Mantle plumes with temperature-dependent viscosity - Implications for interpretation of gravity anomalies on Venus

Details Mantle plumes with temperature-dependent viscosity - Implications for interpretation of gravity anomalies on Venus Mantle plumes with temperature-dependent viscosity - Implications for interpretation of gravity anomalies on Venus

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..723k&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 723.

Physics

Plumes, Temperature Dependence, Viscosity, Gravity Anomalies, Venus (Planet), Convection, Rayleigh Number, Boundary Layers

Scientific paper

In recent years, two very different views about the nature and style of mantle convection on Venus have developed. In one view, convection on Venus is vigorous, with a high Rayleigh number and earth-like heat flow. In this model, structures such as Beta, Atla, and Eistla Regiones are the surface expression of upwelling mantle plumes. Alternatively, a rather thick lithosphere and low heat flow have been suggested. Interpretation of Magellan short-wavelength gravity anomaly observations over shield volcanos in terms of elastic flexural support also contributed to the thick lithosphere view, although estimates of elastic thickness have tended to decline as the resolution of the gravity field has improved. An alternative interpretation of these short-wavelength gravity anomalies is that they are also the result of vigorous mantle convection. High Rayleigh number plumes have narrow thermal upwellings and numerical simulations have shown that such plumes may have large amplitude short-wavelength gravity anomalies. If this style of convection occurs on Venus, there may be no need to invoke a thick lithosphere to explain the short-wavelength gravity anomalies.

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