Late formation and prolonged differentiation of the Moon inferred from W isotopes in lunar metals

Article Abstract:

The study of tungsten isotopes for lunar metal that do not comprise of measurable quantity of Ta-derived W isotope is described. It is concluded that since all the metals of the lunar rocks have the identical [182.sup.W]/[184.sup.W] ratios similar to that of the terrestrial materials, the lunar magma ocean crystallized approximately after the first 60 million year of the Solar System and that Moon is derived mainly from the terrestrial materials.

Science & research, Primary nonferrous metals, not elsewhere classified, Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum), Tungsten, Analysis, Composition, Moon, Crystallization, Atomic properties, Lunar petrology

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Partitioning of nickel and cobalt between silicate perovskite and metal at pressures up to 80 GPa

Article Abstract:

Diamond-cell experiments on the partitioning of Ni and Co between the main lower-mantle mineral ((Mg,Fe)SiO3-perovskite) and an iron-rich metal alloy at pressures of up to 80 GPa indicate that the siderophile character of Ni and Co falls strongly with pressure. The abundance of Ni and Co and the Ni/Co ratio seen in samples taken from the Earth's mantle seem to be consistent with a homogenous accretion model.

Crust (Geology)

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Evidence for a late chondritic veneer in the Earth's mantle from high-pressure partitioning of palladium and platinum

Article Abstract:

The siderophile elements such as platinum are discussed with reference to their preference for iron. A study which reveals that these elements could have been formed after the Earth's mantle is presented.

Letter to the Editor, Platinum group, Platinum group metals, Surface (Geology)

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