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Pb isotope compositions were determined on sulfides collected from vent fields on the spreading ridge. On Pb-Pb diagrams, the compositions are within both the MORB field and the least radiogenic part of the NFB basalt domain. Compared with the rather large variation of Pb isotope composition of the NFB basalts, the data indicate a remarkable homogeneity of Pb isotope ratios in the hydrothermal sulfides...