行星科学研究中心
 Home  People  Data & PDS Service  Teaching Courses  Laboratories & Facilities  Press Center  About Us  中文 
 
About Us
 
  Academic progress
Position: English1 > About Us > Academic progress > Content
 
The subsurface structure and stratigraphy of the Chang'E-4 landing site: Orbital evidence from small craters on the Von Ka rman craterfloor
2019-10-11 14:22:41 Xiaohui Fu    (点击次数:)

Chang'E-4 (CE-4) successfully landed on the floor of Von Karman crater within the South Pole-Aitken basin (SPA).One of its scientific objectives is to determine the subsurface structure and thickness of lunar regolith at the landing site and along the traverse route of the Yutu-2 rover. Using orbital data, we employed small craters (diameters<1 km) on the floor of Von Karman crater as probes to investigate the subsurface structure and stratigraphy of the CE-4 landing site. In this study, 40 dark-haloed craters that penetrate through the surface Finsen ejecta and excavate underlying mare deposits were identified, and 77 bright ray craters that expose only the underlying fresh materials but do not penetrate through the surface Finsen ejecta were found. The excavation depths of these craters and their distances from the Finsen crater center were calculated, and the thickness distribution of Finsen ejecta on the Von Karman floor was systematically investigated. The boundary between Finsen ejecta and underlying mare basalt at the CE-4 landing site is constrained to a depth of 18 m. We proposed the stratigraphy for the CE-4 site and interpreted the origins of different layers and the geologic history of Von Karman crater. These results provide valuable geological background for interpreting data from the Lunar Penetrating Radar (LPR) and Visible and Near-infrared Imaging Spectrometer (VNIS) on the Yutu-2 rover. The CE-4 landing site could provide a reference point for crater ejecta distribution and mixing with local materials to test and improve the ejecta thickness models according to the in situ measurements of the CE-4 LPR.

BE3F

http://www.raa-journal.org/docs/papers_accepted/2019-0044.pdf

关闭窗口