Constraints on the moon's origin from the partitioning behaviour of tungsten

Details Constraints on the moon's origin from the partitioning behaviour of tungsten Constraints on the moon's origin from the partitioning behaviour of tungsten

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.297..210n&link_type=abstract

Nature, vol. 297, May 20, 1982, p. 210-212.

Physics

Geophysics

22

Lunar Composition, Lunar Evolution, Lunar Geology, Tungsten, Chondrites, Constraints, Depletion, Earth (Planet), Fractionation, Lanthanum, Lunar Core, Lunar Rocks, Metals, Silicates, Moon, Origin, Tungsten, Partitioning, Element Ratios, Abundance, Data, Lanthanum, Formation, Hypotheses, Fission, Metals, Silicates, Phases, Fractionation, Concentrations, Comparisons, Earth, Chondrites, Cores, Eucrites, Meteorites, Samples, Lunar, Partial Melting, Geophysics

Scientific paper

An evaluation is conducted of the parameters which control the partitioning of W between metal and silicate in the moon, taking into account information on the possible magnitudes of the lunar W depletion and the possible lunar metal content. A major question regarding depletion of W during partial melting is found to be related to the very homogeneous W/La ratios in lunar samples. It is concluded that a metal content consistent with present geophysical constraints on the size of a metallic lunar core could account for the depletion of W observed in lunar rocks. The low W/La ratio of the moon cannot be used as evidence for the formation of the moon from the earth's mantle by fission following terrestrial core formation. The approximate coincidence of W/La ratios in the earth, moon, and eucrite parent body may only reflect the operation of the same depletion mechanism in similar conditions on several parent bodies.

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