Sulfur in peat forming systems of the okefenokee swamp and florida everglades usa origins of sulfur in coal

Casagrande, D.J.; Siefert, K.; Berschinski, C.; Sutton, N.

Geochimica et Cosmochimica Acta 41(1): 161-167


ISSN/ISBN: 0016-7037
Accession: 006541254

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Six S forms were investigated in profiles of freshwater- and marine-derived peat-forming systems of the Okefenokee Swamp, Georgia and Everglades Swamp, Florida, [USA]. Total S levels of 0.1-10% were found, indicating a major incorporation of S in the very early stages of coal formation. The quantities of H2S and elemental S indicated whether marine or freshwater conditions prevailed at the site of deposition. C-bonded S accounted for 70% of the total S in the freshwater peat and 50% of the total S in the marine peat. Over 15% of the total S was in pyritic combination in the marine environment, while levels of pyrite in the freshwater peats were an order of magnitude lower. An ester-sulfate fraction represented 25% of the total S in both freshwater and marine peats. The levels of S forms in the peat profiles were compared to those in living plants and various coals; levels of pyrite and organic S in the peat were similar to those in freshwater-derived and marine-derived coals.