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| DOI | 10.1038/s41561-022-00940-3 |
| Alignment of fractures on Bennu’s boulders indicative of rapid asteroid surface evolution | |
| Delbo M.; Walsh K.J.; Matonti C.; Wilkerson J.; Pajola M.; Al Asad M.M. | |
| 发表日期 | 2022 |
| ISSN | 1752-0894 |
| 起始页码 | 453 |
| 结束页码 | 457 |
| 卷号 | 15期号:6 |
| 英文摘要 | On asteroids, fractures develop due to stresses driven by diurnal temperature variations at spatial scales ranging from sub-millimetres to metres. However, the timescales of such rock fracturing by thermal fatigue are poorly constrained by observations. Here we analyse images of the asteroid (101955) Bennu obtained by the Origins, Spectral Interpretation, Resource Identification and Security-Regolith Explorer (OSIRIS-REx) mission and show that metre-scale fractures on the boulders exposed at the surface have a preferential meridional orientation, consistent with cracking induced by diurnal temperature variations. Using an analytical model of fracture propagation, we suggest that fractures the length of those on Bennu’s boulders can be produced in 104–105 years. This is a comparable or shorter timescale than mass movement processes that act to expose fresh surfaces and reorient boulders and any preferential direction signature. We propose that boulder surface fracturing happens rapidly compared with the lifetime in near-Earth space of Bennu and other carbonaceous asteroids. The damage due to this space-weathering process has consequences for the material properties of these asteroids, with implications for the preservation of the primordial signature acquired during the accretional phases in the protoplanetary disk of our solar system. © 2022, The Author(s), under exclusive licence to Springer Nature Limited. |
| 语种 | 英语 |
| 来源期刊 | Nature Geoscience
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/262196 |
| 作者单位 | Université Côte d’Azur, CNRS, Observatoire de la Côte d’Azur, Laboratoire Lagrange, Nice, France |
| 推荐引用方式 GB/T 7714 | Delbo M.； Walsh K.J.； Matonti C.； Wilkerson J.； Pajola M.； Al Asad M.M.；. Alignment of fractures on Bennu’s boulders indicative of rapid asteroid surface evolution[J],2022,15(6). |
| APA | Delbo M.； Walsh K.J.； Matonti C.； Wilkerson J.； Pajola M.； Al Asad M.M.；.(2022).Alignment of fractures on Bennu’s boulders indicative of rapid asteroid surface evolution.Nature Geoscience,15(6). |
| MLA | Delbo M.； Walsh K.J.； Matonti C.； Wilkerson J.； Pajola M.； Al Asad M.M.；."Alignment of fractures on Bennu’s boulders indicative of rapid asteroid surface evolution".Nature Geoscience 15.6(2022). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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