Figure 6. A. Strontium isotope ratios from pore water samples from Site 1039 are indicated by the solid line, with the dashed line showing the Sr seawater curve appropriate to the sediment age. Note the basal pore water trend toward modern seawater composition, with values greater than Miocene seawater, indicating a strong seawater component in basement fluids. B. High lithium concentration in pore water samples from the décollement and fluid conduit at Site 1040; see text for discussion of correlative indicators of higher-temperature (>110°-150°C) deeply sourced fluids advecting from depth along the décollement and upper conduit. C. Barium concentration in pore water samples in the uppermost part of the underthrust section from Site 1040; high pore water Ba concentrations from sulfate reduction have not diffused or advected into the décollement, indicating a separate fluid flow regime in the underthrust sediments.