| 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)
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