Venusian channels and valleys - Distribution and volcanological implications

Details Venusian channels and valleys - Distribution and volcanological implications Venusian channels and valleys - Distribution and volcanological implications

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993icar..102....1k&link_type=abstract

Icarus (ISSN 0019-1035), vol. 102, no. 1, p. 1-25.

Physics

43

Canals, Magellan Spacecraft (Nasa), Planetary Geology, Valleys, Venus Surface, Volcanology, Crustal Fractures, Erosion, Lava, Plains, Radar Imagery, Venus, Channels, Valleys, Distribution, Volcanism, Surface, Features, Concentration, Morphology, Terrain, Sinuous Rilles, Origin, Formation, Eruptions, Erosion, Highlands, Lava, Canali, Position (Location), Rifts, Fractures, Coronae, Deposits, Flow, Thermal Effects, Sapping, Plains, Rheology, Viscosity

Scientific paper

An updated map is presented which shows the distribution of more than 200 channels and valleys on Venus. A large number of channels are concentrated in equatorial regions characterized by highlands, rift and fracture zones, an associated volcanic features. Many channels associated with flow deposits are similar to typical terrestrial lava drainage channels. They are associated with a wide range of volcanic edifices. More than half of the sinuous rilles are associated with coronae, coronalike features, or arachnoids. Corona volcanism driven by mantle plume events may explain this association. Many valley network are observed in highlands and in association with coronae, coronalike features, or arachnoids. This indicates that highlands and coronae provided fractures and flow-viscosity lavas, both of which seem to be required for network formation by lava sapping processes. Canali-type channels have a unique distribution limited to some plains regions.

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