Core formation in the Moon: The mystery of the excess depletion of Mo, W and P

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Abundance, Geochemistry, Lunar Composition, Lunar Geology, Meteoritic Composition, Molybdenum, Phosphorus, Tungsten, Depletion, Melting, Moon

Scientific paper

We have evaluated siderophile element depletion models for the Moon in light of our improved statistical treatment of siderophile element abundance data and new information on the physics of core formation. If core formation occurred in the Moon at the large degrees of partial melting necessary for metal segregation, according to recent estimates, then a significant inconsistency (not seen in the eucrite parent body) exists in the depletion of the incompatible siderophile elements Mo, W, and P, compared to other siderophile elements in the Moon. The siderophile data, with the exception of Mo, are most consistent with terrestrial initial siderophile abundances and segregation of a very small core in the Moon. Our improved abundance estimates and possible explanations for these discrepancies are discussed.

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