Tectonics and Evolution of Coronae on Venus: Preliminary Results of Tectonophysical Modeling

摘要: The formation of annular features on Venus, the so-called coronae, is modeled. It common practice to associate their with uplift and relaxation hot mantle diapirs. We managed partially reproduce topography structural pattern initial stage corona evolution, a radially fractured dome, by lifting lowering piston under layer sand consistent oil or moist clay. failed model dense radial fracturing, which typical earliest evolution. were able necessary attribute concentric structures, are commonly assumed be formed at dome relaxation. Their mechanism in our experiments can serve only as partial analog processes that produce rims. There an obvious need use more accurate models. Nevertheless, modeling shows brittle deformations manifest themselves clearly than do plastic ones dome-shaped during generation natural coronae. also deformation within depends some extent relationship between thickness cross-sectional sizes. latter for lithosphere sizes diapir form corona.