Three regimes of mantle convection with non-Newtonian viscosity and stagnant lid convection on the terrestrial planets

Numerical simulations of convection with strongly temperature‐dependent viscosity suggest that non‐Newtonian viscosity convection (dislocation creep) passes through three convective regimes similar to those observed for Newtonian viscosity convection (diffusion creep): the small viscosity contrast r...

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Published in:Geophysical research letters 1997-08, Vol.24 (15), p.1907-1910
Main Authors: Solomatov, V. S., Moresi, L.-N.
Format: Article
Language:English
Subjects:
Cosmochemistry. Extraterrestrial geology
Earth sciences
Earth, ocean, space
Exact sciences and technology
Extraterrestrial geology
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description Numerical simulations of convection with strongly temperature‐dependent viscosity suggest that non‐Newtonian viscosity convection (dislocation creep) passes through three convective regimes similar to those observed for Newtonian viscosity convection (diffusion creep): the small viscosity contrast regime, the transitional regime and the stagnant lid regime. For realistic viscosity contrasts, mantle convection is in the stagnant lid regime characterized by formation of a very viscous, slowly creeping lid on top of an actively convecting mantle. This explains the tectonic style observed on the terrestrial planets and the Moon. On the other hand, this eliminates the possibility that the plates on Earth could be mobile due to non‐Newtonian viscosity. The nature of the mobility of lithospheric plates on Earth has yet to be explained.
doi_str_mv 10.1029/97GL01682
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subjects Cosmochemistry. Extraterrestrial geology
Earth sciences
Earth, ocean, space
Exact sciences and technology
Extraterrestrial geology
title Three regimes of mantle convection with non-Newtonian viscosity and stagnant lid convection on the terrestrial planets
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