Physics
Scientific paper
Nov 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977pepi...15..202s&link_type=abstract
(Lunar Science Institute, Conference on Comparisons of Mercury and the Moon, Houston, Tex., Nov. 15-17, 1976.) Physics of the Ea
Physics
16
Craters, Mercury (Planet), Planetary Surfaces, Volcanology, Color Photography, Halos, Lunar Craters, Maria, Mariner 10 Space Probe, Plains, Planetary Composition, Resolution, Spaceborne Photography, Tectonics
Scientific paper
The presence of internally modified impact craters on Mercury's surface may be used to evaluate the possibility of Mercurian volcanism. Such craters are similar to the floor-fractured and mare-filled craters observed on the moon. Mariner-10 images show that most such craters occur, as on the moon, near plains-filled basins. Color-ratio images have indicated that some Mercurian craters manifest red plains materials on their floors. These features may be associated with lava analogous to mare basalts in some lunar craters, or with compositionally distinct subsurface material preserved within the impact crater. Several basins manifest photometric contrasts between basin exteriors and basin-filling plains. Dark haloes are observed around some impact craters superimposed on the interior plains. This suggests the excavation of compositionally distinct material. Some possible endogenic features are discerned, despite the poor surface resolution, such as irregular rimless depressions. It is felt that volcanism may have occurred on Mercury, and that in some areas it may be similar to that of the lunar Mare Australe region.
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