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Interstitial water samples from Leg 86 were analyzed for Cl ~, SO 4 2 ~, C a 2 + , Mg + , K + , L i + , Sr + , M n 2 + , Si, N O 3 ~ , N H 4 + , and δ 1 8 θ . The principal findings are as follows. (1) The chloride profiles consistently show a ~ 1 . 5 % downcore increase to about 40 m sub-bottom depth. This increase is consistent with model profiles generated by considering the effects of variations in seawater salinity resulting from Pleistocene glaciation on pore-water composition. δ 1 8 θ profiles support this model. This agreement of model and observation precludes advection of the pore fluids at rates greater than 1 mm/yr. (2) C a 2 + and Mg 2 + gradients are small relative to other Deep Sea Drilling Project sites, likely resulting from low diffusive fluxes through underlying chert horizons. (3) Other constituents exhibit profiles consistent with previous observations.

The Chemistry of Interstitial Waters, Deep Sea Drilling Project Leg 86