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Modelling compressible mantle convection with large viscosity contrasts in a three-dimensional spherical shell using the yin-yang grid
Here it is documented how an existing code for modelling mantle convection in a cartesian domain, Stag3D, has been converted to model a 3D spherical shell by using the recently introduced yin-yang
A doubling of the post-perovskite phase boundary and structure of the Earth's lowermost mantle
A pair of seismic discontinuities observed in some regions of D″ can be explained by the same phase transition as the result of a double-crossing of the phase boundary by the geotherm at two different depths.
Self‐consistent generation of tectonic plates in time‐dependent, three‐dimensional mantle convection simulations
[1] Presented here are self-consistent, three-dimensional simulations of mantle convection, some of which display an approximation of plate tectonic behavior that is continuous in space and time.
Self‐consistent generation of tectonic plates in time‐dependent, three‐dimensional mantle convection simulations 2. Strain weakening and asthenosphere
[1] In a previous paper [Tackley, 2000b] it was shown that a combination of temperature-dependent viscosity and viscoplastic yielding is sufficient to give rudimentary plate tectonic-like behavior in
Testing the tracer ratio method for modeling active compositional fields in mantle convection simulations
[1] Tracer methods are attractive for modeling compositional fields because they offer the potential of zero numerical diffusion. Composition is typically taken to be proportional to the absolute
Effects of an endothermic phase transition at 670 km depth in a spherical model of convection in the Earth's mantle
Numerical modelling of mantle convection in a spherical shell with an endothermic phase change at 670 km depth reveals an inherently three-dimensional flow pattern, containing cylindrical plumes and
A comparison of numerical surface topography calculations in geodynamic modelling: an evaluation of the ‘sticky air’ method
SUMMARY Calculating surface topography in geodynamic models is a common numerical problem. Besides other approaches, the so-called ‘sticky air’ approach has gained interest as a free-surface proxy at
Dynamics and evolution of the deep mantle resulting from thermal, chemical, phase and melting effects
Abstract The core–mantle boundary (CMB) – the interface between the silicate mantle and liquid iron alloy outer core – is the most important boundary inside our planet, with processes occurring in
Strong heterogeneity caused by deep mantle layering
[1] Numerical simulations are used to characterize the volumetric heterogeneity associated with proposed chemical layering in the deep mantle. A globally continuous, undulating layer generates
Evolution of U-Pb and Sm-Nd systems in numerical models of mantle convection and plate tectonics
hypotheses are examined to explain this discrepancy. Sampling length scale has a minimal effect on age. The extent of crustal settling above the core-mantle boundary makes some difference but not