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On a total of 25 basalt samples drilled in Hole 396B (Leg 46) the rare earth elements La, Ce, Sm, Nd, Eu, Tb, Dy, Yb, and Lu and the trace elements Li, F, Sc, V, Cr, Ni, Zn, Sr, and Hf have been determined by INAA and AAS. The data obtained indicate that there are no large-scale differences between basalts from different lithologic units met in this hole. However, minor differences do exist, which are especially pronounced in case of the REE. All basalts analyzed are LREE depleted and exhibit smooth distribution patterns. Basalts from Lithologic Unit 4 differ from those of the other units by a very low overall enrichment of the REE compared to chondrite. The average concentrations of Sc, V, Zn, and Hf are also lowest in this unit, whereas Cr and Ni are highest. The differences are in keeping with petrographie features and can be explained by the special mineralogical composition of these basalts. According to the RE abundances and the concentrations of the other trace elements all rocks investigated can be classified as "typical" mid-ocean ridge basalts. The basaltic magmas are derived from a LREE depleted mantle source; it is assumed, that these magmas have not undergone any large-scale differentiation after their formation.

Abundances of Rare Earths and Other Trace Elements in Leg 46 Basalts (DSDP)