Chemical Aspects of the Formation of the Core

C. J. Allegre, B. Dupre, O. Brevart
1982 Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences  
The interpretation of data on lead isotopes in mantle m aterial indicates that some of the lead has been pum ped into the core during geological time. Such a continuous lead loss yields an increase of the U /P b ratio in the mantle. Q uantitative 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 E arth's history (50-200 M a after 4.55 Ga ago) and 15 % later on, and its accretion
more » ... ntinues. Some of the consequences of such a process are reviewed. 4 Vol. 306. A
doi:10.1098/rsta.1982.0065 fatcat:joe4oimgsba65hktlzz5fhl6je