Geochemical and isotopic study of sediment from Unit I, DSDP site 270, Ross Sea. [Sr-87/Sr-86]

As part of a study of the chemical composition and strontium isotopic composition of sediment deposited in the Ross Sea of Antarctica, samples from unit 1 of Deep Sea Drilling Project (DSDP) site 270 were analyzed. The site is located at 77/sup 0/26.48'S. 178/sup 0/30.19'W. It was found that the strontium-87/strontium-86 ratios of the noncarbonate fractions of the sediment increase linearly with the reciprocals of the strontium concentration. This relationship indicates that the sediment is a mixture of two components having differing strontium-87/strontium-86 ratios and strontium concentrations. Analytical results are presented. (JGB)