Evolution of Planetary Cores and the Earth-Moon System from Nb/Ta Systematics-Reference-Cited by-同舟云学术

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

Published:2003-07-04 Issue:5629 Volume:301 Page:84-87
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Münker Carsten¹,Pfänder Jörg A.¹,Weyer Stefan¹,Büchl Anette¹,Kleine Thorsten¹,Mezger Klaus¹

Affiliation:

1. Institut für Mineralogie, Corrensstrasse 24, Universität Münster, 48149 Münster, Germany. Max-Planck-Institut für Chemie, Postfach 3060, 55020 Mainz, Germany.

Abstract

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.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference38 articles.

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4. J. H. Jones, H. Palme, in Origin of the Earth and Moon, R. M. Canup, K. Righter, Eds. (Univ. of Arizona Press, Tucson, AZ, 2000), pp. 197–216, and references therein.

5. W. Benz, A. G. W. Cameron, H. J. Melosh, Icarus81, 113 (1989).

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