Formation and growth of nanophase iron particles on the surface of Mercury revealed by experimental study

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外文标题：Formation and growth of nanophase iron particles on the surface of Mercury revealed by experimental study

外文摘要：Space weathering is a primary factor in altering the composition and spectral characteristics of surface mate-rials on airless planets.However,current research on space weathering focuses mainly on the Moon and certain types of asteroids.In particular,the impacts of meteoroids and micro-meteoroids,radiation from solar wind/solar flares/cosmic rays,and thermal fatigue due to temperature variations are being studied.Space weathering produces various transfor-mation products such as melted glass,amorphous layers,iron particles,vesicles,and solar wind water.These in turn lead to soil maturation,changes in visible and near-infrared reflectance spectra(weakening of characteristic absorption peaks,decreased reflectance,increased near-infrared slope),and alterations in magnetism(related to small iron particles),collectively termed the"lunar model"of space weather-ing transformation.Compared to the Moon and asteroids,Mercury has unique spatial environmental characteristics,including more intense meteoroid impacts and solar thermal radiation,as well as a weaker particle radiation environment due to the global distribution of its magnetic field.There-fore,the lunar model of space weathering may not apply to Mercury.Previous studies have extensively explored the effects of micrometeoroid impacts.Hence,this work focuses on the effects of solar-wind particle radiation in global magnetic-field distribution and on the weathering transfor-mation of surface materials on Mercury under prolonged intense solar irradiation.Through the utilization of high-valence state,heavy ion implantation,and vacuum heating simulation experiments,this paper primarily investigates the weathering transformation characteristics of the major mineral components such as anorthite,pyroxene,and olivine on Mercury's surface and compares them to the weathering transformation model of the Moon.The experimental results indicate that ion implantation at room temperature is insuf-ficient to generate np-Fe0 directly but can facilitate its for-mation,while prolonged exposure to solar thermal radiation on Mercury's surface can lead directly to the formation of np-Fe0.Therefore,intense solar thermal radiation is a crucial component of the unique space weathering transformation process on Mercury's surface.

外文关键词：

MercurySpace weatheringNp-Fe0Solar thermal radiationSolar wind

作者：

Ronghua Pang、Yang Li、Chen Li、Pengfei Zhang、Zhuang Guo、Sizhe Zhao、Han Yu、Li Wang、Chenxi Zhu、Shuangyu Wang、Kairui Tai、Qinwei Zhang、Yuanyun Wen、Rui Li

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作者单位：

Center for Lunar and Planetary Sciences,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,China

University of Chinese Academy of Sciences,Beijing,China

Center for Excellence in Comparative Planetology,Chinese Academy of Sciences,Hefei,China

Institute of Remote Sensing and Geographical Information System,School of Earth and Space Sciences,Peking University,Beijing,China

State Key Laboratory of Lunar and Planetary Sciences,Macau University of Science and Technology,Macau,China

Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming,China

State Key Laboratory of High Performance Ceramics and Superfine Microstructures,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai,China

Laboratory for Space Environment and Physical Sciences,Harbin Institute of Technology,Harbin,China

Research Center for Planetary Science,College of Earth Science,Chengdu University of Technology,Chengdu,China

Key Laboratory of Planetary Sciences,Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing,China

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关键词：

Mercury Space weathering Np-Fe0 Solar thermal radiation Solar wind

出版年：

2024

DOI：

10.1007/s11631-024-00699-x

地球化学学报(英文版)

中国科学院地球化学研究所

地球化学学报(英文版)

影响因子：0.33

ISSN：2096-0956

年,卷(期)：2024.43(4)