Pyrite formation in an anoxic estuarine basin

摘要

In a shallow, fjord-like estuary, the Upper and Lower Basins of the Pettaquamscutt River (Rhode Island) each contain water columns stratified into oxic and anoxic plus sulfidic layers. Both water columns contain iron monosulfides and pyrite from just below the oxic-anoxic interface down to the sediment-water interface. Concentra- tions of iron monosulfides increase with increasing depth in the water columns, but concentrations of pyrite are relatively constant with depth.