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Rapid accretion and early core formation on asteroids and the terrestrial planets from Hf–W chronometry


The timescales and mechanisms for the formation and chemical differentiation of the planets can be quantified using the radioactive decay of short-lived isotopes1,2,3,4,5,6,7,8,9,10. Of these, the 182Hf-to-182W decay is ideally suited for dating core formation in planetary bodies1,2,3,4,5. In an earlier study, the W isotope composition1 of the Earth's mantle was used to infer that core formation was late1 (≥60 million years after the beginning of the Solar System) and that accretion was a protracted process11,12. The correct interpretation of Hf–W data depends, however, on accurate knowledge of the initial abundance of 182Hf in the Solar System and the W isotope composition of chondritic meteorites. Here we report Hf–W data for carbonaceous and H chondrite meteorites that lead to timescales of accretion and core formation significantly different from those calculated previously1,3,5,11,12. The revised ages for Vesta, Mars and Earth indicate rapid accretion, and show that the timescale for core formation decreases with decreasing size of the planet. We conclude that core formation in the terrestrial planets and the formation of the Moon must have occurred during the first 30 million years of the life of the Solar System.

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Figure 1: ɛw values of carbonaceous chondrites compared with those of the Toluca iron meteorite and terrestrial samples analysed in this study.
Figure 2: ɛw versus 180Hf/184W for different fractions of the H chondrites Ste Marguerite (a) and Forest Vale (b).
Figure 3: Time of core formation in Myr after CAI condensation for Vesta, Mars, Earth and Moon versus planet radius as deduced from Hf–W systematics.

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We thank the Muséum National d'Histoire Naturelle (Paris) for providing the meteorites Ste Marguerite and Forest Vale, the MPI Mainz for the carbonaceous chondrites, E. Scherer for discussions, and M. Drake, A. Halliday and D. Papanastassiou for comments and suggestions. This work was supported by the Deutsche Forschungsgemeinschaft as part of the research priority programme ‘Mars and the terrestrial planets’.

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Correspondence to T. Kleine.

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Kleine, T., Münker, C., Mezger, K. et al. Rapid accretion and early core formation on asteroids and the terrestrial planets from Hf–W chronometry. Nature 418, 952–955 (2002).

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