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Modelling persistent methane seepage offshore western Svalbard since early Pleistocene
(Journal article; Tidsskriftartikkel; Peer reviewed, 2018-01-31)
Recent observations of extensive methane release into the oceans and atmosphere have raised
concern as to whether rising temperatures across the Arctic could drive rapid destabilization
of gas hydrate reservoirs. Here, we report modelling results from hydrate-modulated methane
seepage from Vestnesa Ridge, offshore western Svalbard, suggesting that continuous leakage
has occurred from the seafloor ...
Role of tectonic stress in seepage evolution along the gas hydrate-charged Vestnesa Ridge, Fram Strait
(Journal article; Tidsskriftartikkel, 2015-02-03)
Abiotic methane from ultraslow-spreading ridges can charge Arctic gas hydrates
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-05)
Biotic gas generation from the degradation of organic carbon in marine sediments supplies and maintains gas hydrates throughout the world’s oceans. In nascent, ultraslow-spreading ocean basins, methane generation can also be abiotic, occurring during the high-temperature (>200 °C) serpentinization of ultramafic rocks. Here, we report on the evolution of a growing Arctic gas- and gas hydrate–charged ...
Role of tectonic stress in seepage evolution along the gas hydrate‐charged Vestnesa Ridge, Fram Strait
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-01-13)
Methane expulsion from the world ocean floor is a broadly observed phenomenon known to be episodic. Yet the processes that modulate seepage remain elusive. In the Arctic offshore west Svalbard, for instance, seepage at 200–400 m water depth may be explained by ocean temperature‐controlled gas hydrate instabilities at the shelf break, but additional processes are required to explain seepage in ...
The Plio-Pleistocene seepage history off western Svalbard inferred from 3D petroleum systems modelling
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-03-05)
Methane seepage off the coast of Svalbard is demonstrated by active gas flares in the water column today and through precipitation of methane-derived authigenic carbonates (MDAC) over the past 160 000 years. Though submarine discharge of thermogenic methane is well documented, the geological history of past leakage is still debated, largely due to unconstrained free gas sources and seepage trigger ...
A 160,000-year-old history of tectonically controlled methane seepage in the Arctic
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-08-07)
The geological factors controlling gas release from Arctic deep-water gas reservoirs through seabed methane seeps are poorly constrained. This is partly due to limited data on the precise chronology of past methane emission episodes. Here, we use uranium-thorium dating of seep carbonates sampled from the seabed and from cores drilled at the Vestnesa Ridge, off West Svalbard (79°N, ~1200 m water ...