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

扫码查看

原文链接

NETL
NSTL
万方数据

外文摘要：Lunar materials are overall more reducing compared with their terrestrial counterparts,but the mecha-nism 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 K2O(with or without Na2O)from their rims to centers.The compositional profiles exhibit error-function-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 evi-denced 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.

外文关键词：

Chang'e-5Lunar sampleGlass beadsImpactOxygen fugacityRedox change

作者：

Runlian Pang、Jing Yang、Rui Li、Shirong Liu、Qiong Li、Dan Zhu、Wei Du、Yun Liu

展开 >

作者单位：

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

展开 >

基金：

China National Space Administration(CNSA)for providing the CE-5 lunar sample国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金中国博士后科学基金中国科学院战略规划重点项目中国科学院前沿科学重点研究计划Preresearch project on Civil Aerospace Technologies funded by CNSA

项目编号：

CE5C0800YJFM00101GP417730524197305842003054420730622020M680155XDB 41000000ZDBS-SSW-JSC007-10D020201

出版年：

2024

DOI：

10.1016/j.scib.2024.03.004

科学通报(英文版)

中国科学院

科学通报(英文版)

CSTPCD

ISSN：1001-6538

年,卷(期)：2024.69(10)

参考文献量56