Geological control and magnitude of methane ebullition from a high-flux seep area in the Black Sea—the Kerch seep area
作者： Miriam Römer , Heiko Sahling , Thomas Pape , André Bahr , Tomas Feseker
DOI: 10.1016/J.MARGEO.2012.07.005
关键词:
摘要: Abstract We investigated gas bubble emissions at the Don–Kuban paleo-fan in northeastern Black Sea regarding their geological setting, quantities as well spatial and temporal variabilities during three ship expeditions between 2007 2011. About 600 bubble-induced hydroacoustic anomalies water column (flares) originating from seafloor above hydrate stability zone (GHSZ) ~ 700 m depth were found. At about 890 m a hydrocarbon seep area named “Kerch area” was newly discovered within GHSZ. propose locally domed sediments (“mounds”) ultra-high resolution bathymetric mapping with an autonomous underwater vehicle (AUV) to result accumulation shallow depths. In situ measurements indicated spatially limited temperature elevations sediment likely induced by upward fluid flow which may confine local GHSZ few meters below seafloor. As result, bubbles are suspected migrate into near-surface escape through small-scale faults. Hydroacoustic surveys revealed that several flares originated of 1 km2 size. The highest flare disappeared 350 m depth, suggesting released methane remains column. A flux estimate, combining data visual quantifications dives remotely operated (ROV) results ship-based analysis 2 87 × 106 mol CH4 yr− 1 escaped Kerch area. Our show finding represents so far underestimated type seep, has be considered budget calculations.
harvard.edu
marum.de参考文章(69)
Aneta Nikolovska, Heiko Sahling, Gerhard Bohrmann, Hydroacoustic methodology for detection, localization, and quantification of gas bubbles rising from the seafloor at gas seeps from the eastern Black Sea Geochemistry Geophysics Geosystems. ,vol. 9, ,(2008) , 10.1029/2008GC002118
Gregor Rehder, Peter W. Brewer, Edward T. Peltzer, Gernot Friederich, Enhanced lifetime of methane bubble streams within the deep ocean Geophysical Research Letters. ,vol. 29, pp. 21- 1 ,(2002) , 10.1029/2001GL013966
Matthias Haeckel, Erwin Suess, Klaus Wallmann, Dirk Rickert, Rising methane gas bubbles form massive hydrate layers at the seafloor Geochimica et Cosmochimica Acta. ,vol. 68, pp. 4335- 4345 ,(2004) , 10.1016/J.GCA.2004.01.018
Ingo Klaucke, Heiko Sahling, Wilhelm Weinrebe, Valentina Blinova, Dietmar Bürk, Nona Lursmanashvili, Gerhard Bohrmann, Acoustic investigation of cold seeps offshore Georgia, eastern Black Sea Marine Geology. ,vol. 231, pp. 51- 67 ,(2006) , 10.1016/J.MARGEO.2006.05.011
A.G. Robinson, J.H. Rudat, C.J. Banks, R.L.F. Wiles, Petroleum geology of the Black Sea Marine and Petroleum Geology. ,vol. 13, pp. 195- 223 ,(1996) , 10.1016/0264-8172(95)00042-9
Thomas Pape, André Bahr, Stephan A. Klapp, Friedrich Abegg, Gerhard Bohrmann, High-intensity gas seepage causes rafting of shallow gas hydrates in the southeastern Black Sea Earth and Planetary Science Letters. ,vol. 307, pp. 35- 46 ,(2011) , 10.1016/J.EPSL.2011.04.030
Young Keun Jin, Young-Gyun Kim, Boris Baranov, Hitoshi Shoji, Anatoly Obzhirov, Distribution and expression of gas seeps in a gas hydrate province of the northeastern Sakhalin continental slope, Sea of Okhotsk Marine and Petroleum Geology. ,vol. 28, pp. 1844- 1855 ,(2011) , 10.1016/J.MARPETGEO.2011.03.007
Ira Leifer, Ian MacDonald, Dynamics of the gas flux from shallow gas hydrate deposits: interaction between oily hydrate bubbles and the oceanic environment Earth and Planetary Science Letters. ,vol. 210, pp. 411- 424 ,(2003) , 10.1016/S0012-821X(03)00173-0
Lieven Naudts, Jens Greinert, Yuriy Artemov, Stan E. Beaubien, Christian Borowski, Marc De Batist, Anomalous sea-floor backscatter patterns in methane venting areas, Dnepr paleo-delta, NW Black Sea Marine Geology. ,vol. 251, pp. 253- 267 ,(2008) , 10.1016/J.MARGEO.2008.03.002
I. Leifer, A. G. Judd, Oceanic methane layers: the hydrocarbon seep bubble deposition hypothesis Terra Nova. ,vol. 14, pp. 417- 424 ,(2002) , 10.1046/J.1365-3121.2002.00442.X