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長崎県橘湾における浅海底熱水系


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Title: 長崎県橘湾における浅海底熱水系
Other Titles: Shallow submarine hydrothermal system in Tachibana Bay, Nagasaki, Japan
Authors: 武田, 重信 / 田中, 大揮 / 高尾, 芳三 / 兼原, 壽生
Authors (alternative): Takeda, Shigenobu / Tanaka, Daiki / Takao, Yoshimi / Kanehara, Hisao
Issue Date: Mar-2012
Publisher: 長崎大学水産学部 / The Faculty of Fisheries, Nagasaki University
Citation: 長崎大学水産学部研究報告, 93, pp.33-39; 2012
Abstract: Distribution of hydrothermal activities and chemical composition of surrounding sediments were investigated for shallow submarine hydrothermal systems in Tachibana Bay, Nagasaki, Japan as a first step to elucidate its possible influences to the coastal ecosystem. Based on the observations of fumarolic gas emissions using quantitative echosounder, existence of hydrothermal activities was confirmed at 33- 34 m depth near the coast of Obama hot springs. These were many small (2-6 mm in diameter) holes on the surface of the bottom sediment, and the area of the fumarolic gas emissions had a horizontal scale of 6-63 m. Hot (78℃) and dark subsurface-sediment at the hydrothermal activity region showed unusual elemental composition characterized by higher contents of Al, S and As, and lower amounts of Ca, Cl and Br compared with that of the typical coastal sediment.
Keywords: 熱水噴出孔 / Hydrothermal vent / 橘湾 / Tachibana Bay / 堆積物 / Sediment
URI: http://hdl.handle.net/10069/28761
ISSN: 05471427
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:No. 93

Citable URI : http://hdl.handle.net/10069/28761

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