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Compressional and shear wave velocities have been measured at confining pressures up to 6.0 kbar for a dolostone and a sedimentary breccia from Site 357. Selected elastic properties computed from the velocities and densities are also reported. The dolostone is composed largely of silt-sized dolomite rhombs with significant amounts of micrite and silica cement. The dark greenish-gray breccia is composed of glassy basalt fragments and a few sediment clasts, with a mean grain size of 2-4 mm. The angular to subangular basalt fragments contain many calcite-filled vesicles and abundant microcrystalline Plagioclase and pyroxene. A few larger pyroxene crystals are also present in the basalt and in the matrix, which appears to be composed of silica, clay, and calcite. In addition, compressional wave velocities were measured at confining pressures up to 1.0 kbar in samples cut parallel and perpendicular to the drill core axes of 11 zero sections. Porosities and wet bulk densities were also determined. These samples are highly calcareous, ranging from chalk to limestone, and all display significant velocity anisotropy with the high velocities in the horizontal direction.

Velocity Anisotropy and Physical Properties of Deep-sea Sediments from the Western South Atlantic