Figure F6. Composition of pore fluids squeezed from carbonates at the base of Site 1039. Strontium isotope ratios from pore waters are indicated by data points and solid line in left panel; dashed line shows the strontium paleoseawater mapped onto the age-depth profile of the sediments. Note that basal pore water trend toward modern seawater composition, with values greater than Miocene seawater, indicating a strong modern seawater component in basement fluids. Similar variations are seen in calcium and strontium concentration data. Pore water chemical profiles from basal sediments at Site 1253 show the same patterns for these and additional tracers (see fig. F20 in Shipboard Scientific Party, 2003).

Figure F6. Composition of pore fluids squeezed from carbonates at the base of Site 1039. Strontium isotope ratios from pore waters are indicated by data points and solid line in left panel; dashed line shows the strontium paleoseawater mapped onto the age-depth profile of the sediments. Note that basal pore water trend toward modern seawater composition, with values greater than Miocene seawater, indicating a strong modern seawater component in basement fluids. Similar variations are seen in calcium and strontium concentration data. Pore water chemical profiles from basal sediments at Site 1253 show the same patterns for these and additional tracers (see fig. F20 in Shipboard Scientific Party, 2003).