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A smectite group mineral, mica, calcite, and pyrite are the dominant secondary minerals associated with the alteration of basalts cored at Site 321, DSDP Leg 34. The smectite has a partial trioctahedral character and is enriched in Fe2U3, MgO, and K2O, while depleted in AI2O3, Tiθ2, and CaO relative to the host basalt. The mica is dioctahedral and based on X-ray characteristics also appears to be rich in Fe2θ3 and MgO, while low in AI2O3. Isotopic evidence, as well as the absence of anhydrite and presence of late Eocene coccoliths, strongly suggest that the secondary minerals formed in response to cold seawater circulating through veins and fractures.

Alteration and Vein Formation in Site 321 Basalts