Physics
Scientific paper
Sep 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979georl...6..739m&link_type=abstract
Geophysical Research Letters, vol. 6, Sept. 1979, p. 739-741.
Physics
2
Planetology, Tectonics, Venus (Planet), Volcanology, Argon Isotopes, Earth (Planet), Lithosphere, Mars (Planet), Planetary Mantles, Venus, Tectonics, Craters, Lithosphere, Crust, Volatile Elements, Mantle, Water, Geochemistry, Petrology, Argon, Potassium, Comparisons, Viscosity, Volcanism, Erosion, Deposition, Composition, Thermal Gradients, Outgassing, Thickness
Scientific paper
The paper reexamines the evidence on the intensity of Venusian tectonic/volcanic activity and suggests alternate hypotheses. Three major questions are discussed: (1) whether the presence of large, presumably primordial craters on Venus requires an intensity of tectonic/volcanic activity significantly less than on earth, (2) what thicknesses of lithosphere are implied for reasonable models of temperature and volatile content of the upper mantle of Venus, and (3) can the recently obtained Ar-40 content of the Venus lower atmosphere help define the relative tectonic/volcanic activities of Venus and earth. It was shown that the abundance of Ar-40 in the Venus atmosphere lies between the earth value and one-tenth of the earth value, and since erosional liberation of Ar-40 on Venus will be inefficient, this range for Ar-40 abundance indicates an active tectonic history. It is concluded that the presence of craters and possible mantle dryness does not restrict Venus tectonics to a Mars-like model, and an earth-like model is equally probable.
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