Figure 8: Schematic illustration of the LPO of pPv-MgSiO3 in the D′′ layer. | Nature Communications

Figure 8: Schematic illustration of the LPO of pPv-MgSiO3 in the D′′ layer.

From: Elastic anisotropy of experimental analogues of perovskite and post-perovskite help to interpret D′′ diversity

Figure 8

From a mineral physics viewpoint, the Pv slab (purple region) transforms to pPv (light blue region) and the pPv slab then moves along the path of mantle convection with deformation (light-green region). In contrast, from seismic observation, the region of the Circum-Pacific rim has VTI anisotropy of VSH>VSV, while the region of the Central Pacific has complicated VTI with any magnitude relation; that is, VSH>VSV, VSH<VSV or VSH≈VSV. The region of the Atlantic Ocean (white circle) has VTI with VSH≈VSV, suggesting isotropy or negligible LPO of pPv-MgSiO3. The speculated aligned axes of pPv LPO are shown by arrows for each region; the vertical c axis beneath the Circum-Pacific rim and the vertical b axis beneath the Central Pacific.

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