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Compressional (Vp) and shear (Vs) wave velocities have been measured in the laboratory under conditions of hydrostatic confining pressure to 6.0 kbar through 15 samples of basalt recovered during DSDP Leg 34 from Sites 319,320, and 321 on the Nazca plate. All velocities were determined using the pulse transmission technique through water-saturated samples maintained at pore pressures much lower than confining pressure. The purpose of this investigation is to determine the velocities and elastic properties of samples from the upper levels of layer 2 in the Nazca plate under conditions of confining pressure and water saturation appropriate to the sea floor for eventual comparison with refraction data, and to determine from thin section analysis the causes of variations among these properties from site to site and with depth at any given site. Basalts recovered from Holes 319 and 319A, the youngest site drilled on Leg 34 (14 m.y.), are relatively fresh, but vary irregularly in grain size, texture, and degree of alteration with depth. The shallowest samples, 319-13-1, 52-55 cm and 319A-l-l, 32-35 cm, consist, respectively, of fine-grained basalt with variolitic texture and mediumto coarse-grained basalt with variolitic to subophitic texture. Both display minimal alteration. Samples 319A-2-3, 46-48 cm; 319A-3-2, 114-117 cm; and 319A-3-4, 85-88 cm, listed in order of increasing depth, consist of medium-grained diabase with ophitic texture. The two uppermost diabase samples display minor alteration decreasing with depth. The lowermost diabase examined, Sample 319A-14-1, 137-140 cm, displays a fine-grained subophitic texture with minor alteration. All of the diabase samples, except 319A-3-4, 85-88 cm, contain a small number of bent pyroxene grains. Sample 319A-5-1, 80-83 cm, immediately below the diabases, consists of fresh, coarse-grained basalt with subvariolitic to subophitic texture. The two deepest samples examined, 319A-6-1, 145-146 cm and 319A-7-1, 65-68 cm, consist. respectively, of fineto medium-grained basalt with trachytic, subvariolitic to intersertal texture, and coarse-grained basalt with subvariolitic to subophitic texture. Both are slightly altered, with alteration increasing downward. The basalts recovered from Hole 320B (28 m.y.) are uniformly fine grained. but vary in texture and degree of alteration with depth. The uppermost sample, 320B-3-1, 64-67 cm, is an altered, microporphyritic, vesicular

Sonic Velocities and Densities of Basalts from the Nazca Plate, DSDP Leg 34