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Discovery of a new hydrothermal venting site in the southernmost Mariana Arc: Al-rich hydrothermal plumes and white smoker activity associated with biogenic methane

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Title: Discovery of a new hydrothermal venting site in the southernmost Mariana Arc: Al-rich hydrothermal plumes and white smoker activity associated with biogenic methane
Authors: Gamo, Toshitaka Browse this author →KAKEN DB
Masuda, Harue Browse this author →KAKEN DB
Yamanaka, Toshiro Browse this author
Okamura, Kei Browse this author
Ishibashi, Junichiro Browse this author
Nakayama, Eiichiro Browse this author
Obata, Hajime Browse this author →KAKEN DB
Shitashima, Kiminori Browse this author →KAKEN DB
Nishio, Yoshiro Browse this author →KAKEN DB
Hasumoto, Hiroshi Browse this author →KAKEN DB
Watanabe, Masaharu Browse this author
Mitsuzawa, Kyohiko Browse this author
Seama, Nobukazu Browse this author →KAKEN DB
Tsunogai, Urumu Browse this author →KAKEN DB
Kouzuma, Fumitaka Browse this author
Sano, Yuji Browse this author →KAKEN DB
Keywords: submarine hydrothermal activity
southern Mariana Trough
hydrothermal plume chemistry
aluminum anomaly
biogenic methane
Issue Date: 19-Apr-2004
Publisher: The Geochemical Society of Japan
Journal Title: Geochemical journal
Volume: 38
Issue: 6
Start Page: 527
End Page: 534
Abstract: This paper reports a series of studies leading to the discovery of a submarine hydrothermal field (called Nakayama Field) at an arc seamount (12∞43¢ N, 143∞32¢ E) in the southernmost part of the Mariana Trough, western Pacific Ocean. We first detected hydrothermal plumes characterized by water column anomalies of temperature, light transmission, Mn, Fe, Al, O2, CH4, and d13C of CH4 above the summit caldera of the seamount. Then deep-tow camera surveys confirmed the existence of hydrothermal activity inside the caldera, and an ROV dive finally discovered white smoker-type fluid venting associated with vent fauna. A high concentration of aluminum in the plume and white smoker-type emissions imply acidic hydrothermal activity similar to that observed at the DESMOS Caldera in the eastern Manus Basin, Papua New Guinea. Anomalously low d13C (CH4) of .38‰ of a vent fluid sample compared to other arc hydrothermal systems along the Izu- Bonin and Mariana Arcs suggests an incorporation of biogenic methane based on a subsurface microbial ecosystem.
Type: article
URI: http://hdl.handle.net/2115/44839
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 角皆 潤

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