The viscosity of the mantle

McKenzie, D. P. (1967) The viscosity of the mantle. Geophysical Journal of the Royal Astronomical Society, 14. pp. 297-305. ISSN 0016-8009 DOI 10.1111/j.1365-246X.1967.tb06246.x

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Official URL: http://gji.oxfordjournals.org/content/14/1-4/297.a...

Abstract

Creep under low stresses is by diffusion and has a linear relation between stress and strain rate; it also obeys the Navier-Stokes equation. Therefore the viscosity of the mantle may be calculated from solid state theory and also from the slow deformations of the Earth. The viscosities derived by these methods are in reasonable agreement, and both show that the viscosity of the lower mantle is ∼ 105 greater than that of the upper. This high viscosity prevents polar wandering and lower mantle convection. Some suggested modifications of the viscosity depth calculations from post glacial uplift may improve their accuracy considerably.

Item Type: Article
Uncontrolled Keywords: NIL AREP
Subjects: 02 - Geodynamics, Geophysics and Tectonics
Divisions: 02 - Geodynamics, Geophysics and Tectonics
Journal or Publication Title: Geophysical Journal of the Royal Astronomical Society
Volume: 14
Page Range: pp. 297-305
Identification Number: 10.1111/j.1365-246X.1967.tb06246.x
Depositing User: Sarah Humbert
Date Deposited: 21 May 2015 15:21
Last Modified: 21 May 2015 15:21
URI: http://eprints.esc.cam.ac.uk/id/eprint/3301

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