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The S3¨C Ion Is Stable in Geological Fluids at Elevated Temperatures and Pressures
Gleb S. Pokrovski1,* and Leonid S. Dubrovinsky2
+ Author Affiliations

1G¨¦osciences Environnement Toulouse (GET, ex-LMTG), UMR 5563 of CNRS, Universit¨¦ Paul Sabatier, 14, avenue Edouard Belin, F-31400 Toulouse, France.
2Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany.
*To whom correspondence should be addressed. E-mail: gleb.pokrovski@get.obs-mip.fr
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¡ãC and 0.5 gigapascal is the trisulfur ion S3¨C. The large stability range of S3¨C enables efficient transport and concentration of sulfur and gold by geological fluids in deep metamorphic and subduction-zone settings. Furthermore, the formation of S3¨C requires a revision of sulfur isotope¨Cfractionation models between sulfides and sulfates in natural fluids.
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