Where are the two colossal, chemically distinct provinces identified by seismology situated deep within the lower mantle?

Answer

Beneath the African continent and under the Pacific Ocean

Modern seismology has successfully mapped two exceptionally large, dense structures located specifically in the deep lower mantle. One of these massive anomalies resides geographically below the African continent, while the other is positioned underneath the vast expanse of the Pacific Ocean. These structures are characterized by being chemically distinct and significantly denser than the standard mantle material surrounding them. Their sheer size, extending hundreds of kilometers in both height and width, marks them as extraordinary features that require a significant, singular origin event, such as the ingestion of a large, chemically unique planetary body fragment, rather than being a typical result of gradual planetary differentiation or localized thermal plumes.

Where are the two colossal, chemically distinct provinces identified by seismology situated deep within the lower mantle?

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