Quantifying in-situ gas hydrates at active seep sites in the eastern Black Sea using pressure coring technique K. Heeschen, M. Haeckel, I. Klaucke, M. K. Ivanov, and G. Bohrmann Research Centre Ocean Margins, Bremen, Germany Leibniz Institute of Marine Sciences (IFM-GEOMAR), Kiel, Germany M.V. Lomonosov Moscow State University, Moscow, Russia now at: Federal Institute for Geosciences and Natura...

Methanotrophs are ubiquitous in soil, fresh water and the open ocean, but have not been well characterized in deep-sea hydrocarbon seeps and gas hydrates, where methane is unusually abundant. Here we report the presence of new functional genes for the aerobic oxidation of methane by methanotrophs in marine sediments associated with gas hydrates and hydrocarbon seeps in the Gulf of Mexico. Sampl...

Abstract. Soil bacteria rank among the most diverse groups of organisms on Earth and actively impact global processes carbon cycling, especially in emission greenhouse gases like methane, CO2 higher gaseous hydrocarbons. An abundant group soil are mycobacteria, which colonize various terrestrial, marine anthropogenic environments due to their impermeable cell envelope that contains remarkable l...

Methane cold seep systems typically exhibit extensive buildups of authigenic carbonate minerals, resulting from local increases in alkalinity driven by methane oxidation. Here, we demonstrate that modern seep authigenic carbonates exhibit anomalously low clumped isotope values (Δ47), as much as ∼0.2‰ lower than expected values. In modern seeps, this range of disequilibrium translates into appar...

The importance of tectonics and fluid flow in controlling cold seep habitats has long been appreciated at convergent margins but remains poorly understood in strike-slip systems. Here we present geophysical, geochemical, and biological data from an activemethane seep offshore fromDelMar, California, in the inner California borderlands (ICB). The location of this seep appears controlled by local...

The 3D seismic data acquired in the central Qiongdongnan Basin, northwestern South China Sea, reveal presence of shallow gas hydrate, free gas, and focused fluid flow study area, which are indicated by multiple anomalies, including bottom simulating reflectors, polarity reverses, pulldowns, minor faults, chimneys intensively emplaced within strata. A new cold seep is also discovered at approxim...

Abstract Engineered geological porous media hydrogen storage must be designed to ensure secure storage, and use appropriate monitoring, measurement verification tools. Here, we identify characterize 60 natural seeps as analogues for potential leakage from engineered reservoirs consider implications monitoring. We report compare the environmental setting; seepage mode (dry gas/associated with wa...

UNLABELLED Marine methane seeps are globally distributed geologic features in which reduced fluids, including methane, are advected upward from the subsurface. As a result of alkalinity generation during sulfate-coupled methane oxidation, authigenic carbonates form slabs, nodules, and extensive pavements. These carbonates shape the landscape within methane seeps, persist long after methane flux...