We examined 202 thin sections from 199 specimens sampled by J. Maeda and E. Kikawa during Leg 176. These thin sections contain 217 lithologies (Table T1). Ordinary petrographic descriptions were done under the microscope, with special attention to veins composed of high-temperature minerals. Observations made on enlarged photos taken with Minolta F-3000, a film scanner that has an attachment designed for a thin section, were very useful for identification of the veins described here. Microprobe analyses were done at the State University of New York at Binghamton with a JEOL-8900 during the stay of J. Maeda. Microprobe operations and data correction procedures are the same as in Naslund (1995).