Accretion of the Earth and segregation of its core

Details Accretion of the Earth and segregation of its core Accretion of the Earth and segregation of its core

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006natur.441..825w&link_type=abstract

Nature, Volume 441, Issue 7095, pp. 825-833 (2006).

Computer Science

53

Scientific paper

The Earth took 30-40 million years to accrete from smaller `planetesimals'. Many of these planetesimals had metallic iron cores and during growth of the Earth this metal re-equilibrated with the Earth's silicate mantle, extracting siderophile (`iron-loving') elements into the Earth's iron-rich core. The current composition of the mantle indicates that much of the re-equilibration took place in a deep (> 400km) molten silicate layer, or `magma ocean', and that conditions became more oxidizing with time as the Earth grew. The high-pressure nature of the core-forming process led to the Earth's core being richer in low-atomic-number elements, notably silicon and possibly oxygen, than the cores of the smaller planetesimal building blocks.

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