Deformational models of rifting and folding on Venus

Details Deformational models of rifting and folding on Venus Deformational models of rifting and folding on Venus

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.4759b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, May 10, 1988, p. 4759-4772. NASA-supported research.

Mathematics

Logic

54

Folds (Geology), Geological Faults, Plates (Tectonics), Venus Surface, Elastic Deformation, Lithosphere, Planetary Mantles, Venus, Deformation, Models, Rifting, Folding, Surface, Features, Tectonics, Structure, Lithosphere, Geophysics, Theroretical Studies, Compression, Extension, Elasticity, Parameters, Rheology, Mantle, Crust, Friction, Depth, Thermal Effects, Rifts, Formation, Origin, Thickness, Maps, Calculations, Diagrams, Stress

Scientific paper

Features of presumed tectonic origin on Venus are reviewed, and lithospheric strength envelopes are derived based on laboratory measurements of the deformational properties of crustal and subcrustal rocks, extrapolated to conditions appropriate to Venus. Models for rifting and folding are developed that use this lithospheric structure and take into account both brittle and ductile yielding as well as finite elastic strength. For both rifting and folding, structures with characteristic widths and spacings are predicted whose size depends on the thickness of the lithosphere, density contrast, and elastic properties of the layer. Finally, the model predictions are compared with the widths and spacings of observed tectonic features, and it is concluded that they are consistent with a relatively strong mantle layer separated from a thin brittle surface layer by a ductile lower crust. These results allow constraints to be placed on the crustal thickness and thermal gradient on Venus.

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