Diffusion creep in perovskite - Implications for the rheology of the lower mantle

Details Diffusion creep in perovskite - Implications for the rheology of the lower mantle Diffusion creep in perovskite - Implications for the rheology of the lower mantle

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sci...255.1238k&link_type=abstract

Science (ISSN 0036-8075), vol. 255, March 6, 1992, p. 1238-1240.

Mathematics

Logic

82

Creep Properties, Earth Mantle, High Temperature Environments, Particle Diffusion, Perovskites, Rheology, Creep Tests, Grain Size, Phase Transformations, Plastic Flow, Stress-Strain Relationships, Subduction (Geology)

Scientific paper

High-temperature creep experiments on polycrystalline perovskite (CaTiO3), an analog of (Mg,Fe)SiO3 perovskite of the lower mantle, suggest that (grain size-sensitive) diffusion creep is important in the lower mantle and show that creep rate is enhanced by the transformation from the orthorhombic to the tetragonal structure. These observations suggest that grain-size reduction after a subducting slab passes through the 670-kilometer discontinuity or after a phase transformation from orthorhombic to tetragonal in perovskite will result in rheological softening in the top portions of the lower mantle.

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