气候变化领域集成服务门户(CCPortal): Rock abundance and evolution of the shallow stratum on Chang'e-4 landing site unveiled by lunar penetrating radar data

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DOI	10.1016/j.epsl.2021.116912
	Rock abundance and evolution of the shallow stratum on Chang'e-4 landing site unveiled by lunar penetrating radar data
	Zhang L.; Xu Y.; Bugiolacchi R.; Hu B.; Liu C.; Lai J.; Zeng Z.; Huo Z.
发表日期	2021
ISSN	0012821X
卷号	564
英文摘要	The Yutu-2 rover, part of the Chang'e-4 (CE-4) mission to the lunar farside, has been exploring the Von Kármán crater (VK) within the South Pole-Aitken (SPA) gathering data on its geology. The Lunar Penetrating Radar's (LPR) 500 MHz antenna reveals the subsurface structure up to 40 m in depth, which helps to construct models on the evolution of the shallow stratum. This work presents the analysis and interpretation of the data collected during the first twenty lunar days, from January 2019 to July 2020. Below an 11±4-meter surface regolith layer, the radar image reveals well-defined reflectors that are interpreted as discrete depositional layers. These marked density boundaries could indicate a geologically brief time interval between each arrival, which prevented the materials to undergo a deeper homogenization through space weathering. To investigate further, we generated a subsurface rock distribution map using the correlation of dual-channel antennas data from the same channel. Clusters of rocks located at the bottom of each ejecta stratum are revealed, probably sorted by size due to the statistically less frequent occurrence of larger impact events admixing the deeper-seated materials. The bowl-shaped outline discovered in both rock and LPR energy distribution maps is interpreted to represent a 150±30 m wide and 10±5 m deep paleo-crater that was excavated within three thin ejecta layers. The CE-4 LPR reveals a complex geological history within the Von Kármán crater with no fewer than four impact events delivering meters thick ejecta at the CE-4 landing area following the end of the infilling phase. © 2021 Elsevier B.V.
关键词	Chang'e-4 mission ejecta lunar penetrating radar regolith shallow stratigraphic structure Von Kármán crater
英文关键词	Geological surveys; Ground penetrating radar systems; Radar antennas; Radar imaging; Rocks; Weathering; Chang'e-4 mission; Distribution maps; Ejectum; Lunar penetrating radar; Penetrating radar; Regolith; Shallow stratigraphic structure; Shallow stratums; Von Karman; Von karman crater; Stratigraphy; Chang'e; crater; ejecta; Moon; radar; regolith; stratigraphy
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/203371
作者单位	State Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology, Macau, China; College of Geo-exploration Science and Technology, Jilin University, Changchun, 130026, China; Earth Sciences, University College London, London, United Kingdom; School of Science, Jiangxi University of Science and Technology, Ganzhou, China
推荐引用方式 GB/T 7714	Zhang L.,Xu Y.,Bugiolacchi R.,et al. Rock abundance and evolution of the shallow stratum on Chang'e-4 landing site unveiled by lunar penetrating radar data[J],2021,564.
APA	Zhang L..,Xu Y..,Bugiolacchi R..,Hu B..,Liu C..,...&Huo Z..(2021).Rock abundance and evolution of the shallow stratum on Chang'e-4 landing site unveiled by lunar penetrating radar data.Earth and Planetary Science Letters,564.
MLA	Zhang L.,et al."Rock abundance and evolution of the shallow stratum on Chang'e-4 landing site unveiled by lunar penetrating radar data".Earth and Planetary Science Letters 564(2021).