Mantle stratification and long-term polar wander

Details Mantle stratification and long-term polar wander Mantle stratification and long-term polar wander

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989natur.339..373s&link_type=abstract

Nature (ISSN 0028-0836), vol. 339, June 1, 1989, p. 373-375. Research supported by the Agenzia Spaziale Italiana, NASA, and NSF.

Physics

34

Earth Mantle, Long Term Effects, Polar Wandering (Geology), Stratification, Convection, Differential Equations, Green'S Functions, Paleomagnetism, Viscosity

Scientific paper

The equations for polar wander are analyzed here, and it is shown that both viscosity and chemical stratification in the mantle are important in determining the rate of polar wander. The dynamical effects of chemical stratification and high viscosity in the lower mantle are to decrease polar-wander speed to a level consistent with the averaged velocities inferred from paleomagnetic data. Whole-mantle convection models, without nonadiabatic density jumps at 670 km depth and with viscosities less than 10 to the 23rd P, would produce wandering rates in excess of 5 deg/Myr.

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