THE INFLUENCE OF PRESSURE AND TEMPERATURE ON THE METAL-SILICATE PARTITION-COEFFICIENTS OF NICKEL AND COBALT IN A MODEL-C1 CHONDRITE AND IMPLICATIONS FOR METAL SEGREGATION IN A DEEP MAGMA OCEAN

The metal-silicate partition coefficients of Ni and Co in a model C1 chondrite were determined at pressures ranging from 1.2 to 12.0 GPa and temperatures between 2123 and 2750 K. At 5.0 GPa and 2500 K, the effect of variable oxygen contents on the partitioning of Ni and Co was also investigated. Graphite was chosen as the sample container. Carbon is an integral part of the system because about 5 wt% C dissolved in the metal liquid.