{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,31]],"date-time":"2026-01-31T00:48:02Z","timestamp":1769820482828,"version":"3.49.0"},"reference-count":117,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2016,8,19]],"date-time":"2016-08-19T00:00:00Z","timestamp":1471564800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/100007465","name":"Universitetet i Troms\u00f8","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100007465","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100005416","name":"Norges Forskningsr\u00e5d","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100005416","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Boreas"],"published-print":{"date-parts":[[2017,4]]},"abstract":"<jats:p>The effect of seeping of methane on marine sediment records has been studied in four gravity cores from Vestnesa Ridge, Svalbard margin. The area shows acoustic signs in the form of flares indicating active methane gas seepage. For a better understanding of the timing and variability of the flux of methane in the past and the effects on potential proxies, a detailed study of the diagenetic processes that may affect the composition and structure of both sediments and foraminiferal shells is needed. Here we discuss deep\u2010sea records from methane\u2010influenced environments in three cores from an active and very heterogeneous seep\u2010area (pockmark) and one core from outside the pockmark for background. The results include the distribution and stable isotopes of authigenic carbonates and of benthic and planktonic foraminifera, magnetic susceptibility, <jats:styled-content style=\"fixed-case\">AMS<\/jats:styled-content>\u2010<jats:sup>14<\/jats:sup>C dates, sedimentary data and biostratigraphy. Extremely low \u03b4<jats:sup>13<\/jats:sup>C values recorded in both benthic and planktonic foraminifera during the B\u00f8lling\u2010Aller\u00f8d interstadials indicate possible increased methane flux beginning at late Heinrich event H1. The recorded low values are mainly a result of diagenetic overprint by methane\u2010derived authigenic carbonates. The \u03b4<jats:sup>18<\/jats:sup>O signals of authigenic carbonates are close to those of foraminiferal calcite and thus the \u03b4<jats:sup>18<\/jats:sup>O records remain a valid stratigraphical tool in methane seep sites, except in the case of severely encrusted samples. In addition, the records from the active pockmark show nearly constant values of low magnetic susceptibility in contrast to higher and more variable magnetic susceptibility values from the control station and other published records from normal sediments west of Svalbard. This phenomenon is probably caused by dissolution of magnetic minerals in the reducing environmental conditions of methane seep sediments, associated with anaerobic oxidation of methane and formation of paramagnetic minerals (pyrite). This process enables magnetic susceptibility to be used as a common diagnostic tool for identifying methane\u2010related palaeo\u2010reductive environments.<\/jats:p>","DOI":"10.1111\/bor.12202","type":"journal-article","created":{"date-parts":[[2016,8,19]],"date-time":"2016-08-19T08:43:19Z","timestamp":1471596199000},"page":"212-228","source":"Crossref","is-referenced-by-count":37,"title":["Diagenetic disturbances of marine sedimentary records from methane\u2010influenced environments in the Fram Strait as indications of variation in seep intensity during the last 35\u00a0000\u00a0years"],"prefix":"10.1111","volume":"46","author":[{"given":"Kamila","family":"Sztybor","sequence":"first","affiliation":[{"name":"CAGE \u2010 Centre for Arctic Gas Hydrate, Environment and Climate Department of Geology UiT The Arctic University of Norway Troms\u00f8 N\u20109037 Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tine 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Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2016,8,19]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1029\/JC092iC04p03778"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1029\/JC090iC03p04833"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0278-4343(02)00061-4"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0967-0637(96)00075-1"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0967-0637(01)00017-6"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1093\/icesjms\/fss056"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1029\/2010GC003397"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.quascirev.2003.10.001"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1038\/35036572"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1038\/365143a0"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1130\/0091-7613(1996)024<0655:MPWSPI>2.3.CO;2"},{"key":"e_1_2_8_13_1","first-page":"161","article-title":"The 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