“…Lead isotopic compositions of seafloor hydrothermal sulfides indicate that the lead is most likely derived from three sources: (1) basalts at MORs (e.g., Brévart et al, 1981;LeHuray et al, 1988;Fouquet and Marcoux, 1995;Zeng et al, 2010); (2) sediments at BABs (e.g., Halbach et al, 1997;Zeng et al, 2000b) and MORs (e.g., LeHuray et al, 1988;Zierenberg et al, 1993;Cousens et al, 2002); (3) volcanic rocks that have inherited lead from the subducted slab, including basalt and its sediment at BABs Kim et al, 2004). On sediment-starved ridges, the Pb in hydrothermal sulfides is considered to have been mobilized from the volcanic crust during hydrothermal circulation based on the sulfide Pb isotope compositions that are indistinguishable from that of the local basalt (e.g., Brévart et al, 1981;Vidal and Clauer, 1981;LeHuray et al, 1988;Fouquet and Marcoux, 1995;Andrieu et al, 1998;Zeng et al, 2010).…”