Header
Accueil du site > Publications > Geological characteristics of Von Kármán Crater, Northwestern South (...)

Geological characteristics of Von Kármán Crater, Northwestern South Pole‐Aitken Basin : Chang’E‐4 landing site region

Huang, J. ; Xiao, Z. ; Flahaut, J. ; Martinot, M. ; Head, J. ; Xiao, X. ; Xie, M. ; Xiao, L., J. Geophy. Res. Planets

Geological characteristics of Von Kármán Crater, Northwestern South Pole‐Aitken Basin : Chang’E‐4 landing site region

Huang, J. ; Xiao, Z. ; Flahaut, J. ; Martinot, M. ; Head, J. ; Xiao, X. ; Xie, M. ; Xiao, L.

Journal of Geophysical Research Planets, 2018,

Abstract :

Von Kármán crater (diameter = 186 km), lying in the northwestern South Pole‐Aitken basin, was formed in the pre‐Nectarian. The Von Kármán crater floor was subsequently flooded with one or several generations of mare basalts during the Imbrian period. Numerous subsequent impact craters in the surrounding region delivered ejecta to the floor, together forming a rich sample of the SPA basin and farside geologic history. We studied in detail the targeted landing region (45.0–46.0°S, 176.4–178.8°E) of the 2018 Chinese lunar mission Chang’E‐4, within the Von Kármán crater. The topography of the landing region is generally flat at a baseline of 60 m. Secondary craters and ejecta materials have covered most of the mare unit, and can be traced back to at least four source craters (Finsen, Von Kármán L, Von Kármán L’ and Antoniadi) based on preferential spatial orientations and crosscutting relationships. Extensive sinuous ridges and troughs are identified spatially related to Ba Jie crater (diameter = 4 km). Reflectance spectral variations due to difference in both composition and physical properties are observed among the ejecta from various‐sized craters on the mare unit. The composition trends were used together with crater scaling relationships and estimates of regolith thickness to reconstruct the subsurface stratigraphy. The results reveal a complex geological history of the landing region, and set the framework for the in‐situ measurements of the CE‐4 mission, which will provide unique insights into the compositions of farside mare basalt, SPA compositional zone, including SPA compositional anomaly and Mg‐pyroxene annulus, regolith evolution and the lunar space environment.

Voir en ligne : https://doi.org/10.1029/2018JE005577




publié mardi 29 mai 2018