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    STUDIA GEOLOGIA - Issue no. 1 / 2007  
         
  Article:   OXYGEN AND SULFUR ISOTOPE FRACTIONATION ASSOCIATED WITH PYRITE OXIDATION BY H2O2.

Authors:  LILIANA LEFTICARIU, ARNDT SCHIMMELMANN, LISA M. PRATT.
 
       
         
  Abstract:  Radiolysis of water as a consequence of natural radioactivity and cosmic rays can produce a mixture of strong oxidants, including hydrogen peroxide (H2O2) and hydroxyl radicals (HO*), as well as molecular hydrogen (H2). Subsequent radiationinduced chemical oxidation reactions are particularly significant in geologic environments where the fugacity of molecular oxygen is negligible. Oxidation by radiolytically generated reagents can be observed in modern groundwater associated with uranium ore bodies and can be inferred for ancient groundwaters. Prior to development of an O2-rich atmosphere on Earth, radiolytic oxidants could have reacted with pyrite and provided local sources of partially to fully oxidized sulfur species available for microbial metabolism.  
         
     
         
         
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