Crustal spreading on Venus: evidence from topography, morphology, symmetry, and map patterns.

Details Crustal spreading on Venus: evidence from topography, morphology, symmetry, and map patterns. Crustal spreading on Venus: evidence from topography, morphology, symmetry, and map patterns.

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990tectp.182..301c&link_type=abstract

Tectonophysics, Vol. 182, No. 3/4, p. 301 - 331

Physics

1

Venus: Topography, Venus Surface: Structure

Scientific paper

Linear discontinuities cutting across the strike of Western Aphrodite Terra, Venus (Cross-Strike Discontinuities or CSDs) were examined in detail. It was found that: (1) They represent the most prominent regional structural trend in Western Aphrodite and are readily distinguishable from linear patterns caused by ground tracks in the Pioneer-Venus orbiter data. (2) Individual CSDs are either deep troughs or steep regional scarps and steps. (3) The spacing between the more prominent CSDs ranges from about 500 to 1500 km. (4) There is a distinctive structural trend orthogonal to the strike of the CSDs. The detailed characteristics of the CSDs are all very similar to the characteristics of transform faults and fracture zones on the Earth's seafloor. Topography and geometric features such as ridge crests and transforms have specific predictable relationships in a crustal spreading environment. Tests were made and the analyses of cross-strike discontinuities, topographic and image symmetry across Aphrodite, and predictions of topography based on ridge crest and fracture zone geometric relationships further support the earlier interpretation that the 7500 km extent of Western Aphrodite Terra represents the site of crustal spreading and displays many of the characteristics of terrestrial divergent plate boundaries.

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