Mean age of rifting and volcanism on Venus deduced from impact crater densities

Details Mean age of rifting and volcanism on Venus deduced from impact crater densities Mean age of rifting and volcanism on Venus deduced from impact crater densities

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994natur.372..756p&link_type=abstract

Nature, Volume 372, Issue 6508, pp. 756-759 (1994).

Physics

68

Scientific paper

UNLIKE the extensively cratered highlands of the Moon and Mars, the surface of Venus does not preserve a record of heavy bombard-ment from the early history of the Solar System1-3. Those craters that are found on Venus appear to be statistically indistinguishable from a random spatial population and rarely show modification by folds, faults and lava flows1-3. Although the volcanic and tec-tonic history of Venus is still much debated2-5, there is mounting evidence for near-global resurfacing ˜300-500 Myr ago1,2,6. Moreover, it has recently been noted that the density of impact craters on large volcanic structures is less than the average crater density of the planet, suggestive of significant activity after the resurfacing event7. It is not clear, however, whether these features represent late remnants of the global event or continuing volcanism and tectonism of a still active planet. To address this question, we have used the regional variations in crater density to date volcan-oes, rifts and coronae which, based on stratigraphic evidence, clearly post-date the main resurfacing event8-11. The calculated mean ages of 70-125 Myr exclude the possibility that the majority of these features represent the final stages of the global event.

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