Other
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..243s&link_type=abstract
European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a
Other
Scientific paper
ABSTRACT A global resurfacing event is supposed to have taken place on Venus (1; 2). Today, however,Venus is a one-plate planet, i.e. the complete surface is covered by one immobile plate. Such a behaviour is also observed in numerical mantle convection models with variable viscosity. Moresi and Solomatov (3) presented a 2D study of mantle convection with a strong temperature dependence and an additional stress dependence of the viscosity. While the strong temperature dependence causes a cold, rigid and immobile surface atop the convective cycle in the planet's mantle, the additional stress dependence leads to deformation zones in the so-called stagnant lid. By using a 3D study Trompert and Hansen (4) also showed that in this way pieces of the surface are mobilised and take part in the convective cycle. The amount of surface subducted and the temporal evolution of the system depend on the strength of the stress dependence. With increasing stress dependence the surface is more strongly weakened (5) and subduction events occur more rapidly (6). Thus we find that for a low stress dependence sporadic subduction events of the complete surface interrupt otherwise stagnant lid convection. The effect of the subduction of cold, rigid material on both the plume motion and the surface topography is investigated.
Hansen Ulrich
Stein Cliff
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