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Leg 34 of the Deep Sea Drilling Project cored basaltic basement at three locations within the Nazca plate. Site 319 within the Bauer Deep lies westward of the extinct Galapagos Rise and eastward of the presently active East Pacific Rise. Estimates of basement age are about 15 m.y. (Hart et al., 1974). Sites 320 and 321 lie between the Galapagos Rise and Peru-Chile Trench; Site 320 north and Site 321 south of the Mendaria Fracture Zone. Basement ages at both sites are estimated at 40-45 m.y. Basement samples have been analyzed from Holes 319, 319A, and 320B, and Site 321. Data are reported for Ti, Zr, Y, Sr, Rb, together with petrographic and phase chemistry data for samples taken at intervals down each core. Distribution of analyzed samples is shown in Table 1, and a crude estimate of the relationship of samples to proposed cooling units is shown in Figure 1. Petrographic descriptions of analyzed samples are given in Table 2.

Preliminary Petrology of Leg 34 Basalts from the Nazca Plate