Meteorite measurements and planet formation models together indicate that the solar nebula was isotopically zoned, that planetesimals formed within a few million years, and that Earth's volatiles came mostly from chondrite-like material with at most a few percent cometary contribution.
A) Primary accretion saw most siderophile elements segregate to the core
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Clues for Solar System Formation from Meteorites and their Parent Bodies
Meteorite measurements and planet formation models together indicate that the solar nebula was isotopically zoned, that planetesimals formed within a few million years, and that Earth's volatiles came mostly from chondrite-like material with at most a few percent cometary contribution.