嫦娥五号着陆区的成分特征与遥感地质研究  

Compositional characteristics and remote sensing of regional geology at the Chang’E-5 landing site

作　　者：曹海军 陈剑 乔乐 付晓辉 卢学金[1] 齐晓彬 万晟 凌宗成 刘建忠 CAO HaiJun;CHEN Jian;QIAO Le;FU XiaoHui;LU XueJin;QI XiaoBin;WAN Sheng;LING ZongCheng;LIU JianZhong(Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment,School of Space Science and Physics,Institute of Space Sciences,Shandong University,Weihai 264209,China;Center for Excellence in Comparative Planetology,Chinese Academy of Sciences,Hefei 230026,China;Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China)

机构地区：[1]山东大学空间科学与物理学院,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,威海264209 [2]中国科学院比较行星学卓越创新中心,合肥230026 [3]中国科学院地球化学研究所,贵阳550081

出　　处：《中国科学：物理学、力学、天文学》2023年第3期51-67,共17页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家自然科学基金(编号:41972322,11941001,42102280);中国科学院战略性先导专项(编号:XDB41000000);山东省自然科学基金(编号:ZR2021QD016);民用航天技术预先研究项目(编号:D020102,D020201,D020204);国家重点研发计划(编号:2020YFE0202100,2019YFE0123300)资助。

摘　　要：嫦娥五号任务从月球风暴洋北部地区成功返回了1731 g月壤样品,这些样品为研究月球年轻玄武岩的成因和演化提供了重要的样本.本文利用多源月球遥感探测数据结合嫦娥五号样品研究结果,从光谱学和矿物学角度研究了嫦娥五号着陆区年轻玄武岩的演化过程.嫦娥五号着陆区主要包含雨海纪极低钛到低钛玄武岩和爱拉托逊纪中钛玄武岩,遥感光谱学分析表明年轻玄武岩表现出明显的1μm吸收特征,可能存在橄榄石的富集.然而,返回的嫦娥五号月球样品研究揭示年轻玄武岩中橄榄石的含量并不高,我们推测年轻玄武岩遥感光谱上的1μm强吸收特征可能是富铁辉石、富铁玻璃、空间风化作用和铁橄榄石共同作用的结果.综合已有的样品研究和本文的遥感地质研究,嫦娥五号玄武岩源于高度演化的月球晚期岩浆活动,其源区可能位于富单斜辉石的浅层月幔.Chang’E-5(CE-5)collected 1.731 kg of lunar regolith materials in the northern Oceanus Procellarum.These unique samples complement the Apollo and Luna collections of lunar materials for a better understanding of the petrogenesis and evolution of young mare basalts.This work aims to obtain new knowledge on young mare basalt evolution from spectral and mineralogical perspectives,using the latest multi-source high-resolution orbital datasets in combination with CE-5 sample analysis.The CE-5 landing site is mainly composed of Imbrian-aged basalts with low to very low Ti compositions and Eratosthenian-aged intermediate-Ti basalts.The spectral characteristics of young mare basalts indicate a stronger 1-μm absorption feature and a relatively weak 2-μm absorption,which seem to indicate stronger olivine signatures,possibly suggesting the presence of abundant olivine.However,the returned CE-5 samples revealed lower proportions in olivine abundance than that of Kaguya MI mineral maps.We infer that olivine-rich spectral features in remote sensing datasets are possibly contributed by ferropyroxene,Fe-rich glass,space weathering effects,and fayalite.A synthesis of CE-5 sample analyses and remote geological studies of CE-5 landing site indicates that the Fe-rich young mare basalts may be sourced from the extensive fractional crystallization of late-stage basalt magma from a shallow,clinopyroxene-rich upper mantle cumulate.

关 键 词：嫦娥五号 年轻玄武岩 晚期岩浆活动 橄榄石富集特征 

分 类 号：V476.3[航空宇航科学与技术—飞行器设计] P184.5[天文地球—天文学]