Abstract
Simple parameterized models, either whole mantle convection or layered mantle convection, cannot explain the tectonic characteristics of the Earth’s evolution history, therefore a mixed mantle convection model has been carried out in this paper. We introduce a time-dependent parameter F, which denotes the ratio between the mantle material involved in whole mantle convection and the material of the entire mantle, and introduce a local Rayleigh number Ra loc as well as two critical numbers Ra 1 and Ra 2. These parameters are used to describe the stability of the phase boundary between the upper and lower mantle. The result shows that the mixed mantle convection model is able to simulate the episodic tectonic evolution of the Earth.
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