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• W2592382487 endingPage "958" @default.
• W2592382487 startingPage "941" @default.
• W2592382487 abstract "Abstract. Rates and pathways of benthic organic carbon (Corg) oxidation were investigated in surface sediments of the Ulleung Basin (UB) characterized by high Corg contents ( > 2.5 %, dry wt.) and very high contents of Mn oxides ( > 200 µmol cm−3) and Fe oxides (up to 100 µmol cm−3). The combination of geochemical analyses and independently executed metabolic rate measurements revealed that Mn and Fe reduction were the dominant Corg oxidation pathways in the center of the UB, comprising 45 and 20 % of total Corg oxidation, respectively. By contrast, sulfate reduction was the dominant Corg oxidation pathway, accounting for 50 % of total Corg mineralization in sediments of the continental slope. The relative significance of each Corg oxidation pathway matched the depth distribution of the respective electron acceptors. The relative importance of Mn reduction for Corg oxidation displays saturation kinetics with respect to Mn oxide content with a low half-saturation value of 8.6 µmol cm−3, which further implies that Mn reduction can be a dominant Corg oxidation process even in sediments with lower MnO2 content as known from several other locations. This is the first report of a high contribution of manganese reduction to Corg oxidation in offshore sediments on the Asian margin. The high manganese oxide content in the surface sediment in the central UB was maintained by an extreme degree of recycling, with each Mn atom on average being reoxidized ∼ 3800 times before permanent burial. This is the highest degree of recycling so far reported for Mn-rich sediments, and it appears linked to the high benthic mineralization rates resulting from the high Corg content that indicate the UB as a biogeochemical hotspot for turnover of organic matter and nutrient regeneration." @default.
• W2592382487 created "2017-03-16" @default.
• W2592382487 creator A5013095317 @default.
• W2592382487 creator A5022487559 @default.
• W2592382487 creator A5033845712 @default.
• W2592382487 creator A5041745538 @default.
• W2592382487 creator A5057235495 @default.
• W2592382487 creator A5057288476 @default.
• W2592382487 creator A5067286446 @default.
• W2592382487 date "2017-03-01" @default.
• W2592382487 modified "2023-10-17" @default.
• W2592382487 title "Manganese and iron reduction dominate organic carbon oxidation in surface sediments of the deep Ulleung Basin, East Sea" @default.
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