Chemical compositions of the outer core examined by first principles calculations. A seismologically consistent compositional model of Earth’s core. Experimentally determined the partitioning of hydrogen between liquid Fe and molten silicate under high pressure and high temperature corresponding to conditions of core-forming metal segregation from silicate. Experimental evidence for hydrogen incorporation into Earth’s core. Strong sequestration of hydrogen into the Earth’s core during planetary differentiation. Ab initio calculations showing how water partitions between silicate and metal, thus, showing that the Earth’s core may act as a large reservoir for water. The Earth’s core as a reservoir of water. The carbon content of Earth and its core.
Crystallization of silicon dioxide and compositional evolution of the Earth’s core. High pressure metal–silicate partitioning of Ni, Co, V, Cr, Si, and O. A sulfur-poor terrestrial core inferred from metal–silicate partitioning experiments.
Experiments on turbulent metal-silicate mixing in a magma ocean. Experimental constraints on an MgO exsolution-driven dynamo. Magnesium partitioning between Earth’s mantle and core and its potential to drive an early exsolution geodynamo. The solubility of heat-producing elements in Earth’s core. Rates of protoplanetary accretion and differentiation set nitrogen budget of rocky planets. The almost lithophile character of nitrogen during core formation. in Encyclopedia of Geology 2nd edn (eds Elias, S. Light elements in the Earth’s outer core: a critical review. Accretion of the Earth and segregation of its core. Geochemistry of mantle–core differentiation at high pressure. The first study to show that Ni and Co become less siderophile with increasing pressure and that segregation of core metal at the base of a deep magma ocean could explain the Ni and Co contents of the bulk silicate Earth. The influence of pressure and temperature on the metal-silicate partition coefficients of nickel and cobalt in a model C1 chondrite and implications for metal segregation in a deep magma ocean. Planet formation: key mechanisms and global models. A.) 1–12 (American Geophysical Union, 2016).ĭziewonski, A.
LIGHT AS ELEMENT SERIES
in Deep Earth: Physics and Chemistry of the Lower Mantle and Core, Geophysical Monograph Series Vol. Low melting temperature of anhydrous mantle materials at the core-mantle boundary. Low core-mantle boundary temperature inferred from the solidus of pyrolite. Density and composition of mantle and core. Elasticity and constitution of the Earth’s interior. While the exact composition of the core remains unknown, tighter constraints on core temperature and better connections between the solid inner core and the liquid outer core compositions will help narrow the range of potential light element compositions.īirch, F. In this Review, we discuss the properties and phase relations of iron alloys under high-pressure and high-temperature conditions relevant to the Earth’s core. However, owing to its inaccessibility, estimates of core composition can only be indirectly obtained by matching results from high-pressure experiments and theoretical calculations with seismic observations. Earth’s outer and inner core exhibit a density deficit relative to pure iron, attributed to the presence of substantial amounts of low atomic number ‘light’ elements, such as sulfur, silicon, oxygen, carbon and hydrogen. Constraining the core’s composition is essential for understanding Earth accretion, core formation and the sustainment of Earth’s magnetic field.
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