Figure F27. Interstitial water geochemical data for Site 1236. Open squares = calcium concentrations. Horizontal lines = lithologic unit boundaries (see "Description of Lithologic Units," in "Lithostratigraphy"). Values below the detection limit (0.1 µM for manganese, 2.2 µM for ammonium, and 0.22 µM for barium) are plotted at zero. Iron concentrations (not plotted) are in almost all samples below the detection limit (0.3 µM). The phosphate detection limit was 0.4 µM. Note that blank corrections for ammonium and barium were significant compared to total measured concentrations, so these profiles should be interpreted with caution. The sediment whole round used to extract the interstitial water sample at 202.3 mcd was taken ~5 cm below the top of a 38-cm-thick ash layer.

Figure F27. Interstitial water geochemical data for Site 1236. Open squares = calcium concentrations. Horizontal lines = lithologic unit boundaries (see "Description of Lithologic Units" in "Lithostratigraphy"). Values below the detection limit (0.1 µM for manganese, 2.2 µM for ammonium, and 0.22 µM for barium) are plotted at zero. Iron concentrations (not plotted) are in almost all samples below the detection limit (0.3 µM). The phosphate detection limit was 0.4 µM. Note that blank corrections for ammonium and barium were significant compared to total measured concentrations, so these profiles should be interpreted with caution. The sediment whole round used to extract the interstitial water sample at 202.3 mcd was taken ~5 cm below the top of a 38-cm-thick ash layer.