Figure F21. The Na⁺/Cl^- ratio plotted vs. increasing depth for Sites 1129, 1131, and 1127. Note the well-defined increase in the Na⁺/Cl^- ratio in the pore waters at Sites 1129 and 1131 compared to Site 1127. The more pronounced Na⁺/Cl^- ratios at Sites 1129 and 1131 support a continental origin of the brine. The shaded interval indicates the range of Na⁺/Cl^- ratios in seawater.