Fig. 1: Geography and stratigraphy of the study site.
From: Sedimentary pyrite sulfur isotopes track the local dynamics of the Peruvian oxygen minimum zone
a Geographic location map of samples investigated in this study. Location of the Ocean Drilling Program (ODP) site 1229 (green dot) and other cores mentioned in this study. b Stratigraphic section of hole 1229E. Redrawn from ref. 46. c Depth profiles of porewater sulfate (mM), sulfide (mM), and methane (μM) concentrations. Dark and light symbols refer to site 1229 hole A and D, respectively. d Sulfate reduction rate (SRR, in pmol cm–3 d–1), hydrogenotrophic methanogenesis rate (H2 + CO2 MG, in pmol cm–3 d–1), and acetoclastic methanogenesis rate (Ac MG, in pmol cm–3 d–1; from ref. 25), archaeol concentration (g cm–3; from ref. 26,27). e δ34S values preserved in sedimentary pyrite, as measured in this study (dark green dots) and in ref. 28 (light green dots), and location of dolomite layers (from ref. 35) and barite layers (based on Ba/Al ratios). Both near-surface methanogenesis (surface MG; orange band) and the sulfate−methane transition zone (SMTZ, gray band) are indicated.
