understanding of the past methane hydrate destabilization events on Earth, assuming that more reliable geological data is available. …

indicating rapid transitions between the presence of methane hydrates and vertical gas flux. Vertical profiles of dissolved … sulfate, chloride, calcium, magnesium, and dissolved inorganic carbon (DIC) concentrations in porewaters, headspace methane …, and solid phase carbonate concentrations were measured at each core location to investigate the cycling of methane …

Coastal methane hydrate deposits are globally abundant. There is a need to understand the deep sediment sourced methane … identified in geophysical surveys as an elevated bottom seismic reflection. Geochemical data revealed off-mound methane diffusion … and active fluid advection on-mound. Gas composition (average methane/ethane ratio ~11,000) and isotope ratios of methane …

Response surface methodology with a central composite design was applied to optimize the key factors affecting methane … that substrate concentration and initial pH had significant individual (<i>p</i> < 0.05) effect on methane yield (<i …

Methane hydrate formation and dissociation kinetics were investigated in seawater-saturated consolidated Ottawa sand …. Hydrate formation was achieved by methane charging followed by sediment cooling. The formation of hydrates was delayed with … thermally induced dissociation and pressure-temperature conditions followed theoretical methane-seawater equilibrium conditions …

Moderate elevated vertical methane (CH₄) flux is associated with sediment accretion and raised fluid … water and sediment were variable across the ridge suggesting close proximity of heterogeneous carbon sources. Methane stable … sources across the ridge and show a low methane contribution to organic carbon. …