Chemical aspects of the formation of the core
- 20 August 1982
- journal article
- Published by The Royal Society in Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences
- Vol. 306 (1492) , 49-59
- https://doi.org/10.1098/rsta.1982.0065
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.Keywords
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