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Secondary minerals in basalts and basaltic breccias from Holes 332A, 332B, 333A, and Site 335 from DSDP Leg 37 provide information about the alteration of the volcanic layer of the oceanic crust. Previous work has stressed changes in bulk rock composition resulting from seawater-rock alteration (e.g., Hart et al., 1974); however, with a few exceptions (e.g., Bass et al., 1973; Bass, 1976), detailed studies of the mineralogical evidence for these changes have not been undertaken. A clear understanding of the alteration processes, and by implication the nature of the geochemical balance between seawater and the oceanic crust (e.g., Hart, 1970; Muehlenbachs and Clayton, 1976) depends on the mineralogical evidence.

Mineralogy and Chemistry of Secondary Phases in Some Basaltic Rocks from DSDP Leg 37