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Kinetics of organic matter degradation, microbial methane generation, and gas hydrate formation in anoxic marine sediments |
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| Authors: | K Wallmann G Aloisi A Obzhirov P Tishchenko |
| Affiliation: | a IFM-GEOMAR Research Center, Wischhofstrasse 1-3, 24148 Kiel, Germany b Laboratoire de Paléoenvironnements et Paléobiosphère, Université Claude Bernard, Lyon I, 2, rue Dubois, F-69622 Villeurbanne cedex, France c Pacific Oceanological Institute (POI), 43, Baltiyskaya Street, 690041 Vladivostok, Russia |
| Abstract: | Seven sediment cores were taken in the Sea of Okhotsk in a south-north transect along the slope of Sakhalin Island. The retrieved anoxic sediments and pore fluids were analyzed for particulate organic carbon (POC), total nitrogen, total sulfur, dissolved sulfate, sulfide, methane, ammonium, iodide, bromide, calcium, and total alkalinity. A novel method was developed to derive sedimentation rates from a steady-state nitrogen mass balance. Rates of organic matter degradation, sulfate reduction, methane turnover, and carbonate precipitation were derived from the data applying a steady-state transport-reaction model. A good fit to the data set was obtained using the following new rate law for organic matter degradation in anoxic sediments: |
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