Studia Geophysica et Geodaetica

, Volume 41, Issue 3, pp 297–306 | Cite as

Effect of a Viscosity Interface at 1000 km Depth on Mantle Circulation

  • Hana ČIžková
  • Ondŕej Čadek

Abstract

We present the preliminary results of axisymmetric numerical simulations of thermal convection in the mantle with a phase transition boundary at 660 km depth and a viscosity interface at 1000 km depth. The results, obtained for Ra = 2 × 106, are compared with the case when both the phase and the viscosity boundaries are located at the same depth of 660 km.

Mantle convection phase transitions mantle viscosity 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Akaogi, M. and Ito, E., 1993: Heat capacity of MgSiO3 perovskite. Geophys. Res. Lett., 20, 105-108.Google Scholar
  2. Bunge, H.P., Richards, M.A. and Baumgardner, J.M., 1996: Effect of depth dependent viscosity on the planform of mantle convection. Nature, 379, 436-438.Google Scholar
  3. Čadek, O., 1989: Spherical tensor approach to the solution of the mantle stress problem. Studia geoph. et geod., 33, 177-197.Google Scholar
  4. Čadek, O., Kývalová, H. and Yuen, D.A., 1995: Geological implications from the correlation of surface geology and seismic tomographic structure. Earth Planet. Sci. Lett., 136, 615-627.Google Scholar
  5. Čížková, H., Čadek, O. and van den Berg, A.P., 1997: Influence of the load wavelength on permeability of a viscosity interface in the mantle. Studia geoph. et geod., 41, 64-72.Google Scholar
  6. Čížková, H., Čadek, O., Yuen, D.A. and Zhou, H., 1996: Slope of the geoid spectrum and constraints on mantle viscosity stratification. Geophys. Res. Lett., 23, 3063-3066.Google Scholar
  7. Cserepes, L. and Yuen, D.A., 1997: Dynamical consequences of mid-mantle viscosity stratification on mantle flows with an endothermic phase transition. Geophys. Res. Lett., 24, 181-184.Google Scholar
  8. Dziewonski, A.M. and Anderson, D.L., 1981: Preliminary reference Earth model. Phys. Earth Planet. Inter., 25, 297-356.Google Scholar
  9. Fornberg, B., 1988: Generation of finite difference formulas on arbitrarily spaced grids. Math. Comput., 51, 699-706.Google Scholar
  10. Forte, A.M. and Mitrovica, J.X., 1996: New inferences of mantle viscosity from joint inversion of long-wavelength mantle convection and postglacial rebound data. Geophys. Res. Lett., 23, 1147-1150.Google Scholar
  11. Ita, J. and King, S.D., 1994: Sensitivity of convection with an endothermic phase change to the form of the governing equations, initial conditions, boundary conditions, and equation of state. J. Geophys. Res., 99, 15919-15938.Google Scholar
  12. Jarvis, G.T. and Peltier, W.R.: Convection models and geophysical observations. In: W.R. Peltier (ed.), Mantle Convection, Plate Tectonics and Global Dynamics, Gordon and Breach Science Publishers, New York, 1989.Google Scholar
  13. Jones, M.N.: Spherical Harmonics and Tensors for Classical Field Theory. Research Studies Press Ltd., Letchwork, England, 1985.Google Scholar
  14. Kawakatsu, H. and Niu, F., 1994: Seismic evidence for a 920-km discontinuity in the mantle. Nature, 371, 301-305.Google Scholar
  15. Kývalová, H., Čadek, O. and Yuen, D.A., 1995: Correlation analysis between subduction in the last 180 Myr and lateral seismic structure in the lower mantle. Geophys. Res. Lett., 22, 1281-1284.Google Scholar
  16. Martinec, Z., 1989: Program to calculate the spectral harmonic expansion coefficients of the two scalar fields product. Comp. Phys. Commun., 54, 177-182.Google Scholar
  17. Pari, G. and Peltier, W.R., 1995: The heat flow constraint on mantle tomography-based convection models: Towards a geodynamically self-consistent inference of mantle viscosity. J. Geophys. Res., 100, 12731-12752.Google Scholar
  18. Tackley, P.J., 1995: Mantle dynamics: Influence of the transition zone. US National Report of the IUGG, Rev. Geophys., Supplement, 275-282.Google Scholar
  19. Tackley, P.J., 1996: On the ability of phase transitions and viscosity layering to induce long-wavelength heterogeneity in the mantle. Geophys. Res. Lett., 23, 1985-1988.Google Scholar
  20. van Keken, P., Yuen, D.A. and van den Berg, A.P., 1992: Pulsating diapiric flows: Consequences of vertical variations in mantle creep laws. Earth Planet. Sci. Lett., 112, 179-194.Google Scholar
  21. Wen, L. and Anderson, D.L., 1995: The fate of slabs inferred from 130 million years of subduction and seismic tomography. Earth Planet. Sci. Lett., 133, 185-198.Google Scholar

Copyright information

© StudiaGeo s.r.o. 1997

Authors and Affiliations

  • Hana ČIžková
    • 1
  • Ondŕej Čadek
    • 1
  1. 1.Department of GeophysicsCharles UniversityPragueCzech Republic

Personalised recommendations