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Convection modeling of the postperovskite transition and constraints on the thermal conditions near the core mantle boundary. Arie van den Berg, Utrecht University David Yuen, University of Minnesota. Outline. Seismic observations of irregular D” old and new

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slide1

Convection modeling of the postperovskite transition and constraints on the thermal conditions near the core mantle boundary

Arie van den Berg, Utrecht University

David Yuen, University of Minnesota

outline
Outline
  • Seismic observations of irregular D” old and new
  • Interpretation related to Pv/PPv transition

> estimate thermal conditions near CMB

  • Modelling results of slab interaction with Pv/PPv

feasibility of heat flow estimates and thermal conductivity

  • Conclusions
slide9

Pv/PPv Slope 11 MPa/K,

CMB intercept ~3550 K

Hirose, 2007

model of subducting slab interacting with the pv ppv zone of d
model of subducting slab interacting with the PV/PPv zone of D”
  • Extended Boussinesq – ppv phase boundary
  • T,P dep.visc. dv_T=1000, dv_P=100
  • Layered piecewise uniform thermal conductivity
  • 2D domain 3000X3000km

- element resolution down to 5 km near CMB

  • Crustal (100) marker chain
slide15

Spinel/Pv

Crustal

markers

Pv

PPv

slide22

Single tracer T-depth paths

Crustal markers in bottom PV

(high k case)

some conclusions

Some conclusions

Precursors to PKP from small scale scatterers near CMB can be

related to heterogeneity in the Pv/PPv region due to complex

phase distribution and/or crustal remnants

PPv linked to D” allowstemperature estimates near CMB from

seismic mapping of PPv > Pv in the thermal boundary layer

Heatflow estimates based on simple linear T profiles are feasible

but require better constraints of k_cmb