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Isotopic composition of gas hydrates in subsurface sediments from offshore Sakhalin Island, Sea of Okhotsk

Cited 15 time in wos
Cited 18 time in scopus

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dc.contributor.authorAnatoly Obzhirov-
dc.contributor.authorTatiana Matveeva-
dc.contributor.authorAlexey Krylov-
dc.contributor.authorHitoshi Shoji-
dc.contributor.authorJin, Young Keun-
dc.contributor.authorYutaka Nunokawa-
dc.contributor.authorHirotsugu Minami-
dc.contributor.authorHirotoshi Sakagami-
dc.contributor.authorAkihiro Hachikubo-
dc.coverage.spatialSea of Okhotsk-
dc.date.accessioned2018-03-20T13:42:40Z-
dc.date.available2018-03-20T13:42:40Z-
dc.date.issued2010-
dc.identifier.urihttps://repository.kopri.re.kr/handle/201206/6151-
dc.description.abstractHydrate-bearing sediment cores were retrieved from recently discovered seepage sites located offshore Sakhalin Island in the Sea of Okhotsk. We obtained samples of natural gas hydrates and dissolved gas in pore water using a headspace gas method for determining their molecular and isotopic compositions. Molecular composition ratios C1/C2+ from all the seepage sites were in the range of 1,500?-50,000, while δ¹³C and δD values of methane ranged from ??66.0 to??63.2‰VPDB and ??204.6 to ??196.7‰VSMOW, respectively. These results indicate that the methane was produced by microbial reduction of CO2. δ¹³C values of ethane and propane (i.e., ??40.8 to ??27.4‰VPDB and ??41.3 to ??30.6‰VPDB, respectively) showed that small amounts of thermogenic gas were mixed with microbial methane. We also analyzed the isotopic difference between hydrate-bound and dissolved gases, and discovered that the magnitude by which the δD hydrate gas was smaller than that of dissolved gas was in the range 4.3??16.6‰?, while there were no differences in δ¹³C values. Based on isotopic fractionation of guest gas during the formation of gas hydrate, we conclude that the current gas in the pore water is the source of the gas hydrate at the VNIIOkeangeologia and Giselle Flare sites, but not the source of the gas hydrate at the Hieroglyph and KOPRI sites.-
dc.languageEnglish-
dc.publisherSpringer-
dc.subjectGeology-
dc.subjectOceanography-
dc.titleIsotopic composition of gas hydrates in subsurface sediments from offshore Sakhalin Island, Sea of Okhotsk-
dc.title.alternative오호츠크해 사할린섬 주변에서 획득된 퇴적물 내 가스하이드레이트의 동위원소 조성-
dc.typeArticle-
dc.identifier.bibliographicCitationAnatoly Obzhirov, et al. 2010. "Isotopic composition of gas hydrates in subsurface sediments from offshore Sakhalin Island, Sea of Okhotsk". <em>GEO-MARINE LETTERS</em>, 30(3-4): 313-319.-
dc.citation.titleGEO-MARINE LETTERS-
dc.citation.volume30-
dc.citation.number3-4-
dc.identifier.doi10.1007/s00367-009-0178-y-
dc.citation.startPage313-
dc.citation.endPage319-
dc.description.articleClassificationSCI-
dc.description.jcrRateJCR 2008:56.25-
dc.subject.keywordC1/C2-
dc.subject.keywordSea of Okhotsk-
dc.subject.keywordgas hydrate-
dc.subject.keywordδD-
dc.subject.keywordδ¹³C-
dc.identifier.localId2010-0076-
dc.identifier.scopusid2-s2.0-77952952372-
dc.identifier.wosid000277941800013-
Appears in Collections  
2004-2011, Oceanographic Research on the Arctic Sea (04-11) / Chung, Kyung Ho; Lee, Sang Heon (PM27800, PM05010, PM07020, PM10040, PM06020, PM08030, PM09020, PM11050)
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