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Gabbro, gabbroic anorthosite, basaltic breccia, diabase and basalt samples were dredged from a fracture zone of the Galapagos Rise, a fossil spreading center on the Nazca plate. Serpentinite was dredged from the Ecuador fracture zone of the Galapagos Spreading Center. Although the rocks are variably altered, minerals and chemistry of gabbroic rocks indicate that extensive fractionation occurred throughout the suite. Basaltic breccias have textures indicating prefracture zone brecciation.