DOI: 10.1038/ngeo1828
论文题名: Projectile remnants in central peaks of lunar impact craters
作者: Yue Z. ; Johnson B.C. ; Minton D.A. ; Melosh H.J. ; Di K. ; Hu W. ; Liu Y.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期: 6 起始页码: 435
结束页码: 437
语种: 英语
Scopus关键词: crater
; geochemical method
; lunar crust
; numerical model
; olivine
; spinel
英文摘要: The projectiles responsible for the formation of large impact craters are often assumed to melt or vaporize during the impact, so that only geochemical traces or small fragments remain in the final crater. In high-speed oblique impacts, some projectile material may survive, but this material is scattered far down-range from the impact site. Unusual minerals, such as magnesium-rich spinel and olivine, observed in the central peaks of many lunar craters are therefore attributed to the excavation of layers below the lunar surface. Yet these minerals are abundant in many asteroids, meteorites and chondrules. Here we use a numerical model to simulate the formation of impact craters and to trace the fate of the projectile material. We find that for vertical impact velocities below about 12 km s-1, the projectile may both survive the impact and be swept back into the central peak of the final crater as it collapses, although it would be fragmented and strongly deformed. We conclude that some unusual minerals observed in the central peaks of many lunar impact craters could be exogenic in origin and may not be indigenous to the Moon. © 2013 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106788
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: State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing Applications, Chinese Academy Sciences, Beijing, Beijing 100101, China; Department of Earth, Atmospheric and Planetary Sciences, Purdue University, West Lafayette, IN 47907, United States; Department of Physics, Purdue University, West Lafayette, IN 47907, United States
Recommended Citation:
Yue Z.,Johnson B.C.,Minton D.A.,et al. Projectile remnants in central peaks of lunar impact craters[J]. Nature Geoscience,2013-01-01,6(6)