Abstract
ONE stage in sedimentary pyrite formation1–3 is ‘FeS’ + S→ FeS2, where ‘FeS’ represents black precursor sulphides such as amorphous iron sulphides and fine-grained mackinawite (Fe1+xS). We report here a Mossbauer spectral study of the formation of pyrite, in sulphide-rich sediments, from the reaction of H2S with hydrated ferric oxides and with ferrous ions in fine-grained chlorite or in amorphous silicates. Approximately 50% of total Fe deposited is converted to pyrite within a few years, with the remainder being converted over several hundred years. Less than 10% of total Fe is present as precursor sulphides. With suitable constraints in computation, Mossbauer methods show considerable potential for measuring rates of reaction of iron compounds in sediments.
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