Fujiwara, T., Lin, J., Matsumoto, T., Kelemen, P.B., Tucholke, B.E., and Casey, J., 2003. Crustal evolution of the Mid-Atlantic Ridge near the Fifteen-Twenty Fracture Zone in the last 5 Ma. Geochem. Geophys. Geosyst., 4:10.1029/2002GC000364.