Figure 4 : Comparison of the vertical distribution of trace metals in the oceanic water column in the modern oxic ocean and the Cariaco Trench. A. Iron (N. Pacific: Gordon et al., 1982). B. Copper (N. Pacific: Bruland, 1980). C. Cadmium (N. Pacific Bruland, 1980). D. Manganese (N. Pacific: Martin & Knauer, 1984). All data for the Cariaco Trench are from Jacobs et al., 1987.