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Sulphate reduction usually leads to the formation and accumulation of authigenic pyrite (FeS 2 ) in organic-rich coastal marine sediments. Iron monosulphides (FeS x ) are most often found as a minor constituent of the reduced sulphur pool in these sediments and are believed to be precursor phases which convert to pyrite during early diagenesis. Abnormally high ratios of acid-volatile...
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