DOI: 10.1016/j.epsl.2020.116069
论文题名: An endogenic origin of cerean organics
作者: Bowling T.J. ; Johnson B.C. ; Marchi S. ; De Sanctis M.C. ; Castillo-Rogez J.C. ; Raymond C.A.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 534 语种: 英语
中文关键词: 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
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 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164883
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Bowling T.J.,Johnson B.C.,Marchi S.,et al. An endogenic origin of cerean organics[J]. Earth and Planetary Science Letters,2020-01-01,534