On the nature and rate of resurfacing of Venus

Details On the nature and rate of resurfacing of Venus On the nature and rate of resurfacing of Venus

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.1385a&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 17, Aug. 1990, p. 1385-1388.

Other

14

Erosion, Planetary Craters, Tectonics, Topography, Venus Surface, Altimetry, Astronomical Models, Magellan Project (Nasa), Radar Imagery, Volcanoes

Scientific paper

Crrater production and obliteration are modeled for the plains of Venus, using (1) the observed distribution of Venus-crossing asteroids and comets; (2) viscous relaxation of crater topography; and (3) erosion and burial by atmospheric, volcanic, and tectonic processes. Crater lifetimes are assumed to be proportional to crater depths for both classes of obliterative processes although the individual criteria vary. An average crater retention age between 0.4 to 2.0 Gyr is estimated for plains, under the assumption that craters are produced and not removed. The range is driven by uncertainty in identifying degraded impact as opposed to volcanic craters. On the other hand, crater retention ages greater than about 1.6 Gyr are unlikely if viscous relaxation operates without loading of crater floor by burial. The preferred model has plains subject to crater production and obliteration processes that vary over both space and time.

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