Advanced Plate Tectonics

Heating oce 661 so where do we stand with convection

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Unformatted text preview: mal symmetry, the temperature anomaly would have to be much greater. This effect is somewhat counter to the effects of internal heating and viscosity variability. heating OCE 661 So where do we stand with convection and plate tectonics. Many things work well: Many 1) Dominance of subduction zones and “slab pull” is Dominance consistent with theory, and rates are approximately correct (see Bercovici et al. 2000). Asymmetry consistent with internal heating. 2) “Ridge push” is consistent with a convective pressure 2) Ridge gradient (not an edge force as originally conceived), and consistent with tensional ridge structure, and weak upwelling. 3) Ocean basin structure and depth profiles fit the thermal 3) Ocean boundary layer model reasonably well. OCE 661 So where do we stand with So convection and plate tectonics. Many things work well: Many 4) Downwelling zones correspond reasonably well with Downwelling mantle heterogeneity in the form of velocity anomalies mantle OCE 661 So where do we stand with convection and plate tectonics. Some things seem to work, and some things don’t work quite so well: well: 1) Convection models do not predict narro...
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