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Brief Communications Arising
Nature 444, E1-E2 (2 November 2006) | doi:10.1038/nature05359; Published online 1 November 2006
Geochemistry: How well can Pb isotopes date core formation?
Balz S. Kamber1 & Jan D. Kramers2
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.
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Geochemistry Does U?Pb date Earth's core formation?Nature Brief Communication (02 Nov 2006)
Geochemistry Does U?Pb date Earth's core formation?; How well can Pb isotopes date core formation? (Reply)Nature Brief Communication (02 Nov 2006)
Rapid accretion and early core formation on asteroids and the terrestrial planets from Hf?W chronometryNature Letters to Editor (29 Aug 2002)
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