limites convergentes: zonas de subduccion. prismas de acrecion, arcos magmaticos
TRANSCRIPT
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Limites convergentes: zonas de subduccion. Prismas de acrecion, arcos magmaticos
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Plate tectonics Convergentboundaries
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Plate tectonics Convergentboundaries 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 kmPlate
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
Free slip Free slip
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First subduction model : 2D
Boundary conditions
No slip
Plate
Upper mantle
Lower mantle
Free slip
Free slip Free slip
No slip
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Governing equations
Rayleigh-Taylor Instability: dense slab sinks into a less dense mantle
0v
… conservation of mass, incompressible medium
gp
i
j
j
iij x
v
x
v
… conservation of momentum
… deviatoric stress tensorwith
no energy equation
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Rheology
Viscous mantle
Viscoplastic plate
.constmantle
yieldcreepyield
yieldcreepcreep
II
yieldyield e2
IIcreepcreep e 2
Viscous Plastic
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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
fixedend
free slip top boundary
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Edge of the slab
extreme case:free sliptear zone
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Top boundary condition
plate bottom fixed
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Sides boundary conditions
Freeslip onthe sides
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3D subduction results
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Lifecycle of the subduction
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Reorganization of the flow