Figure F22. Variation of compatible elements Ni, Cr, and Cu during silicate fractionation and late stage-oxide/sulfide fractionation. A. Variation between whole-rock Ni and whole-rock Mg# (100 x [Mg/Mg + Fe]) showing expected decreases in Ni with decreasing Mg#. The depletion trend is from "oxide-free" to "oxide-bearing" to "oxide" gabbros and olivine gabbros. B. Variation between whole-rock Cr and whole-rock Mg#. A strong early depletion trend with Cr decreasing with Mg# from "oxide-free" to "oxide-bearing" to "oxide" gabbros and olivine gabbros. A slight increase in Cr in oxide gabbros could be due to the fact that Cr partitions into oxides, and an accumulation of oxides will lead to an increase in whole-rock Cr. C. Variation between whole-rock Cu and whole-rock Mg#. "Oxide-free" gabbros and olivine gabbros show a decrease in Cu with decreasing Mg#. A gradual to strong increase in Cu is seen in "oxide-bearing" and "oxide" gabbro and olivine gabbro. This increase in Cu is likely due to late sulfide liquids and accumulation of chalcopyrite.