Highly Siderophile Element Constraints on Accretion and Differentiation of the Earth-Moon System

Details Highly Siderophile Element Constraints on Accretion and Differentiation of the Earth-Moon System Highly Siderophile Element Constraints on Accretion and Differentiation of the Earth-Moon System

Jan 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sci...315..217d&link_type=abstract

Science, Volume 315, Issue 5809, pp. 217- (2007).

Computer Science

22

Scientific paper

A new combined rhenium-osmium- and platinum-group element data set for basalts from the Moon establishes that the basalts have uniformly low abundances of highly siderophile elements. The data set indicates a lunar mantle with long-term, chondritic, highly siderophile element ratios, but with absolute abundances that are over 20 times lower than those in Earth’s mantle. The results are consistent with silicate-metal equilibrium during a giant impact and core formation in both bodies, followed by post-core-formation late accretion that replenished their mantles with highly siderophile elements. The lunar mantle experienced late accretion that was similar in composition to that of Earth but volumetrically less than (~0.02% lunar mass) and terminated earlier than for Earth.

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