Global distribution of lunar impact melt flows

Rembrandt impact basin: Distinguishing between volcanic and impact-produced plains on Mercury

“…Impact melt deposits are found to occur on impact crater rims on Mercury (Hawke and Cintala, 1977), similar to results for the Moon (e.g., Hawke and Head, 1977;Neish et al, 2014). The distance between the PrL deposits and the Rembrandt rim-crest and their location varies azimuthally around the basin (Fig.…”

Geologic mapping of ejecta deposits in Oppia Quadrangle, Asteroid (4) Vesta

“…The general patterns and elongation directions of some of the light mantle deposits in each zone are consistent with the respective transport directions from Oppia crater. The light mantle deposits are also at lower elevations and away from the lower elevation rim on Oppia, consistent with observations that lunar impact melt are commonly directed away from the lower portion of the crater rim (Neish et al, 2014). Light mantle deposits are up to $300 km away from Oppia.…”

“…There is also light mantle present on the interior crater wall. This particular deposit has several characteristics similar to lunar impact melt deposits including the flow-like appearance elongated in a downslope direction, deposition within 2 crater radii away from the rim, and its distribution direction coincides with the lowest part of the crater rim (Bray et al, 2010;Carter et al, 2012;Denevi et al, 2012;Neish et al, 2014;Le Corre et al, 2013). Light mantle deposits along the interior crater walls could represent a thin coating or veener of impact melt as observed on lunar craters (Bray et al, 2010).…”

Geomorphologic mapping of the lunar crater Tycho and its impact melt deposits

“…However, smaller more evenly distributed melt pools are present in the NW to N and the S-SE, which suggests that the overall distribution of melt at Tycho is indicative of an oblique impact, rather than preexisting topography. Neish et al (2014 ) observed that 53% of complex craters exhibit preferred melt emplacement directions coincident with the lowest point in the crater rim to within a few degrees azimuth. They note, however, that Tycho is one of the 13% of complex craters which show the opposite trend.…”

“…The impact angle has great influence on the distribution of the impact melt deposits, with the most extensive melt deposits occurring in the Units (this study) Description Units ( Pohn, 1972 ) inferred downrange direction ( Howard and Wilshire, 1975;Hawke and Head, 1977 ). Another significant influence on impact melt emplacement is the pre-existing topography ( Hawke and Head, 1977;Neish et al, 2014 ). Morris et al (20 0 0) concluded that the large melt pools to the E-NE were affected by the pre-existing Pictet crater and unnamed crater U.…”