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Sulfide globules in mid-ocean ridge basalts (MORBs) from the ultra-slow spreading Southwest Indian Ridge (SWIR) are present in olivine crystals and in the matrix glass, indicating S-saturated fractionation during magmatic evolution. Most of the sulfides were in equilibrium with the magmas based on the Ni contents of the sulfides. The major element trends of MORBs from Zone C (48–51°E) of the SWIR...
Normal mid-ocean ridge basalts (MORBs) from the Southwest Indian Ridge (SWIR) (48°E–64°E) have larger ranges of 187 Os/ 188 Os ratios from 0.1295 to 0.3023 than previously reported N-MORBs. 187 Os/ 188 Os ratios show positive correlations with 1/Os, suggesting possible contamination from a component with higher 187 Os/ 188 Os ratios. Mixing modeling...
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