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- W2019651807 abstract "Chemical distributions and microbial culture data are combined to identify the biogeochemical pathways that control the cycles of manganese and iron at the oxic−anoxic transition of the Orca Basin. The redox transition coincides with an increase in salinity from 35 to 260‰; hence, mixing diagrams are used to constrain the salinity ranges over which consumption or production of solute species takes place. Analysis shows that the very high dissolved Mn(II) levels (>400 μM) at intermediate salinities (60−180‰) result from dissimilatory (microbial) reduction of manganese oxides, coupled to organic matter oxidation. The manganese oxides are continuously regenerated in the oxygenated, low-salinity region (45−52‰) by microbial oxidation of dissolved Mn(II). Precipitation of manganese carbonate in the high-salinity zone (>180‰) is the main removal mechanism of Mn to the sediments. Upward diffusing Fe(II) ions are extracted from solution within the anoxic, high-salinity range (230−260‰), through anaerobic oxidation by manganese oxides or a nonoxidative sorption process. Ferric oxyhydroxides are reduced by reaction with dissolved sulfide and are, therefore, not an important terminal electron acceptor for organic matter oxidation. Overall, the acid−base chemistry, redox transformations, and microbial activity across the salinity transition are strongly coupled to the cycle of manganese." @default.
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- W2019651807 date "1998-08-21" @default.
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- W2019651807 title "Biogeochemical Cycles of Manganese and Iron at the Oxic−Anoxic Transition of a Stratified Marine Basin (Orca Basin, Gulf of Mexico)" @default.
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- W2019651807 doi "https://doi.org/10.1021/es980307m" @default.
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