How did the dense and light components of Theia contribute to the deep Earth structures after impact?

Some of its dense core may have sunk directly to the core-mantle boundary, while the lighter, silicate mantle material of Theia remained suspended in Earth’s mantle

The persistence of the Large Low-Shear-Velocity Provinces (LLSVPs) is explained by the differential fate of Theia’s internal structure during the collision. When Theia struck, its component materials did not mix homogeneously into Earth. The impactor's dense core material, being heavier, is theorized to have sunk gravitationally through the molten Earth until it reached the bottom layer, pooling at the core-mantle boundary. Conversely, the lighter, silicate mantle material originating from Theia was less dense than the rest of the Earth's mantle, causing it to remain suspended or collect in distinct, massive blobs within the surrounding terrestrial mantle, eventually forming the LLSVPs observed today.