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Influence of an Organic-poor Landslide Deposit on the Early Diagenesis of Iron and Manganese in a Coastal Marine Sediment.
Mucci A; Edenborn HM
Geochimica Et Cosmochimica Acta 1992 56:3909-3921
Sediments and pore waters were subsampled from two box cores collected at approximately 135 m depth on the landward slope of the largest basin of the Saguenay Fjord (Quebec, Canada). The Saguenay Fjord sediments are composed mostly of eroded glaciomarine clays surrounding the fjord area. The sediments contain relatively large concentrations of organic carbon and are sulfide a few millimeters below the sediment-water interface. Non-steady state sulfate reduction rates were established due to the nonuniform distribution of organic carbon with depth. Iron sulfide peaks reflect this distribution and the position of the relict redox boundary. A schematic representation of the sequence of diagenetic events that led to the postdepositional remobilization of fe and mn and the migration of the oxidation front following the deposition of the landslide material is proposed.
Geochimica Et Cosmochimica Acta., V. 56, 1992, PP. 3909-3921
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