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Arising from: B. J. Wood A. N. Halliday 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 Halliday 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. 2006 Nature Publishing Group.

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Compilation and indexing terms, Copyright 2018 Elsevier Inc.<br/>20064510228587<br/>Chrono-meters<br/>Core-formation<br/>Diachronous core formation