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Site 334 was drilled on a steep east-facing slope in a small deep basin at 37°2.13'N, 34°24.87'W. This site lies west of the median valley of the French-American Mid-Ocean Undersea Study area of the Mid-Atlantic Ridge and southwest of the Azores. Acoustic basement lies beneath 259.5 meters of Recent to late Miocene ooze. The drilled basement consists of an upper 50-meter section of largely aphyric basalts and a lower 67 meters consisting of a complex interlayered sequence of gabbroic and serpentinized peridotite rocks. The rock types found in this unexpectedly high level plutonic series comprise coarse gabbros, serpentinized olivine gabbros, serpentinized plagioclase peridotites, and sedimentary and tectonic breccias. A brief summary of the main petrological features of the 10 rock specimens investigated (in order of depth) is given in Table 1. The unaltered silicate phases and spinel group minerals in 10 specimens from the plutonic complex have been analyzed by electron microprobe, and the results are shown in Tables 2-7. Where feldspar and pyroxene phases occur, core and rim analyses have been made to detect zoning. The compositions of the fine exsolution lamellae developed in many of the analyzed pyroxenes could not be determined. Phases showing strong alteration and sulfide minerals have not been analyzed.

Phase Chemistry Studies on Gabbro and Peridotite Rocks from Site 334, DSDP Leg 37