Constraints on the thermal evolution of Venus inferred from Magellan data

Details Constraints on the thermal evolution of Venus inferred from Magellan data Constraints on the thermal evolution of Venus inferred from Magellan data

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.5309a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. E3, p. 5309-5315.

Physics

34

Planetary Crusts, Planetary Evolution, Planetary Mantles, Planetary Temperature, Venus (Planet), Magellan Project (Nasa), Planetary Craters, Planetary Geology, Surface Temperature, Venus Surface, Venus, Thermal History, Evolution, Spacecraft Observations, Surface, Magellan Mission, Resurfacing, Model, Lithosphere, Stress, Mantle, Convection, Cooling, Circulation, Interior, Thermal Effects, Crust, Temperature, Comparisons, Craters, Deformation, Hydration, Viscosity, Oscillation, Tectonics

Scientific paper

One interpretation of the Magellan data suggests that the cratering record on Venus was erased by a global resurfacing event, or events, the latest ending about 500 m.y. ago. In this global-resurfacing model the resurfacing was followed by minor volcanism and tectonism that has been concentrated primarily in the equatorial highland regions characterized by extensive fracture belts and rifts. A thermal evolution model of Venus that can explain these observations is one in which a deformable lithosphere, capable of being incorporated in mantle circulations, provides an almost stress-free condition at the surface. Mantle convection with an almost stress-free boundary at the surface cools the interior more efficiently. Rapid cooling decreases the Rayleigh number of mantle convection below a transition value required for oscillatory convection, and the vigor of convection diminishes as the mantle changes to a quasi-steady circulation after about 500 m.y. ago.

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