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Chemical analyses of 22 elements in 27 samples from DSDP Leg 34 cores clarify some of the sedimentological processes operating on the Nazca plate. All sediments analyzed have high transition metal to aluminum ratios typical of metalliferous sediments found near spreading centers. Distinctive compositional differences exist between surficial sediments and basal sediments of Site 319. The elemental abundance patterns and metal accumulation rate data for these two contrasting parts of the core suggest that the basal sediments are dominated by hydrothermal sources of metals, while the hydrogenous precipitation is important in the near-surface sediments. Hole 320B and Site 321 exhibit many of the same compositional patterns; however, the younger sediments of Site 321 reflect an increasingly important detrital sediment component.

Chemical Composition and Metal Accumulation Rates of Metalliferous Sediments from Sites 319, 320, and 321