globalchange  > 气候减缓与适应
DOI: 10.1002/2017JE005287
Scopus记录号: 2-s2.0-85042219857
论文题名:
Investigation of Charon's Craters With Abrupt Terminus Ejecta, Comparisons With Other Icy Bodies, and Formation Implications
作者: Robbins S.J.; Runyon K.; Singer K.N.; Bray V.J.; Beyer R.A.; Schenk P.; McKinnon W.B.; Grundy W.M.; Nimmo F.; Moore J.M.; Spencer J.R.; White O.L.; Binzel R.P.; Buie M.W.; Buratti B.J.; Cheng A.F.; Linscott I.R.; Reitsema H.J.; Reuter D.C.; Showalter M.R.; Tyler G.L.; Young L.A.; Olkin C.B.; Ennico K.S.; Weaver H.A.; Stern S.A.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期:1
起始页码: 20
结束页码: 36
语种: 英语
英文关键词: Charon ; comparative planetology ; craters ; ejecta ; ice ; New Horizons ; water
Scopus关键词: comparative study ; crater ; ejecta ; formation mechanism ; ice ; Mars ; observational method ; paleontology ; solar system ; terrain
英文摘要: On the moon and other airless bodies, ballistically emplaced ejecta transitions from a thinning, continuous inner deposit to become discontinuous beyond approximately one crater radius from the crater rim and can further break into discrete rays and secondary craters. In contrast, on Mars, ejecta often form continuous, distinct, and sometimes thick deposits that transition to a low ridge or escarpment that may be circular or lobate. The Martian ejecta type has been variously termed pancake, rampart, lobate, or layered, and in this work we refer to it as “abrupt termini” ejecta (ATE). Two main formation mechanisms have been proposed, one requiring interaction of the ejecta with the atmosphere and the other mobilization of near-surface volatiles. ATE morphologies are also unambiguously seen on Ganymede, Europa, Dione, and Tethys, but they are not as common as on Mars. We have identified up to 38 craters on Charon that show signs of ATE, including possible distal ramparts and lobate margins. These ejecta show morphologic and morphometric similarities with other moons in the solar system, which are a subset of the properties observed on Mars. From comparison of these ejecta on Charon and other solar system bodies, we find the strongest support for subsurface volatile mobilization and ejecta fluidization as the main formation mechanism for the ATE, at least on airless, icy worlds. This conclusion comes from the bodies on which they are found, an apparent preference for certain terrains, and the observation that craters with ATE can be near to similarly sized craters that only have gradational ejecta. ©2017. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114760
Appears in Collections:气候减缓与适应

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作者单位: Southwest Research Institute, Boulder, CO, United States; Department of Earth and Planetary Sciences, The Johns Hopkins University, Baltimore, MD, United States; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, United States; Sagan Center, SETI Institute, Mountain View, CA, United States; Planetary Systems Branch, Space Sciences and Astrobiology Division, NASA Ames Research Center, Moffett Field, CA, United States; Lunar and Planetary Institute, Houston, TX, United States; Department of Earth and Planetary Sciences at McDonnell Center for the Space Sciences, Washington University, St. Louis, MO, United States; Lowell Observatory, Flagstaff, AZ, United States; Department of Earth and Planetary Sciences, University of California, Santa Cruz, CA, United States; Massachusetts Institute of Technology, Cambridge, MA, United States; NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Department of Electrical Engineering, Stanford University, Stanford, CA, United States; Ball Aerospace (retired), Boulder, CO, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States

Recommended Citation:
Robbins S.J.,Runyon K.,Singer K.N.,et al. Investigation of Charon's Craters With Abrupt Terminus Ejecta, Comparisons With Other Icy Bodies, and Formation Implications[J]. Journal of Geophysical Research: Planets,2018-01-01,123(1)
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