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- W3094583916 abstract "ABSTRACT In recent years, several studies have shown the importance of thermal fracturing of rocks due to temperature variations, on The Earth and Mars. Rock thermal cracking might also be a process at play on the lunar surface. These temperature variations as well as change rates can reach important amplitude on bodies without an atmosphere, in particular on those that reach small perihelion distances such as near-Earth asteroids. On the other hand, the formation, geometry, and extension of cracks on these bodies have not been fully investigated yet. Here, we show results of thermal cracking laboratory experiments on chondrite meteorites, which develop networks of cracks when subjected to rapid temperature cycles with amplitudes similar to those experienced by asteroids with low perihelion distances. The depth of the cracks can reach a few hundred of microns in some hundreds of temperature cycles, in agreement with theoretical studies. We find that dehydration of hydrous minerals enhances the cracking process. The formation of crack networks increases the porosity both at the surface and in the sub-surface of our specimens. We propose that this process could help explaining the recent finding of the very highly porous surfaces of most of the boulders on the asteroids Ryugu and Bennu." @default.
- W3094583916 created "2020-10-29" @default.
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- W3094583916 date "2020-10-22" @default.
- W3094583916 modified "2023-10-18" @default.
- W3094583916 title "Network of thermal cracks in meteorites due to temperature variations: new experimental evidence and implications for asteroid surfaces" @default.
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- W3094583916 doi "https://doi.org/10.1093/mnras/staa3183" @default.
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