Principal types of structures in Venusian northern hemisphere

Details Principal types of structures in Venusian northern hemisphere Principal types of structures in Venusian northern hemisphere

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986rpspr...1..122b&link_type=abstract

In its USSR Report: Space (JPRS-USP-86-001) p 122-123 (SEE N86-20178 10-88) Transl. into ENGLISH from Astronomicheskiy Vestni

Mathematics

Logic

Mapping, Venus (Planet), Venus Atmosphere, Venus Surface, Erosion, Geological Faults, Planetary Craters, Planetary Evolution, Tectonics, Volcanoes, Water

Scientific paper

Mapping of the Venusian Northern Hemisphere has made it possible to draw a whole series of important conclusions concerning the planet. There is no evidence of activity of liquid water. If a hydrosphere ever existed, it disappeared much more than a billion years ago. At the survey scale it is impossible to detect evidence of eolian erosion or redeposition. If the planet ever rotated more rapidly and stronger winds prevailed, this much have been over a billion years ago. Due to the weakness of exogenous reworking, in the Venusian relief there is a clear expression of deep dislocations corresponding in age to the Proterozoic complex on the Earth (on the Earth only observed t considerable depths). Tectonic dislocations of three types predominate on Venus: concentric annular voids, zones of linear folded-faulted dislocations and parquette dislocations. The latter constitute a phenomenon caused by a high temperature at the planetary surface, as a result of which large plates of the thin crust move along a plastic substrate or are entrained by it and are rumpled, hummocked and dilatated. Venus is not a single-plate planet, like the Moon or Mercury; its crust is distinctly broken into individual blocks with independent movements. It appears that extensive basaltic volcanism is a universal factor in evolution of planets of the Earth type. The rarity of impact craters in the ancient relief indicates that they disappear rather rapidly due to a number of possible mechanisms.

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