Other
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.p71b0468v&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #P71B-0468
Other
1236 Rheology Of The Lithosphere And Mantle (8160), 3210 Modeling, 6295 Venus, 8121 Dynamics, Convection Currents And Mantle Plumes, 8147 Planetary Interiors (5430, 5724)
Scientific paper
Recent evidence suggests that the Beta Regio equatorial highland, generally considered to be a plume-related structure, was emplaced over a relatively short period of time in the recent Venus history (100 - 400 m.y.). Numerical simulations which use this evidence as a new constraint on geodynamic models show that it is difficult to satisfy simultaneously the constraint on the uplift rate and the constraints on gravity, topography and rheology. One possible solution is that the effective viscosity contrast between the mantle and the lithosphere does not exceed about 104. If our simple models do capture the basic dynamics of formation of Beta Regio, this value implies that the viscosity of the lithosphere is softer than olivine at subsolidus temperatures and that the Venusian lithosphere may not be much stronger than the terrestrial one. We investigate another possible interpretation of these results - the effect of small-scale convection which can be developed in the plume or in some other type of upwelling. This can significantly accelerate the uplift rates of Beta Regio and satisfy the timing constraints.
Basilevsky Alexander T.
Baumgardner John R.
Head James W.
Moresi L.-N.
Solomatov Viatcheslav S.
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