Physics
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..607j&link_type=abstract
Lunar and Planetary Science, volume 27, page 607
Physics
2
Age, Chasmata, Coronae, Lithosphere, Venus
Scientific paper
Topographic flexural signatures and geoid (or gravity)/topography admittance studies provide constraints on lithospheric properties (such as thickness and strength) on Venus, but are unable to distinguish between spatial and temporal variations in such properties. Relative variations in surface age of sufficiently large areas can be distinguished however, on the basis of impact crater densities. In particular, impact crater densities for large volcanoes, the chasmata regions, and coronae with extensive associated volcanism indicate that these three classes of features are young relative to the mean surface age of the planet. We postulate that differences between coronae associated with chasmata, those on swells (excluding Beta and Atla), those in the plains, and those in corona chains reflect a combination of spatial and temporal variations in lithospheric properties. These variations are investigated using information derived from (a) studies of lithospheric thickness at coronae and chasmata, (b) variations in corona morphology with tectonic regime, (c) impact crater densities, and (d) relaxation of impact crater topography.
Johnson Clifton L.
Solomon Stanley C.
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