Figure F38. Chemistry of borehole fluids from Holes 504B and 1256D compared to sampling depth. Fluids were sampled from the deepest point of the hole before the beginning of drilling operations during Legs 83, 111, and 137 (solid triangles = Hole 504B) and Expedition 309 (open diamonds = Hole 1256D). Measured ocean bottom seawater chemistry and estimated uppermost basement fluid composition are shown for both sites.
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