Reactions of atmospheric vapors with lunar soil

Computer Science

Scientific paper

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Hydration, Lunar Soil, Water Vapor, Adsorption, Clays, Dehydration, Fines, Silicates, Surface Properties, Weathering

Scientific paper

Inert vapor adsorption was employed to measure the surface properties and changes wrought in the hydration-dehydration of lunar fines. Plausible mechanisms were considered and the predominant process involves hydration of the metamict metallosilicate surfaces to form a hydrated laminar structure akin to terrestrial clays. Additional credence for this interpretation is obtained by comparison to terrestrial weathering of primary metallosilicates. The surface properties of the hydrated lunar fines are compared favorably to those of terrestrial clay minerals. In addition, experimental results are given to show that fresh disorded surfaces of volcanic sand react with water vapor in a manner virturally identical to the majority of the lunar fines. The results show that ion track etching and/or grain boundary attack are minor contributions in the weathering of lunar fines in the realm of our microgravimetric experimental conditions.

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