Physics
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18..471r&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 18, March 1991, p. 471-474.
Physics
1
Hypervelocity Impact, Planetary Craters, Planetary Mantles, Venus Surface, Impact Melts, Mathematical Models, Radio Altimeters, Surface Temperature
Scientific paper
Empirical flow laws for peridotite and diabase were used to model the viscous relaxation of large impact craters on Venus. The models were then compared to the depth of the three largest impact craters (not less than 60 km diameter) measured by Venera 15/16 radar altimetry. The maximum crater retention times predicted by models that assumed not less than 0.03 pct wt water in the upper mantle were inconsistent with the observed depth of these craters and a mean minimum age of 0.5 Ga. Models that assumed an upper mantle water content of not greater than 0.003 pct wt were consistent with the observations and a maximum crater retention time of 1.0 Ga. This result was insensitive to up to 60 percent by volume diabase mixed into the upper mantle as inclusions at the several kilometer scale and the presence of a basalt-eclogite or melting transition at a depth of 100 km.
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