W/Hf Fractionation in Chondrites and the Earth: Constraints on Timing of Core Formation

Details W/Hf Fractionation in Chondrites and the Earth: Constraints on Timing of Core Formation W/Hf Fractionation in Chondrites and the Earth: Constraints on Timing of Core Formation

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..957n&link_type=abstract

Lunar and Planetary Science, volume 27, page 957

Physics

Accretion, Cores: Formation, Earth, Hafnium, Tungsten

Scientific paper

The recent measurements of the Hf and W isotope systematics in terrestrial and meteorite material has led Lee and Halliday to conclude that terrestrial core formation occurred at least 60 Myr after the formation of the iron meteorites. This calculation depends on assumptions regarding the Hf/W ratio for the bulk silicate Earth, and for the ratio in the chondritic material from which the iron meteorites, and the Earth formed. A new study of the abundance and depletion of W in the Earth, relative to refractory lithophile elements, such as Hf, provides constraints on the terrestrial Hf/W ratio. In the chondrites, the ratio of W to refractory lithophile elements is also variable, because W did not fully participate in the metal-silicate fractionation which occurred in the solar nebula. Therefore, the uncertainties in the Hf/W ratios in the chondrites and in the Earth must be considered to determine the constraints on the timing of core formation in the Earth. In the case of the heterogeneous accretion theory, W is accreted to the Earth's primitive mantle in an additive process, which has important implications for the significance of the Hf-W isotope systematics.

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