DOI: 10.1002/2017JE005426
Scopus记录号: 2-s2.0-85040241241
论文题名: Formation Timescales of Amorphous Rims on Lunar Grains Derived From ARTEMIS Observations
作者: Poppe A.R. ; Farrell W.M. ; Halekas J.S.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期: 1 起始页码: 37
结束页码: 46
语种: 英语
英文关键词: amorphous rims
; ion flux
; lunar soil
; solar energetic particles
; space weathering
Scopus关键词: amorphous medium
; deposition
; flux measurement
; ion
; lunar soil
; Moon
; observational method
; spacecraft
; timescale
; weathering
英文摘要: The weathering of airless bodies exposed to space is a fundamental process in the formation and evolution of planetary surfaces. At the Moon, space weathering induces a variety of physical, chemical, and optical changes including the formation of nanometer-sized amorphous rims on individual lunar grains. These rims are formed by vapor redeposition from micrometeoroid impacts and ion irradiation-induced amorphization of the crystalline matrix. For ion irradiation-induced rims, however, laboratory experiments of the depth and formation timescales of these rims stand in stark disagreement with observations of lunar soil grains. We use observations by the Acceleration, Reconnection, Turbulence, and Electrodynamics of the Moon's Interaction with the Sun (ARTEMIS) spacecraft in orbit around the Moon to compute the mean ion flux to the lunar surface between 10 eV and 5 MeV and convolve this flux with ion irradiation-induced vacancy production rates as a function of depth calculated using the Stopping Range of Ions in Matter model. By combining these results with laboratory measurements of the critical fluence for charged-particle amorphization in olivine, we can predict the formation timescale of amorphous rims as a function of depth in olivinic grains. This analysis resolves two outstanding issues: (1) the provenance of >100 nm amorphous rims on lunar grains and (2) the nature of the depth-age relationship for amorphous rims on lunar grains. ©2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114784
Appears in Collections: 气候减缓与适应
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作者单位: Space Sciences Laboratory, University of California, Berkeley, CA, United States; Solar System Exploration Research Virtual Institute, NASA Ames Research Center, Moffett Field, CA, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States; Department of Physics and Astronomy, University of Iowa, Iowa City, IA, United States
Recommended Citation:
Poppe A.R.,Farrell W.M.,Halekas J.S.. Formation Timescales of Amorphous Rims on Lunar Grains Derived From ARTEMIS Observations[J]. Journal of Geophysical Research: Planets,2018-01-01,123(1)