The thermal state of the Venusian mantle

Details The thermal state of the Venusian mantle The thermal state of the Venusian mantle

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991em%26p...55...51a&link_type=abstract

Earth, Moon, and Planets (ISSN 0167-9295), vol. 55, Oct. 1991, p. 51-68.

Physics

1

Planetary Mantles, Planetary Temperature, Thermal Boundary Layer, Venus Surface, Heat Transfer, Lithosphere, Plateaus, Plates (Tectonics), Topography

Scientific paper

Assuming that the surface topography of the Ovda and Thetis plateaus and that of the saddle region between Thetis and Atla plateaus is due to surface subsidence of oceanic-type thermal boundary layers, the temperature is calculated at 200 km beneath the plateaus to be about 1600 C and that beneath the saddle region to be about 1400-1500 C. The total subsidence of Ovda plateau in the last 3/4 of its existence - i.e., between 200 km and 800 km off the postulated ridge axis - suggests that the plateau is probably a young feature, less than 40 Myr old. The spreading plate models imply a half-spreading rate of 2.3-5.3 cm/yr for the plateaus and 2-2.8 cm/yr for the saddle region.

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