Evolution of Planetary Cores and the Earth-Moon System from Nb/Ta Systematics

Details Evolution of Planetary Cores and the Earth-Moon System from Nb/Ta Systematics Evolution of Planetary Cores and the Earth-Moon System from Nb/Ta Systematics

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003sci...301...84m&link_type=abstract

Science, Volume 301, Issue 5629, pp. 84-88 (2003).

Physics

42

Scientific paper

It has been assumed that Nb and Ta are not fractionated during differentiation processes on terrestrial planets and that both elements are lithophile. High-precision measurements of Nb/Ta and Zr/Hf reveal that Nb is moderately siderophile at high pressures. Nb/Ta values in the bulk silicate Earth (14.0 +/- 0.3) and the Moon (17.0 +/- 0.8) are below the chondritic ratio of 19.9 +/- 0.6, in contrast to Mars and asteroids. The lunar Nb/Ta constrains the mass fraction of impactor material in the Moon to less than 65%. Moreover, the Moon-forming impact can be linked in time with the final core-mantle equilibration on Earth 4.533 billion years ago.

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