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https://hdl.handle.net/20.500.14094/90008131
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2024-04-18
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90008131 (fulltext)
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90008131
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open access
出版タイプ
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タイトル
Microbial sulfate reduction plays an important role at the initial stage of subseafloor sulfide mineralization
著者
Nozaki, Tatsuo ; Nagase, Toshiro ; Ushikubo, Takayuki ; Shimizu, Kenji ; Ishibashi, Jun-ichiro ; the D/V Chikyu Expedition 909 Scientists
著者名
Nozaki, Tatsuo
著者名
Nagase, Toshiro
著者名
Ushikubo, Takayuki
著者名
Shimizu, Kenji
著者名
Ishibashi, Jun-ichiro
著者名
the D/V Chikyu Expedition 909 Scientists
収録物名
Geology
巻(号)
49(2)
ページ
222-227
出版者
Geological Society of America
刊行日
2020-10-07
公開日
2021-04-14
抄録
Seafloor hydrothermal deposits form when hydrothermal fluid mixes with ambient seawater, and constituent sulfide minerals are usually interpreted to precipitate abiogenically. Recent research drilling at Izena Hole and Iheya North Knoll in the middle Okinawa Trough (East China Sea), combined with secondary ion mass spectrometry determinations of δ34S in pyrite grains, provides compelling evidence that the initial stage of subseafloor sulfide mineralization is closely associated with microbial sulfate reduction. During the sulfide maturation process, pyrite textures progress from framboidal to colloform to euhedral. Pyrite δ34S has highly negative values (as low as –38.9‰) in framboidal pyrite, which systematically increase toward positive values in colloform and euhedral pyrite. Sulfur isotope fractionation between seawater sulfate (+21.2‰) and framboidal pyrite (–38.9‰) is as great as –60‰, which can be attained only by microbial sulfate reduction in an open system. Because framboidal pyrite is commonly replaced by chalcopyrite, galena, and sphalerite, framboidal pyrite appears to function as the starting material (nucleus) of other sulfide minerals. We conclude that framboidal pyrite, containing microbially reduced sulfur, plays an important role at the initial stage of subseafloor sulfide mineralization.
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学術雑誌論文
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© 2020 The Authors.
This paper is published under the terms of the CC-BY license.
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資源タイプ
journal article
言語
English (英語)
ISSN
0091-7613
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eISSN
1943-2682
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関連情報
DOI
https://doi.org/10.1130/G47943.1
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