Geochemistry of mantle-core differentiation at high pressure
Article Abstract:
Agreement between the nickel (Ni) and cobalt (Co) levels in the mantle, and chemical equilibrium between alloy and silicate at high pressures indicates that Earth's core formed from liquid magma. The depth of the magma was probably 750-1,100 km. Ni and Co become less iron-loving (siderophilic) with an increase in pressure but the decrease is higher for Ni. The Ni and Co partition coefficients becomes almost equivalent near 28 GPa. Sulphur becomes more siderophilic with an increase in pressure and is the main light element in the core.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
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A sharp and flat section of the core-mantle boundary
Article Abstract:
The structure of a 350-kilometer-long portion of the core-mantle boundary (CMB) beneath the northeast Pacific was determined by measuring seismic waves that change from shear waves to compression waves after reflecting off the CMB. This section of the CMB is characterized by an amplitude of less than 500 meters, an absence of sharp radial gradients in the 400 kilometers above the boundary and a mantle-to-core transition of less than 1 kilometer in thickness. Hence the mantle in this region is probably not chemically heterogeneous.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
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Mantle cookbook calibration
Article Abstract:
Research examining the chemistry of the Earth's mantle is presented. Particular attention is given to the types of pressure calibration existent in the Earth's interior and to calculations of the equation of state of gold. It is concluded that there are two classes of equations of state.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2001
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