Mathematics – Logic
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990rpsct...3...33n&link_type=abstract
In its JPRS Report: Science and Technology. USSR: Space p 33 (SEE N91-20154 12-12) Transl. into ENGLISH from Geotektonika (Mosco
Mathematics
Logic
Magma, Planetary Evolution, Plates (Tectonics), Venus Surface, Volcanology, Greenhouse Effect, Igneous Rocks, Lithosphere, Planetary Geology, Plastic Plates, Tectonics, Venus (Planet)
Scientific paper
Five stages in the evolution of Venus are discussed: accretion, segregation of early crust from magma ocean; volcanic reworking of early crust, development of tectonics of soft plastic plates with formation of tesserae in compression zones and plains in dilatation zones; formation of weakened planetary zones of dilatation saturated by mantel hot-spot structures against a backdrop of dispersed mantel hot-spot tectonics and plateau volcanism. The following subjects are discussed: types of structures and structural regions of Venus; tectonic structure of Venus and its interpretation; thickness and composition of Venusian crust; model of geological evolution of Venus; asymmetry of tectonic structure of Venus; and reasons for the great differences in the tectonics of the Earth and Venus. The tectonics of Venus differ from those of the Earth because Venus was always impoverished in terms of water, a highly important agent of magmatism and the main fluid involved in the fusion fo sialic rocks. Venusian volcanism therefore was less intense and a sialic crust is largely absent. The greenhouse effect on Venus causes increased plasticity of its lithosphere.
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