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 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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