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Interstitial waters from four sites of the Japan Sea (794 to 797) have been analyzed for stable isotopes (δ D, δ n B , δ 1 8 θ , and δS) and Sr/Sr, besides major and minor ions. The isotopic composition is dominated by organic matter degradation, alteration of ash layers and volcaniclastic sands, silica transformation (opal A/CT), and basement alteration. Organic matter degradation and corresponding sulfate reduction leads to 3 S depletion and is dependent upon sedimentation rate. The remaining sulfate reservoir is characterized by very "heavy" δ S ratios, up to +93 o/00 (rel. CDT = Canyon Diabolo Troilite). "Barite fronts," which may develop in such sediments, should also be characterized by very "heavy" sulfur isotopes. The alteration of volcaniclastic material in the Quaternary sections influences the δ 1 8 θ (-1.5 o/oo shift) and δ n B (desorption and later adsorption of "labile" n B). A pronounced positive δ n B anomaly at Site 795 represents the depth range of preferential B uptake by alteration products of the ash layers. At Site 796 δ D, δ *B, and Sr/Sr are severely affected by alteration processes of volcaniclastic sands. The opal A/CT transformation may influence the oxygen isotopes and serves as a potential source for B, which is liberated at this interval at Site 795. This positive B anomaly is not reflected in the δ π B profile. Basement alteration processes dominate the sedimentary sequence below the opal A/CT transition, which serves as a chemical and physical boundary. The decreases in δ D and δ 1 8 θ are probably related to a "paleo ocean water reservoir" situated in the permeable Layer II of the oceanic crust, as is indicated by the positive correlation between these two parameters. Besides Mg, alkalies and δ 1 8 θ basement rocks also serve as a sink for π B (Site 795) and are the source for the Ca and Sr increases, as is documented by the less radiogenic Sr/Sr ratio. Sr/Sr ratios for the lowermost pore waters from Site 795 (0.70529) are comparable to those from volcaniclastic rocks from the "Green Tuff' region (0.704 to 0.706) and oil field brines from the Niigata Oil Field.

Stable and Radiogenic Isotopes in Pore Waters from Leg 127, Japan Sea