Abstract Volcanism and tectonics are responsible for the majority of landforms observed on Venera radar images covering the northern quarter of Venus' surface. Exogenetic resurfacing on Venus has been found negligible. The plains (about 75% of the area) are predominant with numerous features evidencing their formation as a result of basaltic volcanism. Tectonic deformations are mainly concentrated within uplands which occupy about 25% of the area. The most abundant are uplands bearing the crossecting systems of ridges and grooves (“parquet” or tesserae) which indicate deformations due to horizontally oriented stress or strain. Large dome-like uplifts with plains-like morphology complicated by apical systems of subparallel grooves represent another major type of tectonic landforms (Beta Regio etc.). The ridge belts bearing the controversional evidences of their compressional and/or extensional origin and observed on many venusian plains may be specific surficial manifestations of global spreading on Venus. Average crater retention age of the area surveyed is estimated as 0.5 to 1.0 b.y. Tectonic-volcanic resurfacing on Venus during the dated period of its history was an order of magnitude less than at Earth's oceanic floor.
Volcanism and tectonics of venus: Venera results
Advances in Space Research ; 10 , 3-4 ; 125-135
1989-01-01
11 pages
Article (Journal)
Electronic Resource
English
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