Aseismicity in the lower mantle by superplasticity of the descending slab

Details Aseismicity in the lower mantle by superplasticity of the descending slab Aseismicity in the lower mantle by superplasticity of the descending slab

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.351..140i&link_type=abstract

Nature (ISSN 0028-0836), vol. 351, May 9, 1991, p. 140, 141. MOESC-supported research.

Physics

42

Earth Mantle, Phase Transformations, Seismology, Slabs, Superplasticity, Dissociation, Earthquakes, Perovskites, Spinel

Scientific paper

It is argued here that the dissociation product of spinel in a descending slab in the earth's mantle is fine-grained and that its eutectic texture, combined with the low temperature in the slab, prevents grain growth. Fine-grained materials at moderately high temperatures and low strain rates exhibit superplastic behavior. The resulting viscous behavior of the slab below the spinel dissociation boundary may therefore account for the observed absence of seismicity below about 700 km depth, even if slabs do penetrate into the lower mantle.

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