High-temperature creep experiments on polycrystalline perovskite (CaTiO 3 ), an analog of (Mg,Fe)SiO 3 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.
CITATION STYLE
Karato, S.-I., & Li, P. (1992). Diffusion Creep in Perovskite: Implications for the Rheology of the Lower Mantle. Science, 255(5049), 1238–1240. https://doi.org/10.1126/science.255.5049.1238
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