Time Scales and Heterogeneous Structure in Geodynamic Earth Models

摘要: Computer models of mantle convection constrained by the history Cenozoic and Mesozoic plate motions explain some deep-mantle structural heterogeneity imaged seismic tomography, especially those related to subduction. They also reveal a 150-million-year time scale for generating thermal in mantle, comparable record motion reconstructions, so that problem unknown initial conditions can be overcome. The pattern lowermost structure at core-mantle boundary is controlled subduction history, although tomography reveals intense large-scale hot (low-velocity) upwelling features not explicitly predicted models.