10.1029-2018JE005826Figure211460006.pptx

(a) The ejected material provenance for the giant impact event (780-km diameter impactor with velocity of 6.4 km/s). The crustal thickness was assumed to be 40 km. The excavation cavity is the orange zone. The radius of the excavation cavity is the radial distance along the surface from the impact site to the boundary of excavation cavity. The dashed circle represents the size of impactor. (b) The boundary of transient (solid line) and final crater (black dashed line) for the giant impact event from this work; the transient crater with a radius of 850 km for the proposed Procellarum basin is also plotted as the red dashed circle for the comparison (Wilhelms, 1987). Data are presented in Mollweide equal-area projection centered at 90°W longitude, with nearside on the right of center and farside on the left of center. The background is the topographic distribution observed by Lunar Orbiter Laser Altimeter (Smith et al., 2010). The star on the nearside represents the assumed impact site.