Superplasticity in Earth's Lower Mantle: Evidence from Seismic Anisotropy and Rock Physics

Details Superplasticity in Earth's Lower Mantle: Evidence from Seismic Anisotropy and Rock Physics Superplasticity in Earth's Lower Mantle: Evidence from Seismic Anisotropy and Rock Physics

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sci...270..458k&link_type=abstract

Science, Volume 270, Issue 5235, pp. 458-461

Mathematics

Logic

74

Scientific paper

In contrast to the upper mantle, the lower mantle of the Earth is elastically nearly isotropic, although its dominant constituent mineral [(Mg,Fe)SiO_3 perovskite] is highly anisotropic. On the basis of high-temperature experiments on fabric development in an analog CaTiO_3 perovskite and the elastic constants of MgSiO_3 perovskite, the seismic anisotropy was calculated, for the lower mantle. The results show that absence of anisotropy is strong evidence for deformation by superplasticity. In this case, no significant transient creep is expected in the lower mantle and the viscosity of the lower mantle is sensitive to grain size; hence, a reduction in grain size will result in rheological weakening.

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