Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978dubr.iafcq....k&link_type=abstract
International Astronautical Federation, International Astronautical Congress, 29th, Dubrovnik, Yugoslavia, Oct. 1-8, 1978, 9 p.
Astronomy and Astrophysics
Astronomy
Density Distribution, Mars Surface, Planetary Craters, Planetology, Antisymmetry, Planetary Surfaces
Scientific paper
Crater-density diagrams obtained for Mars on the basis of Mariner 9 and Viking imagery are examined which pertain to highly cratered areas, plains, channels, labyrinths, and volcanic areas. It is suggested that the oldest Martian volcanoes are the same age as the highly cratered areas (4 eons) and that the youngest volcanoes are the same age as the plains and channels. Asymmetries and antisymmetries between the two Martian hemispheres corresponding to highly and slightly cratered areas are discussed, including differences in average elevations, evidence of fluvial erosion in the northern hemisphere and aeolian erosion in the southern, and the antisymmetric distribution of the two great volcanic plateaus and the two largest impact structures. It is concluded that Martian volcanism began after the great impacts had already broken the crust, that both volcanism and strong erosion ended about 1 eon ago, and that a dense primordial atmosphere existed on Mars, disappeared quickly, and was probably replaced by outgassing from the interior via volcanism.
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