气候变化领域集成服务门户(CCPortal): Alignment of fractures on Bennu's boulders indicative of rapid asteroid surface evolution

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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, Marco; Walsh, Kevin J.; Matonti, Christophe; Wilkerson, Justin; Pajola, Maurizio; Al Asad, Manar M.; Avdellidou, Chrysa; Ballouz, Ronald-Louis; Bennett, Carina A.; Connolly, Harold C., Jr.; DellaGiustina, Daniella N.; Golish, Dathon R.; Molaro, Jamie L.; Rizk, Bashar; Schwartz, Stephen R.; Lauretta, Dante S.
发表日期	2022
ISSN	1752-0894
EISSN	1752-0908
起始页码	453
结束页码	+
卷号	15 期号:6 页码:18
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 10(4)-10(5) 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. Fractures on the asteroid Bennu imaged by the OSIRIS-REx spacecraft are consistent with cracking induced by diurnal temperature variations over geologically rapid timescales.
学科领域	Geosciences, Multidisciplinary
语种	英语
WOS研究方向	Geology
WOS记录号	WOS:000800992700002
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/272483
作者单位	Centre National de la Recherche Scientifique (CNRS); UDICE-French Research Universities; Universite Cote d'Azur; Observatoire de la Cote d'Azur; Southwest Research Institute; Centre National de la Recherche Scientifique (CNRS); UDICE-French Research Universities; Universite Cote d'Azur; Observatoire de la Cote d'Azur; Texas A&M University System; Texas A&M University College Station; University of British Columbia; University of Arizona; Rowan University
推荐引用方式 GB/T 7714	Delbo, Marco,Walsh, Kevin J.,Matonti, Christophe,et al. Alignment of fractures on Bennu's boulders indicative of rapid asteroid surface evolution[J],2022,15(6):18.
APA	Delbo, Marco.,Walsh, Kevin J..,Matonti, Christophe.,Wilkerson, Justin.,Pajola, Maurizio.,...&Lauretta, Dante S..(2022).Alignment of fractures on Bennu's boulders indicative of rapid asteroid surface evolution.NATURE GEOSCIENCE,15(6),18.
MLA	Delbo, Marco,et al."Alignment of fractures on Bennu's boulders indicative of rapid asteroid surface evolution".NATURE GEOSCIENCE 15.6(2022):18.