9:15 AM - 9:30 AM
[SIT10-02] Plume, superplume, plate tectonics, and Earth system
Keywords:plate tectonics, superplume, Earth system
Mantle convection in the spherical planets follow the 3D shape as plumes and superplumes from the depth, but it shows platy mode on or near the surface. When the surface is covered by liquid water which plays a critical role to decrease frictional intensity, hence causes the operation of plate tectonics. Plate tectonics provides a mild surface environment on the rocky planet. The three-fold coupling of tectonics, superficial plate tectonics, plume and superplume tectonics in the middle depth, and core tectonics in the deepest place is the cause of the characteristics of habitable planet. One more additional feature for habitability could be a small amount of water on the Earth, by which huge landmass can appear above sea-level.
Superplume operates probably only after 1.0Ga after the formation of the Earth, because of the extensive amounts of slab graveyards can generated and form a supercontinent. Those slab graveyard partially melted to form buoyant restites and sinks of
partial melt enriched in FeO to grow anti-crust above CMB.