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How well can Pb isotopes date core formation?

Author

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  • Balz S. Kamber

    (Laurentian University)

  • Jan D. Kramers

    (University of Bern)

Abstract

Arising from: B. J. Wood & A. N. Halliday Nature 437, 1345–1348 (2005); Wood & Halliday reply Timescale and the physics of planetary core formation are essential constraints for models of Earth's accretion and early differentiation. Wood and Halliday1 use the apparent mismatch in core-formation dates determined from tungsten (W) and lead (Pb) chrono-meters to argue for a two-stage core formation, involving an early phase of metal segregation followed by a protracted episode of sulphide melt addition. However, we show here that crust–;mantle Pb isotope systematics do not require diachronous core formation. Our observations indicate that very early (≤ 35 Myr) core formation and planet accretion remain the most plausible scenario.

Suggested Citation

  • Balz S. Kamber & Jan D. Kramers, 2006. "How well can Pb isotopes date core formation?," Nature, Nature, vol. 444(7115), pages 1-2, November.
    • Handle: RePEc:nat:nature:v:444:y:2006:i:7115:d:10.1038_nature05359
    DOI: 10.1038/nature05359
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