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Partition geochemical analyses have been carried out on sediment samples from two Leg 70 mounds holes (Holes 506 and 509B) for the elements Fe, Mn, Ca, Mg, Al, Co, Ni, Cu, Zn, and Pb. Significant variations occur in the partitioning of elements in the different lithologies recognized and also with depth in each hole. In particular, amounts of acid-reducible Mn and Fe increase upward in the uppermost 8 to 10 meters of sediment in each hole while acetic-acid soluble Mn increases in the lower half of each hole. The trace metals Co, Ni, Cu, Zn, and Pb show no recognizable patterns of variation with depth. The similarities in element-partition patterns with depth in the two holes studied suggest that similar conditions have been maintained at both sites during mounds formation, and the vertical partition pattern of Mn supports the theory of participation of buried Mn-oxides in nontronite formation.

Partition Geochemistry of Sediments from Holes 506 and 509B, Deep Sea Drilling Project Leg 70