globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2743
论文题名:
Composition and structure of the shallow subsurface of Ceres revealed by crater morphology
作者: Bland M.T.; Raymond C.A.; Schenk P.M.; Fu R.R.; Kneissl T.; Pasckert J.H.; Hiesinger H.; Preusker F.; Park R.S.; Marchi S.; King S.D.; Castillo-Rogez J.C.; Russell C.T.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期:7
起始页码: 538
结束页码: 542
语种: 英语
Scopus关键词: concentration (composition) ; crater ; geological structure ; geomorphology ; ice cover ; image analysis ; planet ; planetary evolution ; planetary surface ; simulation ; surface layer ; Ceres
英文摘要: Before NASA's Dawn mission, the dwarf planet Ceres was widely believed to contain a substantial ice-rich layer below its rocky surface. The existence of such a layer has significant implications for Ceres's formation, evolution, and astrobiological potential. Ceres is warmer than icy worlds in the outer Solar System and, if its shallow subsurface is ice-rich, large impact craters are expected to be erased by viscous flow on short geologic timescales. Here we use digital terrain models derived from Dawn Framing Camera images to show that most of Ceres's largest craters are several kilometres deep, and are therefore inconsistent with the existence of an ice-rich subsurface. We further show from numerical simulations that the absence of viscous relaxation over billion-year timescales implies a subsurface viscosity that is at least one thousand times greater than that of pure water ice. We conclude that Ceres's shallow subsurface is no more than 30% to 40% ice by volume, with a mixture of rock, salts and/or clathrates accounting for the other 60% to 70%. However, several anomalously shallow craters are consistent with limited viscous relaxation and may indicate spatial variations in subsurface ice content. © 2016 Macmillan Publishers Limited.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105985
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: Geological Survey, Astrogeology Science Center, Flagsta, AZ, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Lunar and Planetary Institute, Houston, TX, United States; Columbia University, New York, NY, United States; Institute of Geological Sciences, Freie Universität Berlin, Berlin, Germany; Institut für Planetologie, Westfälische Wilhelms-Universität, Münster, Germany; German Aerospace Center, Berlin, Germany; Southwest Research Institute, Boulder, CO, United States; Virginia Institute of Technology, Blacksburg, VI, United States; Department of Earth and Space Sciences, University of California, Los Angeles, CA, United States

Recommended Citation:
Bland M.T.,Raymond C.A.,Schenk P.M.,et al. Composition and structure of the shallow subsurface of Ceres revealed by crater morphology[J]. Nature Geoscience,2016-01-01,9(7)
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