Tests of crustal divergence models for Aphrodite Terra, Venus

Details Tests of crustal divergence models for Aphrodite Terra, Venus Tests of crustal divergence models for Aphrodite Terra, Venus

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9412103g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Sept. 10, 1989, p. 12103-12131.

Physics

26

Crustal Fractures, Planetary Mantles, Plates (Tectonics), Venus Surface, Volcanoes, Magellan Project (Nasa), Radar Imagery, Shear Strain, Thermal Boundary Layer, Venus, Aphrodite Terra, Crust, Models, Highlands, Surface, Features, Kinematics, Mantle, Convection, Tectonics, Deformation, Lineaments, Hypotheses, Topography, Morphology, Maps, Diagrams, Plate Tectonics, Comparisons, Analogs, Symmetry, Flow, Lithosphere

Scientific paper

This paper discusses the characteristics of Aphrodite Terra, the highland region of Venus which is considered to be a likely site of mantle upwelling, active volcanism, and extensional tectonics, and examines the relation of these features to three alternative kinematic models for the interaction of mantle convection with the surface. These the 'vertical tectonics' model, in which little horizontal surface displacement results from mantle flow; the 'plate divergence' model, in which shear strain from large horizontal displacements is accommodated only in narrow zones of deformation; and the 'distributed deformation' model, in which strain from large horizontal motions is broadly accommodated. No convincing observational evidence was found to support the rigid-plate divergence, while the evidence of large-scale horizontal motions of Aphrodite argues against purely vertical tectonics. A model is proposed, involving a broad disruption of a thin lithosphere. In such a model, lineaments are considered to be surface manifestations of mantle convective flow.

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