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Methane seepage at Vestnesa Ridge (NW Svalbard) since the Last Glacial Maximum 5
Schneider, A.; Panieri, G.; Lepland, A.; Consolaro, C.; Cremiere, A.; Forwick, M.; Johnson, J. E.; Plaza-faverola, A.; Sauer, S.; Knies, J..
Multiple proxies in the geological record offshore NW Svalbard track shallow subseafloor diagenesis and seafloor methane seepage during the Last Glacial Maximum (LGM) extent and the disintegration of the Svalbard Barents Sea Ice Sheet (SBIS). Vestnesa Ridge, located at 79°N and in 1200 m water depth, is one of the northernmost known active methane seep sites and is characterised by a subseafloor fluid flow system, numerous seafloor pockmarks and gas flares in the water column. In this study, we develop a Late Pleistocene and Holocene stratigraphic framework, use stable oxygen and carbon isotope signatures (δ18O, δ13C) of benthic and planktic foraminifera, the mineralogical and carbon isotope composition of methane-derived authigenic carbonate (MDAC) and...
Tipo: Text Palavras-chave: Micropaleontology; Foraminifers; Stable isotopes; Methane seepage; Authigenic carbonate; Holocene; Pleistocene; Paleogeography; Deglaciation; Arctic Ocean.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00445/55652/60554.pdf
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Observation of microbial carbonate build-ups growing at methane seeps near the upper boundary of the gaszhydrate stability zone in the Black sea 13
Gulin, S. B.; Greinert, J.; Egorov, V. N.; De Batist, M.; Artemov, Yu. G..
Extensive dredge sampling carried out in May-June 2004 in the deeper part of the Dnepr paleo-delta area (NW Black Sea) yielded for the first time chimney-shaped carbonate microbial build-ups, which occur at methane seeps close to upper boundary of the gas-hydrate stability zone (~ 700 m). Carbonate samples taken with a benthic trawl represent fragments of the uppermost, middle and lowest parts of the build-up; they are similar morphologically to those found previously at the shallower and deeper methane seeps in the Black Sea. At the same time, the perforated, plate-like carbonates in the lowest parts of the build-up provide first indications that gas channels are formed during the earliest growth phase of these microbial structures. Stable carbon isotope...
Tipo: Journal Contribution Palavras-chave: Black Sea; Methane seepage; Gas hydrates; Черное море; Метановые сипы; Газогидраты Methane Gas hydrates Gas seepages Methane http://aims.fao.org/aos/agrovoc/c_4784.
Ano: 2005 URL: http://repository.ibss.org.ua/dspace/handle/99011/215
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