Kinetics of organic matter degradation, microbial methane generation, and gas hydrate formation in anoxic marine sediments
International audience 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, meth...
Published in: | Geochimica et Cosmochimica Acta |
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Online Access: | https://hal.archives-ouvertes.fr/hal-00141526 https://doi.org/10.1016/j.gca.2006.06.003 |
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ftccsdartic:oai:HAL:hal-00141526v1 2023-05-15T18:09:17+02:00 Kinetics of organic matter degradation, microbial methane generation, and gas hydrate formation in anoxic marine sediments Wallmann, Klaus Aloisi, Giovanni Haeckel, M. Obzhirov, A. Pavlova, G. Tishchenko, P. Leibniz-Institut für Meereswissenschaften (IFM-GEOMAR) PaleoEnvironnements et PaleobioSphere (PEPS) Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) 2006 https://hal.archives-ouvertes.fr/hal-00141526 https://doi.org/10.1016/j.gca.2006.06.003 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gca.2006.06.003 hal-00141526 https://hal.archives-ouvertes.fr/hal-00141526 doi:10.1016/j.gca.2006.06.003 ISSN: 0016-7037 EISSN: 0016-7037 Geochimica et Cosmochimica Acta https://hal.archives-ouvertes.fr/hal-00141526 Geochimica et Cosmochimica Acta, Elsevier, 2006, 70, pp.3905-3927. ⟨10.1016/j.gca.2006.06.003⟩ [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology info:eu-repo/semantics/article Journal articles 2006 ftccsdartic https://doi.org/10.1016/j.gca.2006.06.003 2021-10-24T22:25:56Z International audience 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: RPOC = _______________Kc____________ . Kx.POC C (DIC) + C (CH4) + Kc The rate of particulate organic carbon degradation (RPOC) was found to depend on the POC concentration, an age-dependent kinetic constant (kx) and the concentration of dissolved metabolites. Rates are inhibited at high dissolved inorganic carbon (DIC) and dissolved methane (CH4) concentrations. The best fit to the data was obtained applying an inhibition constant KC of 35 ±5 mM. The modeling further showed that bromide and iodide are preferentially released during organic matter degradation in anoxic sediments. Carbonate precipitation is driven by the anaerobic oxidation of methane (AOM) and removes one third of the carbonate alkalinity generated via AOM. The new model of organic matter degradation was further tested and extended to simulate the accumulation of gas hydrates at Blake Ridge. A good fit to the available POC, total nitrogen, dissolved ammonium, bromide, iodide and sulfate data was obtained confirming that the new model can be used to simulate organic matter degradation and methane production over the entire hydrate stability zone (HSZ). The modeling revealed that most of the gas hydrates accumulating in Blake Ridge sediments are neither formed by organic matter degradation ... Article in Journal/Newspaper Sakhalin Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Okhotsk Geochimica et Cosmochimica Acta 70 15 3905 3927 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology |
spellingShingle |
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology Wallmann, Klaus Aloisi, Giovanni Haeckel, M. Obzhirov, A. Pavlova, G. Tishchenko, P. Kinetics of organic matter degradation, microbial methane generation, and gas hydrate formation in anoxic marine sediments |
topic_facet |
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology |
description |
International audience 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: RPOC = _______________Kc____________ . Kx.POC C (DIC) + C (CH4) + Kc The rate of particulate organic carbon degradation (RPOC) was found to depend on the POC concentration, an age-dependent kinetic constant (kx) and the concentration of dissolved metabolites. Rates are inhibited at high dissolved inorganic carbon (DIC) and dissolved methane (CH4) concentrations. The best fit to the data was obtained applying an inhibition constant KC of 35 ±5 mM. The modeling further showed that bromide and iodide are preferentially released during organic matter degradation in anoxic sediments. Carbonate precipitation is driven by the anaerobic oxidation of methane (AOM) and removes one third of the carbonate alkalinity generated via AOM. The new model of organic matter degradation was further tested and extended to simulate the accumulation of gas hydrates at Blake Ridge. A good fit to the available POC, total nitrogen, dissolved ammonium, bromide, iodide and sulfate data was obtained confirming that the new model can be used to simulate organic matter degradation and methane production over the entire hydrate stability zone (HSZ). The modeling revealed that most of the gas hydrates accumulating in Blake Ridge sediments are neither formed by organic matter degradation ... |
author2 |
Leibniz-Institut für Meereswissenschaften (IFM-GEOMAR) PaleoEnvironnements et PaleobioSphere (PEPS) Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Wallmann, Klaus Aloisi, Giovanni Haeckel, M. Obzhirov, A. Pavlova, G. Tishchenko, P. |
author_facet |
Wallmann, Klaus Aloisi, Giovanni Haeckel, M. Obzhirov, A. Pavlova, G. Tishchenko, P. |
author_sort |
Wallmann, Klaus |
title |
Kinetics of organic matter degradation, microbial methane generation, and gas hydrate formation in anoxic marine sediments |
title_short |
Kinetics of organic matter degradation, microbial methane generation, and gas hydrate formation in anoxic marine sediments |
title_full |
Kinetics of organic matter degradation, microbial methane generation, and gas hydrate formation in anoxic marine sediments |
title_fullStr |
Kinetics of organic matter degradation, microbial methane generation, and gas hydrate formation in anoxic marine sediments |
title_full_unstemmed |
Kinetics of organic matter degradation, microbial methane generation, and gas hydrate formation in anoxic marine sediments |
title_sort |
kinetics of organic matter degradation, microbial methane generation, and gas hydrate formation in anoxic marine sediments |
publisher |
HAL CCSD |
publishDate |
2006 |
url |
https://hal.archives-ouvertes.fr/hal-00141526 https://doi.org/10.1016/j.gca.2006.06.003 |
geographic |
Okhotsk |
geographic_facet |
Okhotsk |
genre |
Sakhalin |
genre_facet |
Sakhalin |
op_source |
ISSN: 0016-7037 EISSN: 0016-7037 Geochimica et Cosmochimica Acta https://hal.archives-ouvertes.fr/hal-00141526 Geochimica et Cosmochimica Acta, Elsevier, 2006, 70, pp.3905-3927. ⟨10.1016/j.gca.2006.06.003⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gca.2006.06.003 hal-00141526 https://hal.archives-ouvertes.fr/hal-00141526 doi:10.1016/j.gca.2006.06.003 |
op_doi |
https://doi.org/10.1016/j.gca.2006.06.003 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
70 |
container_issue |
15 |
container_start_page |
3905 |
op_container_end_page |
3927 |
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1766181761626144768 |