Mantle convection and magma production on present-day Mars: Effects of temperature-dependent rheology

Details Mantle convection and magma production on present-day Mars: Effects of temperature-dependent rheology Mantle convection and magma production on present-day Mars: Effects of temperature-dependent rheology

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3416203l&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 16, CiteID L16203

Physics

18

Planetary Sciences: Solid Surface Planets: Heat Flow, Planetary Sciences: Solid Surface Planets: Interiors (8147), Planetary Sciences: Solid Surface Planets: Volcanism (6063, 8148, 8450), Planetary Sciences: Solar System Objects: Mars, Tectonophysics: Dynamics: Convection Currents, And Mantle Plumes

Scientific paper

Using recent volcanism on Mars as an important constraint, we explore the nature of present-day mantle convection using numerical simulations with temperature-dependent Arrhenius viscosity. Increasing the activation energy decreases both the magma production rate and the convective heat flux, while increasing the thermal Rayleigh number increases these quantities. For values of the activation energy inferred from lab studies of olivine, a thermal Rayleigh number (defined with a volume-averaged viscosity) exceeding 2 . 106 best fits the observational constraints, including the recent volcanism rate and the range of melt fractions in the shergottites. The heat flux out of the core is low enough to avoid a magnetic dynamo, an important improvement over prior work. These results indicate that present-day mantle convection on Mars remains relatively vigorous.

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