Effect of a low viscosity layer on long-wavelength topography, upper mantle case

Details Effect of a low viscosity layer on long-wavelength topography, upper mantle case Effect of a low viscosity layer on long-wavelength topography, upper mantle case

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16..625d&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 16, July 1989, p. 625-628.

Physics

3

Earth Mantle, Topography, Viscosity, Heat Flux, Mathematical Models, Steady State

Scientific paper

Numerical models of uppermantle convection incorporating both plates and a substantial low viscosity layer show that long-wavelength topography is only moderately reduced compared with a model without the low viscosity layer. In particular, topography due to hot upwelling from a putative hot boundary layer at 670 km depth is still large. In the case of a migrating spreading center, the symmetry and square-root-of-age dependence of seafloor topography would be destroyed. These results strengthen the case against mantle models in which heat transport across the 670 km seismic discontinuity is predominantly by conduction. A substantial mass flux through 670 km is implied.

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