Mathematics – Logic
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.1927v&link_type=abstract
Geophysical Research Letters (ISSN 0094-8534), vol. 20, no. 18, p. 1927-1930.
Mathematics
Logic
9
Earth Mantle, Incompressible Fluids, Rheology, Strain Rate, Viscous Fluids, Boussinesq Approximation, Dynamic Models, Prandtl Number, Rayleigh Number
Scientific paper
We have studied the effects of rheological boundaries in the upper mantle on the dynamics of inducing pulsating diapiric plumes. We have compared the effects due to shallower rheological interfaces in the upper mantle on the timescales of the pulsations. Comparing with a basic model with a rheological interface at 670 km depth, we find that timescales between pulsations can be reduced considerably down to a few million years by adding another theological boundary at 400 km depth. These results suggest that short timescale diapiric flows may be generated from relatively stationary upwellings from the lower mantle because of the presence of rheological boundaries in the shallow upper mantle.
van den Berg Arie P.
van Keken Peter E.
Yuen David A.
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