Physics
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990em%26p...50..175g&link_type=abstract
Earth, Moon, and Planets (ISSN 0167-9295), vol. 50-51, July-Dec. 1990, p. 175-190.
Physics
12
Grain Size, Planetary Craters, Radar Imagery, Sediments, Synthetic Aperture Radar, Venus Surface, High Resolution, Meteorite Craters, Venera Satellites
Scientific paper
The sedimentary cycle of Venus is examined, with specific attention to the contribution from impact events. The observed record of impact craters on the surface of Venus can be used to calculate the contribution of fine materials generated by impact processes to the global sedimentary cycle. Ejecta volume calculations carried out on the basis of various crater population scenarios suggest that the maximum global ejecta layer thickness over the past 1 Gyr is about 1-2 mm. This would translate to a global accumulation rate of only 0.002 to 0.01 micron per year. Moreover, most of this material could never have been available for global transport; it is projected that over 90 percent of the ejecta would be deposited within 1-3 radii of the crater rim, and only 0.02-0.05 percent could be available as fine dust for global sedimentary cycle. Therefore, the global layer thickness of transportable impact-derived dust can be no more than a few mm over the past 1 Gyr.
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