Figure F2. Pb-Pb isotope plots. Solid circles = sediment samples from this study, open circles = massive sulfides from the Middle Valley of the north end of the Juan de Fuca Ridge (Cousens et al., 2002). Juan de Fuca/Gorda Ridge basalts field data compiled by Cousens (1996). Juan de Fuca Ridge bare-rock sulfide data from Fouquet and Marcoux (1995) and Hegner and Tatsumoto (1987). Turbidite and surface sediment data from Cousens et al. (2002). Pacific seawater (represented by Mn crust) data from von Blanckenburg et al. (1996). NHRL = Northern Hemisphere Reference Line (Hart, 1984).
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