The partitioning of P, Sc, Ti, Sr, Y, Nb, the rare earth elements (REE), Hf, Ta, Th and U between zircon and a synthetic andesitic melt was determined as a function of oxygen fugacity (fO ) over a range of fourteen log units, from QFM-8 to QFM+6 (where QFM is the quartz-fayalite-magnetite oxygen buffer) at ∼1300°C and 1atm, using SIMS and LA-ICP-MS. The partition coefficients of Ce and Eu were found to vary systematically with fO , relative to those of the other REE, producing Ce and Eu anomalies similar to those that are characteristic of natural igneous zircon. These anomalies coexist at terrestrial fO s and were used to quantify Eu /(Eu +Eu ) and Ce /(Ce +Ce ) in the melt. The partition coefficients of the redox invariant trivalent cations are in excellent agreement with lattice strain theory. The values of D are related to those determined for natural samples by the expected dependence on temperature. The incorporation of REE in zircon was independent of the presence of P. D /D was found to vary systematically with fO indicating the presence of U , U and U in the melt at terrestrial conditions. D was independent of fO despite an expectation of significant Ti in the most reduced experiments.