Other
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusm.t34a..03g&link_type=abstract
American Geophysical Union, Spring Meeting 2004, abstract #T34A-03
Other
8125 Evolution Of The Earth, 8130 Heat Generation And Transport, 8147 Planetary Interiors (5430, 5724), 8155 Plate Motions: General, 8157 Plate Motions: Past (3040)
Scientific paper
Understanding the feedback between the dynamically coupled systems of mantle convection and plate tectonics is an important geodynamical problem. In particular, how does the time-dependence associated with tectonic plate velocity and morphology affect other time-dependent features such as plume motion and longevity, surface heat flux and core-mantle boundary heat flux? Previous authors have specified plate-like behaviour in mantle convection models with evolving plate velocities but static plate geometries over time periods approximating billions of years. These studies have led to a greater understanding of the role of plates on mantle convection including flow patterns, mantle temperature and plate velocities, however, the extent to which the temporal evolution of the plate geometry affects such models remains poorly understood. We systematically explore the effect of dynamic migrating plate boundaries in mantle convection models featuring increasing complexity by using a numerical two-dimensional mantle convection model in a Cartesian geometry incorporating stiff tectonic plates, in which the plate velocities and plate boundaries evolve dynamically in response to the buoyancy distribution within the convecting system. We implement two simple migration rules: divergent plate boundaries migrate to simulate symmetric sea-floor spreading and convergent plate boundaries migrate to simulate the subduction of older plate by younger plate, thus modelling asymmetric subduction. We investigate the effects of plate size and number, mantle internal heating rate and mantle viscosity stratification on time-dependent features of our calculations such as the plate velocities, plate ages and plate sizes. We also investigate how plate boundary migration constrains parameters such as mean mantle temperature and surface heat flux. Study of these time-dependent features will help us to further answer questions about plate reorganization events and flow reversals, and to what extent deep mantle processes may be expressed in the history of plate motion.
Gait A.
Lowman Julian P.
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