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Volcanic rocks recovered during Legs 143 and 144 on the Allison, Resolution, Lo-En, Wodejebato, and MIT guyots belong to intraplate alkaline basalts. The basalts are strongly altered by hydrothermal processes, and some are affected by subaerial weathering. The low-temperature hydrothermal alteration, which is best represented in inner parts of sills on the Allison Guyot, led mainly to the formation of smectite, swelling chlorite, mixed-layer smectite-chlorite, and carbonates. Kaolinite, smectite, and hematite dominate among the subaerial weathering products of basalts on the Resolution Guyot and occur in the outer zones of sills on the Allison Guyot. The basalts from the Lo-En, Wodejebato, and MIT guyots have undergone low-temperature smectitization. Formation of mixed-layer smectite-chlorite and seΦentine is a result of high magnesium content in the primary basalt rather than of higher temperature.

Alteration of Basalts from the West Pacific Guyots, Legs 143 and 144