Accretion and Early History of the Earth: Constraints Imposed by NI and CO Abundances in the Earth's Mantle

Details Accretion and Early History of the Earth: Constraints Imposed by NI and CO Abundances in the Earth's Mantle Accretion and Early History of the Earth: Constraints Imposed by NI and CO Abundances in the Earth's Mantle

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..559h&link_type=abstract

Lunar and Planetary Science, volume 27, page 559

Computer Science

1

Earth: Accretion Of, Earth: Core Formation, Earth: History, Metal-Silicate Partition Coefficients, Nickel/Carbon Ratio

Scientific paper

The distribution of siderophile elements between the Earth's metal core and its silicate mantle provides information on the core forming process and thus on the early history of the Earth. Here we examine the behavior of Ni and Co during core formation. The Ni/Co-ratio is useful because both elements have similar cosmochemical volatility and occur in the same oxidation state (+2) in silicate melts. A major difference is their affinity to metallic iron leading to ten times higher metal-silicate partition coefficients for Ni compared to Co at around 1400 degrees C and a pressure of one atmosphere. Recent determinations of metal/liquid-silicate partition coefficients at high pressures show that separation of metal from liquid silicates within the pressure range of the upper and probably also lower mantle cannot produce the observed chondritic Ni/Co-ratio in the Earth's mantle. This favours inhomogeneous accretion models. In addition, late Earth forming planetesimals must have been undifferentiated, differntiated objects have low Ni, Co mantles.

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