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Basalt samples collected on DSDP Leg 54 are fresh, with some showing extensive Feand Ti-enrichment. Samples from many sites were contaminated with Co, Ta, and, to a lesser extent, Nb, because they were powdered using a tungsten carbide shatter box onboard ship. Y/Tb, Zr/Hf, and (for uncontaminated samples) Nb/Ta ratios are similar to those of North Atlantic basalts and chondritic meteorites; these ratios are probably characteristic of the primordial mantle. The La/Ta and Y/La ratios indicate that the Leg 54 eastern Pacific basalts were derived from "depleted" mantle similar to the source of North Atlantic basalts drilled on DSDP Leg 45 (22°N; Miocene crust) and Legs 51 through 53 (25°N; Cretaceous crust).

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East Pacific Rise, Galapagos Spreading Center and Siqueiros Fracture Zone, Deep Sea Drilling Project Leg 54: Hygromagmaphile Elementsa Comparison with the North Atlantic

East Pacific Rise, Galapagos Spreading Center and Siqueiros Fracture Zone, Deep Sea Drilling Project Leg 54: Hygromagmaphile Elementsa Comparison with the North Atlantic

East Pacific Rise, Galapagos Spreading Center and Siqueiros Fracture Zone, Deep Sea Drilling Project Leg 54: Hygromagmaphile Elementsa Comparison with the North Atlantic