Figure 7. Strontium isotopic composition of aragonite precipitates (solid circles), pore water (squares), and bivalve shells (open circles). Pore-water samples are from Sites 994, 995, 996, and 997. Seawater data (gray bars) are from Farrell et al. (1995). Age model is based on a constant sedimentation rate of 48 m/m.y. See text for discussion.