气候变化领域集成服务门户(CCPortal): An endogenic origin of cerean organics

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DOI	10.1016/j.epsl.2020.116069
	An endogenic origin of cerean organics
	Bowling T.J.; Johnson B.C.; Marchi S.; De Sanctis M.C.; Castillo-Rogez J.C.; Raymond C.A.
发表日期	2020
ISSN	0012821X
卷号	534
英文摘要	Localized deposits of aliphatic organic-rich material have been found on the surface of dwarf planet Ceres, and based on mineralogical context, it has been suggested that these organics formed within Ceres (De Sanctis et al., 2017). However, no obvious source and exposure mechanism can be inferred from the geological settings of the organic-rich terrains. The alternative hypothesis is that the organics were delivered from an exogenic source via impact (Pieters et al., 2018). We numerically simulate the thermal degradation of aliphatic organics delivered to Ceres during hypervelocity impacts, as well as the thermal degradation and excavation of organics from the subsurface. Our models show that exogenic delivery of aliphatic organics is inefficient, as most of the spectral signature of the organic species would be thermally degraded and diluted by mixing with target material in the ejecta blanket of a given crater. Instead, our models suggest that the formation of Ernutet crater excavated a subsurface reservoir of aliphatic organics from a depth of 3-6 km, bringing it close to the surface, where it could be subsequently exhumed by small craters and landslides, compatible with observations. © 2020
关键词	Ceres impacts survival of aliphatic organics
英文关键词	Geology; Alternative hypothesis; Ceres; Exposure mechanism; Hypervelocity impacts; impacts; Organics; Spectral signature; Subsurface reservoir; Mathematical models; asteroid; extraterrestrial matter; formation mechanism; impact; impact structure; mineralogy; organic geochemistry; terrain; Cereeae; Ceres
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202505
作者单位	Southwest Research Institute, 1050 Walnut Street, Boulder, CO 80302, United States; Department of Earth, Atmospheric and Planetary Sciences, Purdue University, West Lafayette, IN 47907, United States; Istituto di Astrofisica e Planetologia Spaziali, Istituto Nazionale di Astrofisica, Roma, 00133, Italy; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, United States
推荐引用方式 GB/T 7714	Bowling T.J.,Johnson B.C.,Marchi S.,et al. An endogenic origin of cerean organics[J],2020,534.
APA	Bowling T.J.,Johnson B.C.,Marchi S.,De Sanctis M.C.,Castillo-Rogez J.C.,&Raymond C.A..(2020).An endogenic origin of cerean organics.Earth and Planetary Science Letters,534.
MLA	Bowling T.J.,et al."An endogenic origin of cerean organics".Earth and Planetary Science Letters 534(2020).