Space weathering of iron sulfides in the lunar surface environment
نویسندگان
چکیده
Alteration of iron sulfides on the lunar surface by space weathering is poorly understood. We examined features in mature soil grains using scanning electron microscopy (SEM) and transmission (TEM). SEM observations reveal that have vesicular textures whiskers their surfaces. Iron observed TEM are troilite NC-pyrrhotite. The space-weathered rim characterized crystallographic misorientations disappearance superstructure reflections diffraction patterns. These modifications probably produced solar wind irradiation. contains opened vesicles aligned along c-plane sulfides, as well numerous tiny vesicles. Fe/S ratio at higher than non-altered regions, indicating selective sulfur loss from surface. protrude weathered consist polycrystalline metallic iron. sulfide rims both coated with vapor-deposited materials rich O Si. combined processes driven irradiation, heating during impact events, UV radiation, thermal cycling may cause textures, escape formation whiskers. support notion enrichment heavy isotopes soils caused sulfides. similar to those regolith samples asteroid Itokawa. Therefore, alterations might be common among airless bodies system.
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ژورنال
عنوان ژورنال: Geochimica et Cosmochimica Acta
سال: 2021
ISSN: ['1872-9533', '0016-7037']
DOI: https://doi.org/10.1016/j.gca.2021.02.013