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We conducted a combined mineralogical, petrological, and geochemical study of altered basaltic rock samples of the upper oceanic crust from Hole 396B IPOD Leg 46. The hole was drilled on the west flank of the Mid-Atlantic Ridge, in anomaly 5 at about 23°N. The site is located in a sediment pond at a water depth of 4450 meters; 205 meters of pillow lavas intercalated with indurated ooze and one exceptionally thick lava unit (sill or flow?) were drilled (Figure 1). The estimated age of the oldest overlying sediment, which belongs to the Discoaster exilis Zone, is about 13 m.y. or middle Miocene. Let us follow the evolution of a given basaltic lava body or unit, from the time it is emplaced by a submarine eruption, on or close to the sea floor of the ridge, to the time

Petrographical and Geochemical Study of the Low Temperature Submarine Alteration of Basalt from Hole 396B, Leg 46