The dynamical structures of D'' and deep plumes in a non-Newtonian mantle

Details The dynamical structures of D'' and deep plumes in a non-Newtonian mantle The dynamical structures of D'' and deep plumes in a non-Newtonian mantle

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pepi...34...57l&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 34, Issue 1-2, p. 57-67.

Physics

25

Scientific paper

The dynamical structures of the D'' layer and deep-mantle plumes have been determined for a mantle with a power-law-creep rheology, generalising recent Newtonian analyses. The lateral scales of D'' and plumes are determined by a balance between thermal diffusive-thickening and lateral inflow. The non-Newtonian effect of concentrating shear in regions of high stress acts to thicken the region of rapid flow in both D'' and plumes. This effect is nearly counterbalanced by the increased lateral inflow in the non-Newtonian case, resulting in a modest broadening of the lateral scales of the regions of rapid flow. These changes are structurally unimportant and the essential physics of core cooling, via convective flow in a thin D'' layer and narrow plumes, is remarkably independent of mantle rheology.
Permanent address: Geophysical Fluid Dynamics Institute, Florida State University, Tallahassee, FL 32306, U.S.A.

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