Mixing of heterogeneities in the mantle: Effect of viscosity differences

Details Mixing of heterogeneities in the mantle: Effect of viscosity differences Mixing of heterogeneities in the mantle: Effect of viscosity differences

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996georl..23..403m&link_type=abstract

Geophysical Research Letters, Volume 23, Issue 4, p. 403-406

Physics

42

Tectonophysics: Dynamics Of Lithosphere And Mantle-General, Tectonophysics: Evolution Of The Earth, Tectonophysics: Rheology-General

Scientific paper

The effect of viscosity variations associated with large scale chemical heterogeneities on mixing in the mantle is studied for a model two-dimensional problem. Low viscosity regions are rapidly deformed, develop long tendrils, and are entrained towards regions of surface divergence. Very viscous regions are only slowly stretched; thus, geochemical reservoirs can persist relatively undisturbed for long periods of time if they are >O(10-100) times more viscous than the surrounding mantle. High viscosity ratio blobs have a tendency to aggregate, leading to the formation of large scale heterogeneities from smaller ones.

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