Figure 11. Depth profiles for calcium (open and solid circles) and magnesium (open and solid squares), strontium, and total alkalinity in Site 1001 interstitial waters. The stratigraphic position of a major unconformity (see text and Sigurdsson, Leckie, Acton, et al., 1997, for details) and the basaltic basement are indicated. The arrows indicate mean ocean bottom-water concentrations for each of the four species. The two symbols (open and solid) used in the calcium and magnesium profiles reflect the incorporation of data from two holes at Site 1001.