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Hoehler, Tori M; Borowski, Walter S; Alperin, Marc J; Rodriguez, Nancy M; Paull, Charles K (2000): Pore water methane characteristics and sulphate reduction rates of ODP Leg 164 sediments. PANGAEA, https://doi.org/10.1594/PANGAEA.803662, Supplement to: Hoehler, TM et al. (2000): Model, stable isotope, and radiotracer characterization of anaerobic methane oxidation in gas hydrate-bearing sediments of the Blake Ridge. In: Paull, CK; Matsumoto, R; Wallace, PJ; Dillon, WP (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 164, 1-7, https://doi.org/10.2973/odp.proc.sr.164.242.2000

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Abstract:
Anaerobic methane oxidation (AMO) was characterized in sediment cores from the Blake Ridge collected during Ocean Drilling Program (ODP) Leg 164. Three independent lines of evidence support the occurrence and scale of AMO at Sites 994 and 995. First, concentration depth profiles of methane from Hole 995B exhibit a region of upward concavity suggestive of methane consumption. Diagenetic modeling of the concentration profile indicates a 1.85-m-thick zone of AMO centered at 21.22 mbsf, with a peak rate of 12.4 nM/d. Second, subsurface maxima in tracer-based sulfate reduction rates from Holes 994B and 995B were observed at depths that coincide with the model-predicted AMO zone. The subsurface zone of sulfate reduction was 2 m thick and had a depth integrated rate that compared favorably to that of AMO (1.3 vs. 1.1 nmol/cm**2/d, respectively). These features suggest close coupling of AMO and sulfate reduction in the Blake Ridge sediments. Third, measured d13CH4 values are lightest at the point of peak model-predicted methane oxidation and become increasingly 13C-enriched with decreasing sediment depth, consistent with kinetic isotope fractionation during bacterially mediated methane oxidation. The isotopic data predict a somewhat (60 cm) shallower maximum depth of methane oxidation than do the model and sulfate reduction data.
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Median Latitude: 31.799125 * Median Longitude: -75.528150 * South-bound Latitude: 31.785700 * West-bound Longitude: -75.545700 * North-bound Latitude: 31.803600 * East-bound Longitude: -75.522300
Date/Time Start: 1995-11-08T00:45:00 * Date/Time End: 1995-12-03T11:50:00
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