The Ni contents of glasses in products of earlier experiments on the Ni partition between olivine and immiscible sulfide liquid have been determined, allowing the distribution coefficients for Ni Fe2+ exchange between sulfide and silicate (KD 1), and olivine and silicate (KD 2) to be calculated. Ni is relatively enriched in S-bearing Mg-silicate liquids by complexing with dissolved S. In consequence, KD 1 and KD 2 are systematically dependent on both silicate liquid and sulfide liquid composition. The present study re-affirms the reliability of the existing Ni partition data for coexisting olivine and sulfide and, therefore, supports the earlier conclusion that an immiscible sulfide liquid cannot be a normal product of upper-mantle magmatic processes. In S-bearing systems KD 2 will be somewhat lower than the value for the corresponding S-free system, and this may account for the discrepancies between previously reported partition data.
ASJC Scopus subject areas
- Geochemistry and Petrology