Isotopic and elemental composition of chromium, iron, and nickel in type I deep-sea spheres

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Chromium, Iron, Nickel, Sea Water, Chondrites, Minerals, Chemical Elements, Concentration (Composition), Spheres, Fractionation

Scientific paper

We report analyses of Cr, Fe, and Ni in type I deep-sea spheres with masses ranging from 43 to 246 mg. The isotopic compositions of Cr and of Fe were measured by TIMS; the elemental concentrations of Cr, Fe, and Ni and the isotopic compositions of Ni were measured by ICPMS. In most spheres evaporation has led to significant and similar average degrees of mass-dependent fractionation, F, for all three elements. The average value, about 15 /AMU, corresponds to mass losses of 80-85 percent assuming open-system evaporation of the atoms. We find that Phi-Ni varies as (Phi-Fe) exp n, n approximately equal to 3, perhaps because Ni evaporates more slowly than Fe but faster than FeO, and that Phi-Cr is approximately equal to Phi-Fe for all Phi-Fe.

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