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Sixty-four determinations of sulfur isotopes were conducted on basalts from the Galapagos Rift (Deep Sea Drilling Project Legs 54 and 70). With a σ mean of -0.3%, primary sulfides reflect the isotopic value of mantle sulfur. The sulfur from sulfate and pyrite shows a wide σ spread from -19.5% to + 9.7%, reflecting such secondary influences as seawater alteration or precipitation of dissolved primary sulfides. There is no relation between the composition of sulfur isotopes and the sulfur content of the basalts. Sulfur content varies between 850 and 1714 ppm for the young FETI-basalts and between 164 and 1030 ppm for the normal tholeiites of the old Galapagos crust. It is correlated positively with iron content; lower amounts of sulfur compared to iron are either caused by a bulk loss of sulfur resulting from remobilization of igneous sulfides or by the fact that the interior of a pillow, as compared to its rim, is depleted in sulfur.

Sulfur and Sulfur Isotope Content of Basalts from the Galapagos Rift (Legs 54 and 70)