The global distribution of giant radiating dike swarms on Venus: Implications for the global stress state

Details The global distribution of giant radiating dike swarms on Venus: Implications for the global stress state The global distribution of giant radiating dike swarms on Venus: Implications for the global stress state

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21..701g&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 8, p. 701-704

Mathematics

Logic

56

Geological Faults, Geomorphology, Planetary Geology, Planetary Mapping, Radar Maps, Stress Analysis, Venus (Planet), Magellan Project (Nasa), Radar Data, Radial Distribution, Structural Properties (Geology), Venus, Dikes, Distribution, Stress, Lineaments, Emplacement, Uplift, Origin, Formation, Compensation, Topography, Mantle, Lithosphere, Flow, Rifting, Volcanism, Analysis, Morphology, Comparison, Surface, Features, Aphrodite Terra Region, Atla Regio Region, Themis Regio Region, Compression, Coupling

Scientific paper

Magellan radar data of Venus reveal 163 large radial lineament systems composed of graben, fissure, and fracture elements. On the basis of their structure, plan view geometry, and volcanic associations, at least 72% are interpreted to have formed primarily through subsurface dike swarm emplacement, the remainder through uplift or a combination of these two mechanisms. The population of swarms is used to determine regional and global stress orientation. The stress configuration recorded from 330-210 deg E (Aphrodite Terra) is best explained by isostatic compensation of existing long wavelength topography or coupling between mantle flow and the lithosphere. The rest are correlated with concentrations of rifting and volcanism in the Beta-Atla-Themis region. The global stress field on Venus is different than that of Earth, where plate boundary forces dominate.

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