MICHAEL MANGA: Recent Refereed Publications
Manga, M. (1996) Mixing of heterogeneities in the mantle: Effect of
viscosity differences, Geophysical Research Letters, vol. 23, 403-406.
The effect of viscosity variations associated with large scale chemical
heterogeneities on mixing in the mantle is studied for a model
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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