Fig. 3: Geochemical modeling and microbial evidence show that a high sulfate reduction rate is associated with low fraction of FeR-OC in TOC (fFeR-OC) in the SMTZ of QDN-14B.
From: Cycling and persistence of iron-bound organic carbon in subseafloor sediments
a Measured (red dots) and fitted (black line) sulfate concentrations. A 5-point Gaussian filter was applied to the concentration with the weighting on the 5 points of: [0.06, 0.24, 0.4, 0.24, 0.06]65. The measured data are from Niu et al.28 and Hu et al.60. b Modeled net reaction rate profile of sulfate. Negative values indicate net consumption, and positive values indicate net production. The 1σ envelope is shown in dashed line (See Methods for details). c Downcore record of fFeR-OC. d Downcore record of δ13CFeR-OC. e Relative abundance of Desulfobacterota in bacteria, to which most of the sulfate-reducing bacteria belong78 (data from Niu et al.28). f The cell number of Desulfobacterota, translated from the cell number of bacteria by multiplying the relative abundance of Desulfobacterota in bacteria (data from Niu et al.28). g The copy number of mcrA gene (data from Niu et al.28). The gray bar shows the position of the SMTZ. Source data are provided as a Source Data file.
