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The objective of the present work is to determine the changes in chemical composition of oceanic lavas brought about by their reaction with seawater. The results should have important implications in the interpretation of analyses of submarine lavas in the geological column. The majority of the samples obtained for this study are in three sequential sets in Hole 332B and Site 335 (Figure 1). Each set comprises closely spaced samples that span at least one flow unit; a pillow in the case of Site 335 and probably thin flows for the sets of Hole 332B. A set of two samples from Hole 332A (not shown in Figure 1) represents the rim (7-1, 125 cm) and interior (7-1, 130 cm) of the same pillow. The remaining samples (Figure 1, and two samples from Hole 332A) are mostly pillow rims from a variety of depths. Chemical analyses are presented in Chapters 2 and 5 (this volume). Microprobe analyses (Table 1) are limited to representative samples of the upper set of Hole 332B and the set of Site 335.

The Petrology of Alteration in Three Discrete Flow Units of Sites 332 and 335