Trace element abundances and the chondritic Earth model

Details Trace element abundances and the chondritic Earth model Trace element abundances and the chondritic Earth model

Dec 1964

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964gecoa..28.1989t&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 28, Issue 12, pp.1989-1998

Computer Science

10

Scientific paper

The proportions of continental and oceanic crust relative to mantle and core are given. Allowance is made for oxidation of core material and the correction adds 15 per cent to the mass of the primitive Earth (excluding volatiles). Chondritic abundances for lithophile and siderophile elements are selected mainly from H group chondrites. The chalcophile elements are not considered. Crustal abundances from Taylor (1964) are used as the basis for calculating the concentration of elements in the crust for an Earth of chondritic composition. It is concluded that the Earth contains about twice as much U and Th and about one third the alkali metal content of chondrites. Fractionation processes have affected both the parent material of chondrites and the Earth. The geochemical fractionation of the Earth is considered to be due to the strong upward concentration of elements unable to enter into 6-fold co-ordination with oxygen in close packed structures. All the heat producing elements are probably above a depth of 400 km and are probably closer to the surface.

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