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Effect of depth-dependent viscosity on the planform of mantle convection

Nature volume 379, pages 436–438 (1996)Cite this article

Abstract

LITHOSPHERIC plate motions at the Earth's surface result from thermal convection in the mantle1. Understanding mantle convection is made difficult by variations in the material properties of rocks as pressure and temperature increase from the surface to the core. The plates themselves result from high rock strength and brittle failure at low temperature near the surface. In the deeper mantle, elevated pressure may increase the effective viscosity by orders of magnitude2–5. The influence of depth-dependent viscosity on convection has been explored in two-dimensional numerical experiments6–8, but planforms must be studied in three dimensions. Although three-dimensional plan-forms can be elucidated by laboratory fluid dynamic experiments9,10, such experiments cannot simulate depth-dependent rheology. Here we use a three-dimensional spherical convection model11,12 to show that a modest increase in mantle viscosity with depth has a marked effect on the planform of convection, resulting in long, linear downwellings from the upper surface boundary layer and a surprisingly 'red' thermal heterogeneity spectrum, as observed for the Earth's mantle13. These effects of depth-dependent viscosity may be comparable to the effects of the plates themselves.

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Authors and Affiliations

  1. Institute of Geophysics and Planetary Physics, Los Alamos National Laboratory, Los Alamos, New Mexico, 87544, USA

    Hans-Peter Bunge & John R. Baumgardner

  2. Department of Geology and Geophysics, University of California, Berkeley, California, 94720, USA

    Hans-Peter Bunge & Mark A. Richards

Authors
  1. Hans-Peter Bunge
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  2. Mark A. Richards
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  3. John R. Baumgardner
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Bunge, HP., Richards, M. & Baumgardner, J. Effect of depth-dependent viscosity on the planform of mantle convection. Nature 379, 436–438 (1996). https://doi.org/10.1038/379436a0

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