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The oxygen isotopic composition of pore waters squeezed from sediments in Hole 817C co-varies with the oxygen isotopic composition of Globigerinoides ruber below 8 mbsf. The magnitude of the variation in the pore water δ O is approximately 30% of the variation in the foraminifers. Overall, the δ O of the pore waters increases down the core, a trend that is also present in the Cl" concentrations. The variations in the δ 1 8 θ of pore waters may be the result of either of two phenomena. First, these may reflect original variations in the waters, the magnitude of which has been subsequently reduced by process of diffusion. Second, these may reflect recrystallization of the precursor sediment and isotopic exchange between the fluids and the recrystallized sediment. At the moment data are not available to ascertain which process is responsible although the correlation between the Cl" and the δ 1 8 θ data suggests that these values reflect the original composition modified by diffusion.

Comparisons between the Oxygen Isotopic Composition of Pore Water and Globigerinoides ruber in Sediments from Hole 817C