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
Author Chiba, Hitoshi| Sakai, Hitoshi| Yasutake, Masatoshi|
Published Date 1985-03-30
Publication Title 岡山大学温泉研究所報告
Volume volume56
Content Type Departmental Bulletin Paper
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 英語
Copyright Holders 岡山大学地球科学研究報告編集委員会
File Version publisher
NAID 120002310444