What is implied about planetary accretion if chemically distinct materials from an impactor persist in the mantle?

Answer

It suggests planet building is more like stacking blocks whose boundaries persist.

The existence of chemically distinct trapped materials suggests that the process of planet building is less like melting ingredients together evenly and more like stacking different, pre-formed blocks whose boundaries persist for eons.

What is implied about planetary accretion if chemically distinct materials from an impactor persist in the mantle?

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