start-ver=1.4 cd-journal=joma no-vol=83 cd-vols= no-issue=4 article-no= start-page=841 end-page=848 dt-received= dt-revised= dt-accepted= dt-pub-year=2003 dt-pub=20038 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Sulphur-isotopic composition of the deep-sea mussel Bathymodiolus marisindicus from currently active hydrothermal vents in the Indian Ocean en-subtitle= kn-subtitle= en-abstract= kn-abstract=

Sulphur-isotopic composition of soft tissues from bathymodiolus marisindicus collected from hydrothermal vents in the indian ocean was reported. the [delta]34s values of the soft tissues (+3[similar]+5‰ vs ca?yon diablo troilite) were nearly identical to those from the associated hydrothermal fluid and chimney sulphides (+5 to +8‰), but were significantly different from that of the common seawater sulphate (+21‰), which suggested that the endosymbiotic bacteria used sulphide in the fluid as an energy source. transmission electron microscopic observation of the endosymbionts also suggested that the symbiont is a thioautotroph. bathymodiolus species, which depend on either sulphide or methane oxidation, or both, have a worldwide distribution. bathymodiolus marisindicus from the indian ocean has a close relationship with congeners in the pacific ocean as evidenced by form of symbiosis. biogeography and migration of the genus bathymodiolus based on the relevant data are briefly discussed.

en-copyright= kn-copyright= en-aut-name=YamanakaToshiro en-aut-sei=Yamanaka en-aut-mei=Toshiro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=MizotaChitoshi en-aut-sei=Mizota en-aut-mei=Chitoshi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=FujiwaraYoshihiro en-aut-sei=Fujiwara en-aut-mei=Yoshihiro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=ChibaHitoshi en-aut-sei=Chiba en-aut-mei=Hitoshi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=HashimotoJun en-aut-sei=Hashimoto en-aut-mei=Jun kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=GamoToshitaka en-aut-sei=Gamo en-aut-mei=Toshitaka kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= en-aut-name=OkudairaTakamoto en-aut-sei=Okudaira en-aut-mei=Takamoto kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=7 ORCID= affil-num=1 en-affil= kn-affil=University of Tsukuba affil-num=2 en-affil= kn-affil=Iwate University affil-num=3 en-affil= kn-affil=Japan Marine Science and Technology Center affil-num=4 en-affil= kn-affil=Okayama University affil-num=5 en-affil= kn-affil=Japan Marine Science and Technology Center, Tokyou affil-num=6 en-affil= kn-affil=Hokkaido University affil-num=7 en-affil= kn-affil=Osaka City University END start-ver=1.4 cd-journal=joma no-vol=12 cd-vols= no-issue=1 article-no= start-page=1 end-page=5 dt-received= dt-revised= dt-accepted= dt-pub-year=2005 dt-pub=20051231 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=沖縄トラフ第四与那国海丘海底熱水系チムニーの錫を含む黄銅鉱と白金を含む輝蒼鉛鉱 kn-title=Tin-bearing chalcopyrite and platinum-bearing bismuthinite in the active Tiger chimney, Yonaguni Knoll IV seafloor hydrothermal system, South Okinawa Trough, Japan en-subtitle= kn-subtitle= en-abstract= kn-abstract=The active sulfide chimney ore sampled from the flank of the active Tiger chimney in the Yonaguni Knoll IV hydrothermal system, South Okinawa Trough, consists of anhydrite, pyrite, shalerite, galena, chalcopyrite and bismuthinite. Electron microprobe analyses indicated that the chalcopyrite and bismuthinite contain up to 2.4 wt. % Sn and 1.7 wt. % Pt, respectively. The high Sn-bearing chalcopyrite and Pt-bearing bismuthinite are the first occurrence of such minerals on the submarine hydrothermal systems so far reported. The results confirm that the Sn enters the chalcopyrite as a solid solution towards stannite by the coupled substitution of Sn 4+ Fe 2+ for Fe 3+ Fe 3+ while Pt enters the bismuthinite structure as a solid solution during rapid growth. The homogenization temperature of the fluid inclusions in anhydrite (220-310℃) and metasured end-member temperature of the vent fluids (325℃) indicate that the minerals are precipitated as metastable phases at temperature around 300℃. The Sn-bearing chalcopyrite and Pt-bearing bismuthinite expess the original composition of the minerals deposited from a hydrothermal fluid with temperatures of about 300℃. en-copyright= kn-copyright= en-aut-name=GenaKaul en-aut-sei=Gena en-aut-mei=Kaul kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=ChibaHiroshi en-aut-sei=Chiba en-aut-mei=Hiroshi kn-aut-name=千葉仁 kn-aut-sei=千葉 kn-aut-mei=仁 aut-affil-num=2 ORCID= en-aut-name=KaseKatsuo en-aut-sei=Kase en-aut-mei=Katsuo kn-aut-name=加瀬克雄 kn-aut-sei=加瀬 kn-aut-mei=克雄 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Department of Earth Sciences, Faculty of Science, Okayama University affil-num=2 en-affil= kn-affil=Department of Earth Sciences, Faculty of Science, Okayama University affil-num=3 en-affil= kn-affil=Department of Earth Sciences, Faculty of Science, Okayama University en-keyword=Sn-bearing chalcopyrite kn-keyword=Sn-bearing chalcopyrite en-keyword=Pt-bearing bismuthinite kn-keyword=Pt-bearing bismuthinite en-keyword=Active sulfide Chimmey kn-keyword=Active sulfide Chimmey en-keyword=Yonaguni Knoll IV kn-keyword=Yonaguni Knoll IV en-keyword=Okinawa Trough kn-keyword=Okinawa Trough en-keyword=seafloor hydrothermal system kn-keyword=seafloor hydrothermal system END start-ver=1.4 cd-journal=joma no-vol=56 cd-vols= no-issue= article-no= start-page=27 end-page=34 dt-received= dt-revised= dt-accepted= dt-pub-year=1985 dt-pub=19850330 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Automatic measurement of oxygen isotope ratio of water samples kn-title=水試料の敢素同位体比の自動測定 en-subtitle= kn-subtitle= en-abstract= kn-abstract=The automatic sample preparation system for oxygen isotope analysis of natural water samples was constructed. The system is essentially a modification of that originally designed by W. Dansgaard in the University of Copenhagen. Sixty water samples of 5 ml each are automatically equilibrated with CO(2) of 30 ml NTP each within 4.5 hours. The equilibrated CO(2) gases are successively measured for their oxygen isotopic ratios by an automatic mas-sspectrometer, VG903. The time required for the measurement of the 60 CO(2) samples is about 15 hours; thus approximately 20 hours are required to complete the isotopic measurements of 60 water samples. The accuracy of the oxygen isotopic analyses is about 0.1%. The result of oxygen isotopic analyses by the automatic preparation system agrees with that of the conventional method within about +0.1%. The results indicate that the automatic preparation system is applicable for the oxygen isotope analysis of natural water samples. en-copyright= kn-copyright= en-aut-name=ChibaHitoshi en-aut-sei=Chiba en-aut-mei=Hitoshi kn-aut-name=千葉仁 kn-aut-sei=千葉 kn-aut-mei=仁 aut-affil-num=1 ORCID= en-aut-name=SakaiHitoshi en-aut-sei=Sakai en-aut-mei=Hitoshi kn-aut-name=酒井均 kn-aut-sei=酒井 kn-aut-mei=均 aut-affil-num=2 ORCID= en-aut-name=YasutakeMasatoshi en-aut-sei=Yasutake en-aut-mei=Masatoshi kn-aut-name=安武正敏 kn-aut-sei=安武 kn-aut-mei=正敏 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学温泉研究所 affil-num=2 en-affil= kn-affil=東京大学海洋研究所 affil-num=3 en-affil= kn-affil=セイコー電子工業株式会社科学横器事業部 END