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Journal articles

The S3- Ion Is Stable in Geological Fluids at Elevated Temperatures and Pressures

Abstract : The chemical speciation of sulfur in geological fluids is a controlling factor in a number of processes on Earth. The two major chemical forms of sulfur in crustal fluids over a wide range of temperature and pressure are believed to be sulfate and sulfide; however, we use in situ Raman spectroscopy to show that the dominant stable form of sulfur in aqueous solution above 250°C and 0.5 gigapascal is the trisulfur ion S3-. The large stability range of S3- enables efficient transport and concentration of sulfur and gold by geological fluids in deep metamorphic and subduction-zone settings. Furthermore, the formation of S3- requires a revision of sulfur isotope-fractionation models between sulfides and sulfates in natural fluids.
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Gleb S. Pokrovski, Leonid S. Dubrovinsky. The S3- Ion Is Stable in Geological Fluids at Elevated Temperatures and Pressures. Science, 2011, 331, pp.1052. ⟨10.1126/science.1199911⟩. ⟨insu-03620194⟩



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