Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..419g&link_type=abstract
Lunar and Planetary Science, volume 27, page 419
Astronomy and Astrophysics
Astrophysics
2
Craters, Deformation, Highlands, Tesserae, Venus
Scientific paper
The Venus cratering record has been shown to have a distribution that is indistinguishable from one that is spatially random, leading to the interpretation that the planet underwent a catastrophic resurfacing event 300 (+300/-110) Ma ago. Although >80% of the surface is composed of volcanic plains, this average age applies to all terrains, including the highly deformed tessera terrain which has been shown in the vast majority of cases to be stratigraphically older than the plains. Using high resolution Magellan data, we have compiled an independent list of tessera craters on Venus, extending to smaller crater sizes the work done by Ivanov and Basilevsky. We then examined each of the deformed craters to determine whether the deformation is attributable to processes of tessera formation or processes that postdated tessera formation. These analyses have resulted in a list of craters that suffered tessera deformation prior to the emplacement of the global plains. The number density of these craters may then be used to constrain the duration over which tessera deformation occurred.
Basilevsky Alexander T.
Gilmore Martha S.
Head James W. III
Ivanov Mikhail I.
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