Based on trace element abundances and ratios, the igneous basement in Holes 1256C and 1256D is N-MORB composition. The massive ponded flow in Hole 1256D (Unit 1256D-1) is distinct in REE abundance from flows deeper in the section, and there is a notable decrease in concentrations of all elements measured (except Pb, U, Sr, and Sc) from the base of the ponded flow in Hole 1256D to the unit immediately below the ponded flow. REE patterns for samples of basement throughout Hole 1256C are similar to those of Unit 1256D-1. The highly altered interval has significantly higher concentrations of Cs, Rb, and Ba and lower concentrations of Sr, Pb, Zr, Hf, Sc, and most REE than the samples of background alteration or halos. There are no obvious correlations of trace element abundance and macroscopic type of alteration within the samples of background alteration or halos.