撞击过程对月表氧逸度的改造:来自嫦娥五号月壤中撞击玻璃珠的启示  

Redox condition changes caused by impacts:Insights from Chang’e-5 lunar glass beads

作　　者：庞润连 杨晶 李瑞 刘世荣 李琼 朱丹 杜蔚 刘耘 Runlian Pang;Jing Yang;Rui Li;Shirong Liu;Qiong Li;Dan Zhu;Wei Du;Yun Liu(State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China;Center for Lunar and Planetary Sciences,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China;State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 101408,China;Center for Excellence in Comparative Planetology,Chinese Academy of Sciences,Hefei 230026,China;Research Center for Planetary Science,College of Earth Science,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China [2]Center for Lunar and Planetary Sciences,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China [3]State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China [4]College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 101408,China [5]Center for Excellence in Comparative Planetology,Chinese Academy of Sciences,Hefei 230026,China [6]Research Center for Planetary Science,College of Earth Science,Chengdu University of Technology,Chengdu 610059,China

出　　处：《Science Bulletin》2024年第10期1495-1505,共11页科学通报（英文版）

基　　金：the China National Space Administration(CNSA)for providing the CE-5 lunar sample(CE5C0800YJFM00101GP);supported by the National Natural Science Foundation of China(41773052,41973058,42003054,and 42073062);the China Postdoctoral Science Foundation funded project(2020M680155);the Strategic Priority Research Program of Chinese Academy of Sciences(XDB 41000000);the key research program of frontier sciences of Chinese Academy of Sciences(ZDBS-SSW-JSC007-10);the pre-research Project on Civil Aerospace Technologies(D020201)funded by CNSA.

摘　　要：Lunar materials are overall more reducing compared with their terrestrial counterparts,but the mechanism remains to be elucidated.In this study,we present a possible explanation for the changes in redox state of the lunar regolith caused by impact events,based on our investigations of the impact glass beads from Chang’e-5 mission.These glass beads contain iron metal grains and show concentration gradients of FeO and K_(2)O(with or without Na_(2)O)from their rims to centers.The compositional profiles exhibit errorfunction-like shapes,which indicates a diffusion-limited mechanism.Our numerical modeling results suggest that the iron metal grains on the surface of the glass beads were generated through the reduction of FeO by elemental K and(or)Na produced during the impact events.Meanwhile,the iron metal grains inside the bead may have formed due to oxygen diffusion driven by redox potential gradients.Furthermore,our study suggests that impact processes intensify the local reducing conditions,as evidenced by the presence of calcium sulfide particles within troilite grains that coexist with iron metal grains on the surface of the glass beads.This study provides insights into the oxygen diffusion kinetics during the formation of iron metal spherules and sheds light on the changes in redox conditions of lunar materials caused by impact events.

关 键 词：Chang’e-5 Lunar sample Glass beads Impact Oxygen fugacity Redox change 

分 类 号：P184[天文地球—天文学]