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

Limites convergentes: zonas de subduccion. Prismas de acrecion, arcos magmaticos. Plate tectonics. Convergent boundaries. Plate tectonics. Convergent boundaries. Collision Subduction. Subduction modeling. From 2D to 3D…. Subduction modeling. About the plate tectonics

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

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

  2. Plate tectonics Convergentboundaries

  3. Plate tectonics Convergentboundaries Collision Subduction

  4. Subduction modeling From 2D to 3D…

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

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

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

  8. First subduction model : 2D • Rectangle domain Plate Upper mantle

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

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

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

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

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

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

  15. Rheology • Viscous mantle • Viscoplastic plate Viscous Plastic

  16. The hardware: Horus supercomputer

  17. 2D subduction results

  18. Lifecycle : flow reorganization

  19. 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

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

  21. 3D subduction model • Same governing equations • Same tools used • … only a different setup

  22. 3D subduction model no upper plate plate with subduction zone upper mantle Box size: big enough, for side walls to have little effect on subducting slab

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

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

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

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

  27. Edge of the slab extreme case: free slip tear zone

  28. Top boundary condition plate bottom fixed

  29. Sides boundary conditions Freeslip on the sides

  30. 3D subduction results

  31. Lifecycle of the subduction

  32. Reorganization of the flow

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