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Previous basement drilling legs in the Atlantic Ocean (Legs 37, 45, 46, and 49) sampled relatively young crust on the flanks of the Mid-Atlantic Ridge. Drilling on Legs 51, 52, and 53 sampled much older crust, thus providing an opportunity to compare alteration processes in young and old crust and to study variations in magmatic processes and mantle compositions with time. We have investigated the compositional effects of alteration by studying K2O, Rb, and Cs, which are particularly sensitive to low-temperature sea-floor alteration. Magmatic processes and mantle compositions have been monitored by a study of hygromagmaphile elements (low-partition coefficient elements) belonging to the second and third transition series, together with Th.

Trace Elements in Cretaceous Basalts at 25°N in the Atlantic Ocean: Alteration, Mantle Compositions, and Magmatic Processes