Geological, geochemical, and microbial processes at the hydrate-bearing Håkon Mosby mud volcano: a review

Abstract Submarine mud volcanoes are point sources of fluid expulsion and oases of active geological, geochemical, and microbial processes in the deep ocean. The results of multidisciplinary investigations at the Hakon Mosby mud volcano (HMMV) in the Norwegian Sea at ∼1250 m water depth are reviewed in this paper. Seafloor morphology, lithotypes, geochemical, and biological processes at the HMMV are concentrically zoned. The zonation is controlled by ejection of sediment, water, and gases (mainly methane) accompanied by high heat flow in the mud volcano crater. A structural gas hydrate accumulation is associated with the HMMV. Gas hydrate is abundant only in a relatively narrow zone where optimal conditions (low temperature and high gas concentration) exist for gas hydrate crystallization. Authigenic minerals, bacterial mats, and chemosynthetic communities typical of cold seep environments are present. Rapid anaerobic sulfate-dependant oxidation of methane is thought to be mediated by a consortium of methanogens and sulfate-reducing bacteria. Although methane is oxidized in sediments at high rates, a significant portion of this gas may escape into the ocean, mainly as diffuse flux. In the water column, methane is rapidly dissolved and oxidized. This observation supports the hypothesis that gas flux from deep-water mud volcanoes contributes to the oceanic carbon pool, but not to the atmosphere. The HMMV represents an important natural laboratory and provides insight to processes at the interface of methane-rich sediments and cold bottom water in the deep ocean. Future studies may best focus on accurate direct measurements of gas flux and quantification of the biogeochemical cycling of major chemical elements in shallow sediment.

[1]  Alexei V. Milkov,et al.  Haakon Mosby Mud Volcano provides unusual example of venting , 1997 .

[2]  I. MacDonald,et al.  Pulsed oil discharge from a mud volcano , 2000 .

[3]  J. Laberg,et al.  THE NORWEGIAN–GREENLAND SEA CONTINENTAL MARGINS: MORPHOLOGY AND LATE QUATERNARY SEDIMENTARY PROCESSES AND ENVIRONMENT , 1998 .

[4]  Peter R. Vogt,et al.  Sea-floor terrains of Håkon Mosby Mud Volcano as surveyed by deep-tow video and still photography , 1999 .

[5]  Pierre Henry,et al.  Chemical and isotopic evidence for sources of fluids in a mud volcano field seaward of the Barbados accretionary wedge , 1996 .

[6]  R. Sassen,et al.  Lipid and carbon isotopic evidence of methane-oxidizing and sulfate-reducing bacteria in association with gas hydrates from the Gulf of Mexico , 2002 .

[7]  Olaf Pfannkuche,et al.  A marine microbial consortium apparently mediating anaerobic oxidation of methane , 2000, Nature.

[8]  G. Etiope,et al.  Methane emission from the mud volcanoes of Sicily (Italy) , 2002 .

[9]  K. Nealson,et al.  Bacteria and ArchaeaPhysically Associated with Gulf of Mexico Gas Hydrates , 2001, Applied and Environmental Microbiology.

[10]  H. Roberts,et al.  Hydrocarbon-derived carbonate buildups of the northern Gulf of Mexico continental slope: A review of submersible investigations , 1994 .

[11]  L. F. Ivanhoe,et al.  Global oil, gas fields, sizes tallied, analyzed , 1993 .

[12]  I. Lerche,et al.  Impact of Natural Hazards on Oil and Gas Extraction: The South Caspian Basin , 1999 .

[13]  J. Lelieveld,et al.  Human Impacts on Atmospheric Chemistry , 2001 .

[14]  J. Murrell,et al.  Microbial growth on C[1] compounds , 1993 .

[15]  J. Greinert,et al.  Sea Floor Methane Hydrates at Hydrate Ridge, Cascadia Margin , 2001 .

[16]  K. Olu,et al.  Biogeography, biodiversity and fluid dependence of deep-sea cold-seep communities at active and passive margins , 1998 .

[17]  R. Pancost,et al.  Biomarker Evidence for Widespread Anaerobic Methane Oxidation in Mediterranean Sediments by a Consortium of Methanogenic Archaea and Bacteria , 2000, Applied and Environmental Microbiology.

[18]  P. Aharon,et al.  Origin and Depositional Model of Barite Deposits Associated with Hydrocarbon Seeps on the Gulf of Mexico Slope Offshore Louisiana , 1997 .

[19]  E. Delong,et al.  Methane-Consuming Archaea Revealed by Directly Coupled Isotopic and Phylogenetic Analysis , 2001, Science.

[20]  H. Schulz,et al.  Authigenic carbonates derived from oxidized methane vented from the Makran accretionary prism off Pakistan , 1996 .

[21]  G. Aloisi,et al.  Methane-related authigenic carbonates of eastern Mediterranean Sea mud volcanoes and their possible relation to gas hydrate destabilisation , 2000 .

[22]  A. Zehnder,et al.  Methane formation and methane oxidation by methanogenic bacteria , 1979, Journal of bacteriology.

[23]  Peter R. Vogt,et al.  The Norwegian–Barents–Svalbard (NBS) continental margin: Introducing a natural laboratory of mass wasting, hydrates, and ascent of sediment, pore water, and methane , 1999 .

[24]  Roman V. Smirnov,et al.  Two new species of Pogonophora from the arctic mud volcano off northwestern Norway , 2000 .

[25]  M. Hovland.  Are There Commercial Deposits of Methane Hydrates in Ocean Sediments? , 2000 .

[26]  Olav Eldholm,et al.  Regional setting of Håkon Mosby Mud Volcano, SW Barents Sea margin , 1999 .

[27]  D. Valentine,et al.  Water column methane oxidation adjacent to an area of active hydrate dissociation, Eel river Basin , 2001 .

[28]  B. Hjelstuen,et al.  Late Cenozoic evolution of the western Barents Sea-Svalbard continental margin , 1996 .

[29]  J. Peckmann,et al.  Methane-derived carbonates and authigenic pyrite from the northwestern Black Sea , 2001 .

[30]  A. S. Savvichev,et al.  Microbiological Processes of the Carbon and Sulfur Cycles at Cold Methane Seeps of the North Atlantic , 2000, Microbiology.

[31]  V. A. Soloviev,et al.  Gas hydrate accumulation at the Håkon Mosby Mud Volcano , 1999 .

[32]  Peter G. Brewer,et al.  Methane-consuming archaebacteria in marine sediments , 1999, Nature.

[33]  Tori M. Hoehler,et al.  Field and laboratory studies of methane oxidation in an anoxic marine sediment: Evidence for a methanogen‐sulfate reducer consortium , 1994 .

[34]  J. Laberg,et al.  A Late Pleistocene submarine slide on the Bear Island Trough Mouth Fan , 1993 .

[35]  D. Valentine,et al.  New perspectives on anaerobic methane oxidation. , 2000, Environmental microbiology.

[36]  R. Bidigare,et al.  Gulf of Mexico hydrocarbon seep communities , 1989 .

[37]  E. Lundin,et al.  Mid-Cenozoic post-breakup deformation in the ‘passive’ margins bordering the Norwegian–Greenland Sea , 2002 .

[38]  J. Faleide,et al.  Cenozoic sedimentation along the southwestern Barents Sea margin in relation to uplift and erosion of the shelf , 1996 .

[39]  J. Laberg,et al.  The Middle and Late Pleistocence evolution and the Bear Island Trough Mouth Fan , 1996 .

[40]  L. Dimitrov,et al.  Mud volcanoes—the most important pathway for degassing deeply buried sediments , 2002 .

[41]  Harry H. Roberts,et al.  Massive vein-filling gas hydrate: relation to ongoing gas migration from the deep subsurface in the Gulf of Mexico , 2001 .

[42]  Stefan Schouten,et al.  Evidence for anaerobic methane oxidation by archaea in euxinic waters of the Black Sea , 2001 .

[43]  A. V. Egorov,et al.  Gas hydrates that outcrop on the sea floor: stability models , 1999 .

[44]  H. Roberts,et al.  Evidence of episodic fluid, gas, and sediment venting on the northern Gulf of Mexico continental slope , 1997 .

[45]  A. V. Egorov,et al.  Chemical and isotopic evidence for the nature of the fluid in CH4-containing sediments of the Håkon Mosby Mud Volcano , 1999 .

[46]  Alexei V. Milkov,et al.  Economic geology of offshore gas hydrate accumulations and provinces , 2002 .

[47]  Michael J. Whiticar,et al.  Carbon and hydrogen isotope systematics of bacterial formation and oxidation of methane , 1999 .

[48]  J. Greinert,et al.  Archaea mediating anaerobic methane oxidation in deep-sea sediments at cold seeps of the eastern Aleutian subduction zone , 2000 .

[49]  A. I. Gorshkov,et al.  Authigenic carbonates in methane seeps from the Norwegian sea: Mineralogy, geochemistry, and genesis , 2000 .

[50]  G. Westbrook,et al.  Geophysical survey of a mud volcano seaward of the Barbados Ridge Accretionary Complex , 1988 .

[51]  V. Krupskaya,et al.  Specific Compositional Features of Sediments from the Haakon Mosby Mud Volcano, Southwestern Barents Sea , 2002 .

[52]  Carolyn A. Koh,et al.  Clathrate hydrates of natural gases , 1990 .

[53]  Alexei V. Milkov,et al.  Thermogenic gas hydrates and hydrocarbon gases in complex chemosynthetic communities, Gulf of Mexico continental slope , 1999 .

[54]  P. Vogt,et al.  SW Barents Sea continental margin heat flow and Håkon Mosby Mud Volcano , 1999 .

[55]  Alexander S Savvichev,et al.  Microbial processes of carbon cycle as the base of food chain of Håkon Mosby Mud Volcano benthic community , 1999 .

[56]  Giuseppe Etiope,et al.  Geologic emissions of methane to the atmosphere. , 2002, Chemosphere.

[57]  D. B. Prior,et al.  Evidence for Sediment Eruption on Deep Sea Floor, Gulf of Mexico , 1989, Science.

[58]  V. Krupskaya,et al.  Stratigraphy of sediments from the Håkon Mosby Mud Volcano Area , 1999 .

[59]  K. Finster,et al.  Thermodynamic and kinetic requirements in anaerobic methane oxidizing consortia exclude hydrogen, acetate, and methanol as possible electron shuttles , 2001, Microbial Ecology.

[60]  H. Roberts,et al.  Chemosynthetic bacterial mats at cold hydrocarbon seeps, Gulf of Mexico continental slope , 1993 .

[61]  H. Jannasch,et al.  Chemosynthetic microbial activity at Mid-Atlantic Ridge hydrothermal vent sites , 1993 .

[62]  M. Alperin,et al.  Anaerobic methane oxidation by a methanogen-sulfate reducer consortium: geochemical evidence and biochemical considerations , 1996 .

[63]  Gerold Wefer,et al.  Ocean Margin Systems , 2003 .

[64]  Antje Boetius,et al.  The anaerobic oxidation of methane; new insights in microbial ecology and biogeochemistry , 2002 .

[65]  A. Milkov.  Worldwide distribution of submarine mud volcanoes and associated gas hydrates , 2000 .

[66]  J. Hayes,et al.  Molecular and isotopic analysis of anaerobic methane-oxidizing communities in marine sediments , 2000 .

[67]  T. Apanasovich,et al.  Global gas flux from mud volcanoes: A significant source of fossil methane in the atmosphere and the ocean , 2003 .