10.18710/FWUKX0Ambrose, William G.William G.AmbroseDivision of Polar Programs, National Science Foundation, Arlington, VA, 22230, USAPanieri, GiulianaGiulianaPanieriUiT The Arctic University of NorwaySchneider, AndreaAndreaSchneiderUiT The Arctic University of NorwayPlaza-Faverola, AndreiaAndreiaPlaza-FaverolaUiT The Arctic University of NorwayCarroll, Michael. L.Michael. L.CarrollUiT The Arctic University of NorwayÅström, Emmelie K. L.Emmelie K. L.ÅströmUiT The Arctic University of NorwayLocke V, William L.William L.Locke VDepartment of Biology, Bates College, Lewiston, Maine, USACarroll, JoLynnJoLynnCarroll0000-0002-6598-0818UiT The Arctic University of NorwayReplication Data for: Bivalve shell horizons in seafloor pockmarks of the last glacial-interglacial transition suggest a thousand years of methane emissions in the Arctic OceanDataverseNO2016Earth and Environmental Sciencesmethane hydratepockmarksshell bedsforaminiferacarbonate geochemistryfaultingCaroll, JoLynnJoLynnCarollUiT The Arctic University of NorwaySarti, FabioFabioSartiUiT The Arctic University of NorwayUiT The Arctic University of NorwayTheThe Arctic University of NorwayUiT The Arctic University of NorwayTheThe Arctic University of NorwayUiT The Arctic University of Norway2016-05-182023-09-282013-10-13/2013-10-1410.1002/2015GC0059802275720981111603138516809782998792618154276271612675018421787413094133929164217271419401273789106368136235574964315149531508819199196813853271692513521140215423013511484application/vnd.openxmlformats-officedocument.wordprocessingml.documentapplication/pdftext/plaintext/tab-separated-valuesapplication/vnd.openxmlformats-officedocument.wordprocessingml.documentapplication/pdftext/plainapplication/pdftext/plainapplication/pdftext/plainapplication/pdftext/plainapplication/pdftext/plainapplication/pdftext/plainapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfimage/jpegapplication/pdfapplication/pdfapplication/vnd.openxmlformats-officedocument.wordprocessingml.documentapplication/pdftext/plainapplication/pdftext/tab-separated-valuestext/plain1.2CC0 1.0The paper presents discrete bivalve shell horizons in two gravity cores from seafloor pockmarks on the Vestnesa Ridge (ca. 1200 m water depth), western Svalbard (79° 00’ N, 06° 55’ W) to provide insight into the temporal and spatial dynamics of seabed methane seeps. The shell beds, dominated by two genera of the family Vesicomyidae: Phreagena s.l. and Isorropodon sp., were 20-30cm thick and centered at 250-400cm deep in the cores. The carbon isotope composition of inorganic (δ13C from -13.02‰ to +2.36‰) and organic (δ13C from -29.28‰ to -21.33‰) shell material and a two-end member mixing model indicate that these taxa derived between 8% and 43% of their nutrition from chemosynthetic bacteria. In addition, negative δ13C values for planktonic foraminifera (-6.7‰ to -3.1‰), micritic concretions identified as methane-derived authigenic carbonates, and pyrite encrusted fossil worm tubes at the shell horizons indicate a sustained paleo-methane seep environment. Combining sedimentation rates with 14C ages for bivalve material from the shell horizons, we estimate the horizons persisted for about 1000 years between approximately 17,707 to 16,680 yrs. BP (corrected). The seepage event over a 1000-year time interval was most likely associated with regional stress-related faulting and the subsequent release of over-pressurized fluids.The Research Council of Norway223259