Origin of parquet-type structures on Venus and problems of its tectonics

Calculations of the temperature profile for the upper shells of Venus suggest that the thickness of the fragile upper layer of the Venusian crust ranges between 10 and 30 km. Below this is the zone of solid-plastic flow of rocks. Consequently, specific structural patterns are generated on Venus which are clearly different from structures on the present-day earth. These patterns may be similar to Early Precambrian structures on the earth characterized by extensive solid-plastic flow. Possible terrestrial analogs of Venusian parquet structures are considered.