Space weathering of iron sulfides in the lunar surface environment
Space weathering of iron sulfides in the lunar surface environment
复制标题
月球表面环境中硫化铁的空间风化
DOI:
10.1016/j.gca.2021.02.013
复制
发表时间:
2021
影响因子:
5
通讯作者:
Hidaka Hiroshi
中科院分区:
文献类型:
--
作者:
Matsumoto Toru;Noguchi Takaaki;Tobimatsu Yu;Harries Dennis;Langenhorst Falko;Miyake Akira;Hidaka Hiroshi
Alteration of iron sulfides on the lunar surface by space weathering is poorly understood. We examined space weathering features of iron sulfides in lunar mature soil grains using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). SEM observations reveal that iron sulfides have vesicular textures and iron whiskers on their surfaces. Iron sulfides observed using TEM are troilite and NC-pyrrhotite. The space-weathered rim on the iron sulfides is characterized by crystallographic misorientations and the disappearance of superstructure reflections of troilite in electron diffraction patterns. These crystallographic modifications are probably produced by solar wind irradiation. The rim contains opened vesicles that are aligned along thec-plane of the sulfides, as well as numerous tiny vesicles. The Fe/S ratio at the surface of the rim is higher than in non-altered regions, indicating selective sulfur loss from the surface. Iron whiskers protrude from the space weathered rim and consist of polycrystalline metallic iron. The sulfide rims and the iron whiskers are both coated with vapor-deposited materials rich in O and Si. The combined processes driven by the solar wind irradiation, heating during impact events, solar UV radiation, and the thermal cycling may cause vesicular textures, selective sulfur escape from the iron sulfides, and the formation of the iron whiskers. The rim textures support the notion that the enrichment of heavy sulfur isotopes in mature lunar soils is caused by space weathering of iron sulfides. The space weathered rims on lunar iron sulfides are similar to those observed in regolith samples from asteroid Itokawa. Therefore, alterations of sulfide surface might be common among airless bodies in the solar system.
登录
查看更多内容
DOI:
--
发表时间:
1972
期刊:
影响因子:
--
作者:
G. E. Rees;H. Thode
通讯作者:
H. Thode
DOI:
10.1111/maps.12648
发表时间:
2016
期刊:
影响因子:
--
作者:
D. Harries;M. Zolensky
通讯作者:
M. Zolensky
DOI:
10.1016/0016-7037(75)90167-2
发表时间:
1975
期刊:
--
影响因子:
--
作者:
I. Kaplan;J. Kerridge;C. Petrowski
通讯作者:
C. Petrowski
影响因子:
5
作者:
C. E. McEwinct;H. Thode;C. Rees
通讯作者:
C. Rees
DOI:
--
发表时间:
2011
期刊:
影响因子:
--
作者:
R. Christoffersen;L. Keller
通讯作者:
L. Keller