Abstract
The interpretation of data on lead isotopes in mantle material indicates that some of the lead has been pumped into the core during geological time. Such a continuous lead loss yields an increase of the U /Pb ratio in the mantle. Quantitative modelling of this effect permits an evaluation of the core’s growth curve. In the preferred model, 85% of the core would have been formed in the early period of the Earth’s history (50-200 Ma after 4.55 Ga ago) and 15% later on, and its accretion continues. Some of the consequences of such a process are reviewed.
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