填过程　出处：《地学前缘》2014年06期 　论文类型：期刊论文

【摘要】：月球在演化过程中,几乎没有经历过大气或流水等地质作用,在全月范围覆盖有表层土壤,极少有下伏岩石裸露。经过数十亿年的空间风化作用,月海月壤光谱特性与下伏玄武岩有很大差别。因此,通过常规遥感方法不能探知下伏玄武岩的特性。了解月球岩石的关键是透过干扰的月壤看到下伏岩石的信息。通过对"嫦娥三号"着陆区低成熟度撞击坑坑底和坑壁位置的光谱分析,进行月壤下伏玄武岩的组分识别、单元划分并根据地形数据计算其厚度。具体内容包括:(1)基于LISM多光谱遥感数据的撞击坑筛选与光谱信息提取;(2)玄武岩单元类型划分和厚度反演,建立离散撞击坑与连续的地质单元之间的关系。结果表明,研究区至少发生了6期玄武岩溢出充填活动,由新到老可以依次划分出6种玄武岩单元。其中单元1、2和3的厚度从南向北逐渐减小最后消失;单元4、5和6可能分布于整个研究区,在南部区域被前3期玄武岩单元覆盖,没有暴露在月表,在北部区域则位于下伏玄武岩的顶层。从元素含量上看,不同玄武岩单元Ti质量分数变化较大,从最低的1.26%到最高的6.65%,而Fe质量分数相对变化较小,在16.31%到17.57%。最后,玄武岩填充时间与其Fe、Ti元素含量之间有一定的联系,玄武岩年代越年轻,其中的Fe和Ti元素更加富集。
[Abstract]:During the evolution of the moon, there were few geological processes such as the atmosphere or income, covering the surface soil throughout the moon, and very few underlying rocks exposed. After billions of years of spatial weathering. The spectral characteristics of lunar soil are very different from those of underlying basalt. The characteristics of underlying basalt can not be detected by conventional remote sensing. The key to understanding lunar rocks is to see the information of underlying rocks through disturbed lunar soil. Spectral analysis of low maturity crater bottom and crater wall location in landing area. The components of the basalt under lunar soil are identified, the units are divided and the thickness is calculated according to the topographic data. The specific contents include: 1) screening of impact craters and extraction of spectral information based on LISM multispectral remote sensing data; The relationship between discrete impact craters and continuous geological units is established. The results show that at least six periods of basalt spillage and filling occurred in the study area. From new to old, six basalt units can be divided in turn, in which the thickness of units 1 / 2 and 3 gradually decreases from south to north and then disappears. Units 4, 5 and 6 may be distributed throughout the study area, covered by the previous three basalt units in the southern region, not exposed to the monthly surface, and located at the top of the underlying basalt in the northern region. The Ti mass fraction of different basalt units varies greatly, from the lowest 1.26% to the highest 6.65, while the Fe mass fraction is relatively small, ranging from 16.31% to 17.577.Finally. There is a certain relationship between the filling time of basalt and the content of Fe and Ti in basalt. The younger the age of basalt is, the more Fe and Ti are enriched.
【作者单位】：山东大学空间科学研究院;山东省光学天文与日地空间环境重点实验室;中国科学院月球与深空探测重点实验室;
【基金】：国家自然科学基金项目(11003012,U1231103,41373068,41473065) 山东省自然科学基金项目(ZR2011AQ001) 中国科学院重点部署项目(KGZD-EW-603) 中国科学院月球与深空探测重点实验室开放基金项目山东大学威海校区校科研启动基金项目
【分类号】：P184.5
【正文快照】： LI Bo1,LING Zongcheng1,2,*,ZHANG Jiang1,WU Zhongchen1,NI Yuheng1,CHEN Jian11.Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestiral Environment;Insitute of Space Sciences,ShandongUniversity,Weihai 264209,China2.Key Laboratory of Lu

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