Numerical Study Of The Crust-Mantle Interactional Dynamics

Widely reading the papers with respect to layers coupling throughout the world, we found that mantle convection is an effective way to transport quantity of heat and transform it into the kinetic energy of plate motion, and the plate motion influences the configuration of mantle convection in a certain extent. The study of the crust-mantle coupling dynamics may take further significance to ascertain the global tectonics.For the global numerical study of the crust-mantle coupling dynamics, the main contributions of my thesis are as follows. (1) Setting up a mantle convection model with Non-Newtonian fluid character. A Non-Newtonian fluid model keeps the temperature affection of the variable viscosity model and imports the fluid pressure affection to the fluid viscosity at the same time. (2) Setting up a global crust-mantle finite element model without zoom. An actual dimension model without zoom avoids the uncertainty imported by zoom in scale minimally, and computation in global scale can analyze the earth dynamics in large scale preferably. (3) Setting up a finite element plate model partitioned with the geographical location. The corresponding of the position in finite element model and the geographical location shows the stimulant phenomenon in geoscience visually. (4) Analyzing the relationships of crust-mantle coupling dynamics and global tectonics. This thesis analyzes the kinetic reason of global tectonics about the mantle part, the crust part and the mohorovicic discontinuity, and shows some computational results of them.The more observations should be used to constrain the model in the future, and then the differences between the results of analyzing and forecasting and the datum of actual observations are used to regulate the model following the actual physics of the earth, so that the coupling dynamics of the global tectonics will be found step by step.