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Zinc metal-silicate fractionation provides experimental access to theconditions of core formation and Zn has been used to estimate the S contents ofthe Earth's core and of the bulk Earth, assuming that they share similarvolatility and that Zn was not partitioned into the Earth's core. We haveconducted a suite of partitioning experiments to characterize Zn metal-silicateelemental and isotopic fractionation as a function of time, temperature, andcomposition. Experiments were conducted at temperatures from 1473-2273K, withrun durations from 5-240 minutes for four starting materials. Chemical andisotopic equilibrium is achieved within 10 minutes. Zinc metal-silicateisotopic fractionation displays no resolvable dependence on temperature,composition, or oxygen fugacity. Thus, the Zn isotopic composition of silicatephases can be used as a proxy for bulk telluric bodies. Results from this studyand literature data were used to parameterize Zn metal-silicate partitioning asa function of temperature, pressure, and redox state. Using thisparameterization and viable formation conditions, we have estimated a range ofZn contents in the cores of iron meteorite parent bodies (i.e. iron meteorites)of ~0.1-150 ppm, in good agreement with natural observations. We havecalculated the first geochemical estimates for the Zn contents of the Earth'score and of the bulk Earth, at 242 +/-107 ppm and 114 +/-34 ppm (respectively),that consider the slightly siderophile behavior of Zn and are thereforesignificantly higher than previous estimates. Assuming similar volatility for Sand Zn, a chondritic S/Zn ratio, and considering our new estimates, we havecalculated a geochemical upper bound for the S content of the Earth's core of6.3 +/-1.9 wt%. This indicates that S may be a major contributor to the densitydeficit of the Earth's core or that the S/Zn ratio for the Earth isnon-chondritic.

Elemental partitioning and isotopic fractionation of Zn between metal and silicate and geochemical estimation of the S content of the Earth's core