Chiba, Hiroshi - OU Author List - OKAYAMA UNIVERSITY SCIENTIFIC ACHIEVEMENT REPOSITORY

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Sulphur-isotopic composition of the deep-sea mussel Bathymodiolus marisindicus from currently active hydrothermal vents in the Indian Ocean

Author	Yamanaka, Toshiro\| Mizota, Chitoshi\| Fujiwara, Yoshihiro\| Chiba, Hitoshi\| Hashimoto, Jun\| Gamo, Toshitaka\| Okudaira, Takamoto\|
Published Date	2003-8
Publication Title	Journal of the Marine Biological Association of the UK
Volume	volume83
Issue	issue4
Content Type	Journal Article

Tin-bearing chalcopyrite and platinum-bearing bismuthinite in the active Tiger chimney, Yonaguni Knoll IV seafloor hydrothermal system, South Okinawa Trough, Japan

JaLCDOI	10.18926/ESR/13850
Title Alternative	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
FullText URL	ESR_12_1.pdf
Author	Gena, Kaul\| Chiba, Hiroshi\| Kase, Katsuo\|
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℃.
Keywords	Sn-bearing chalcopyrite Pt-bearing bismuthinite Active sulfide Chimmey Yonaguni Knoll IV Okinawa Trough seafloor hydrothermal system
Publication Title	Okayama University Earth Science Report
Published Date	2005-12-31
Volume	volume12
Issue	issue1
Start Page	1
End Page	5
ISSN	1340-7414
language	English
Copyright Holders	岡山大学地球科学研究報告編集委員会
File Version	publisher
NAID	120002310444

水試料の敢素同位体比の自動測定

JaLCDOI	10.18926/21085
Title Alternative	Automatic measurement of oxygen isotope ratio of water samples
FullText URL	pitsr_056_027_034.pdf
Author	Chiba, Hitoshi\| Sakai, Hitoshi\| Yasutake, Masatoshi\|
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.
Publication Title	岡山大学温泉研究所報告
Published Date	1985-03-30
Volume	volume56
Start Page	27
End Page	34
ISSN	0369-7142
language	Japanese
File Version	publisher
NAID	120002310952