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Published byPrince Hackman Modified about 1 year ago

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Limites convergentes: zonas de subduccion. Prismas de acrecion, arcos magmaticos

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Plate tectonics Convergent boundaries

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Plate tectonics Convergent boundaries Collision Subduction

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Subduction modeling From 2D to 3D…

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Subduction modeling About the plate tectonics 2D subduction model 3D subduction model Future works

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Subduction modeling About the plate tectonics 2D subduction model 3D subduction model Future works

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Subduction modeling About the plate tectonics 2D subduction model 3D subduction model Future works

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First subduction model : 2D Rectangle domain Plate Upper mantle

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First subduction model : 2D Lengths of the domain 3120 km 660 km Plate Upper mantle Lower mantle 100 km

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First subduction model : 2D Boundary conditions No slip Plate Upper mantle Lower mantle

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First subduction model : 2D Boundary conditions No slip Plate Upper mantle Lower mantle Free slip

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First subduction model : 2D Boundary conditions No slip Plate Upper mantle Lower mantle Free slip

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First subduction model : 2D Boundary conditions No slip Plate Upper mantle Lower mantle Free slip No slip

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Governing equations Rayleigh-Taylor Instability: dense slab sinks into a less dense mantle … conservation of mass, incompressible medium … conservation of momentum … deviatoric stress tensorwith no energy equation

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Rheology Viscous mantle Viscoplastic plate ViscousPlastic

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The hardware: Horus supercomputer

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2D subduction results

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Lifecycle : flow reorganization

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Necessity of the third dimension Importance of the mantle flow Real subductions have a limited lateral extent Interactions on the lateral edges of subduction zones

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Subduction modeling About the plate tectonics 2D subduction model 3D subduction model Future works

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3D subduction model Same governing equations Same tools used … only a different setup

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3D subduction model upper mantle plate with subduction zone no upper plate Box size: big enough, for side walls to have little effect on subducting slab

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The level set field subducting slab only subducting part of the plate is included in the FE domain use level set to define and track the subducting plate

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Symmetry hypothesis assume symmetry: model only half of the domain free slip side boundary

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Bottom boundary condition higher viscosity in LM and phase boundary hinder convection fixed bottom boundary

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Slab boundary conditions plate fixed, to isolate effects of tearing and rollback fixed end free slip top boundary

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Edge of the slab extreme case: free slip tear zone

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Top boundary condition plate bottom fixed

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Sides boundary conditions Freeslip on the sides

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3D subduction results

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Lifecycle of the subduction

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Reorganization of the flow

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