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Isotopic composition of gas hydrates in subsurface sediments from offshore Sakhalin Island, Sea of Okhotsk |
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| Authors: | Akihiro Hachikubo Alexey Krylov Hirotoshi Sakagami Hirotsugu Minami Yutaka Nunokawa Hitoshi Shoji Tatiana Matveeva Young K Jin Anatoly Obzhirov |
| Institution: | 1. Kitami Institute of Technology, 165 Koen-cho, Kitami, 090-8507, Japan 2. All-Russia Research Institute for Geology and Mineral Resources of the World Ocean, 1 Angliysky Ave., St. Petersburg, 190121, Russia 3. Korea Polar Research Institute, KORDI, 503 Get-Pearl Tower, Songdo Techno Park, 7-50 Songdo-dong, Yeonsu-gu, Incheon, 406-840, South Korea 4. V.I. Il’ichev Pacific Oceanological Institute FEB RAS, 43 Baltiyskaya St., Vladivostok, 690041, Russia |
| Abstract: | Hydrate-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. |
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