Texture development and TEM analysis of deformed CaIrO3: Implications for the D'' layer at the core-mantle boundary

Details Texture development and TEM analysis of deformed CaIrO3: Implications for the D'' layer at the core-mantle boundary Texture development and TEM analysis of deformed CaIrO3: Implications for the D'' layer at the core-mantle boundary

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3408306w&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 8, CiteID L08306

Physics

22

Mineralogy And Petrology: Petrography, Microstructures, And Textures, Mineralogy And Petrology: Experimental Mineralogy And Petrology, Mineral Physics: Creep And Deformation, Mineral Physics: Defects, Physical Properties Of Rocks: Plasticity, Diffusion, And Creep

Scientific paper

CaIrO3 is an isostructural analog for MgSiO3 post-perovskite (ppv), likely the dominant mineral phase in the D'' layer. At high temperature CaIrO3 undergoes a phase transition to a perovskite (pv) structure. We have performed deformation experiments of CaIrO3 pv and ppv with the deformation-DIA apparatus. The deformed pv does not display any discernable texture even after strong coaxial shortening. In contrast, ppv displays a strong lattice preferred orientation (LPO) with the a-axis parallel to the shear direction and the b-axis perpendicular to the shear plane. Calculation of the seismic properties predicts a shear wave splitting with a maximum of 2.7% in the shear plane, which is qualitatively compatible with seismic measurements. Ppv displayed a high density of (010)[100] dislocations, consistent with the textural results. Thus, our experiments on CaIrO3 pv and ppv are compatible with a seismically isotropic lower mantle and anisotropic D'' layer in the Earth.

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