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Deep Sea Drilling Project Legs 59 and 60 drilled 15 sites along an east-west transect at 18°N from the West Philippine Basin to the Mariana Trench (Fig. 1) in order to study the nature and genesis of the back-arc, marginal basins and the remnant and active arcs of the region. Leg 59 drilled at five sites at the western end of the traverse: Site 447 in the West Philippine Basin; Site 448 on the Palau-Kyushu Ridge; Sites 449 and 450 in the Parece Vela Basin; and Site 451 on the West Mariana Ridge. Penetration into basaltic basement of these sites was 183.5 meters at 447 (8 basalt flows); 623 meters at 448 (46 basalt flows, sills, and dikes and volcaniclastic units); 40.5 meters at 449 (2 basalt flows); 7 meters at 450 (1 basalt intrusion); and 4 meters of basalt breccia at 451 overlain by 861 meters of volcaniclastic sedimentary rocks. The petrology, mineralogy, and geochemistry of these cores have been described by Mattey et al. (this volume). They have distinguished the main igneous units recovered on the basis of X-ray fluorescence (XRF), whole rock geochemical data, microprobe data for minerals and glasses, and petrography. From these data we have chosen 17 samples which are representative of the main compositional units and subjected them to epithermal neutron activation analysis (Chayla et al., 1973; Jaffrezic et al., in press) to obtain high precision data for a number of trace elements (viz. Sc, Co, Cs, La, Ce, Eu, Tb, Hf, Ta, Th, and U) which could not be obtained by XRF. The core intervals of the 17 samples are given in Table 1 together with a summary of the nature and size of the compositional units from which they are taken. Major and trace element analyses of the samples are given in Table 2. One aim of this study has been to compare the composition of these rocks with those erupted in other tectonic environments to elucidate the chemical characteristics of basaltic crust formed at active plate margins which consist of a series of remnant island arcs and interarc basins. Data for mid-ocean ridge basalts and the lava series of Japan have been particularly useful to us in this respect.

A Geochemical Study of Selected Samples from the Basement Cores Recovered at Sites 447, 448, 449, 450, and 451, Deep Sea Drilling Project Leg 59