Geochemical investigation of submarine hydrothermal systems.

海底热液系统的地球化学研究。

• 批准号: 60430010
• 负责人: SAKAI Hitoshi
• 金额: $ 19.26万
• 依托单位: Ocean Research Institute, University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (A)
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60430010/
• 关键词: Hydrothermal Activity; Methane; Trace Metals; Okanawa Trough; Mid-Ocean Ridges; 地球化学; 海底熱水鉱床; 海底熱水活動; メタンプルーム; シロウリ貝; 沈みこみ帯; 硫黄バクテリア; 海底火山; ICP発光分光分析; 熱水指標元素; 多元素分析

Hydrothermal activity of Loihi Seamount, Hawaii, was researched by using R/V Hakuho Maru (KH85-4) in September 1985. We established several basic techniques for locating submarine hydrothermal system: a CTD towing method for detecting temperature anomalies, and a method for mapping hydorthermal plumes from water column distributions of dissolved methane. Taking into account the importance of simultaneous measurements of many trace vetals in seawater, We purchased an ICP spectroscopy and have improved and utilized since then.From 1986, the survey target was focussed on the submarine hydrothermal activity in the Okinawa Trough. In July 1986, hydrothermal mounds (subsurface tempetature: 40゜C) issuing warm water were discovered at the Natsushima-84 Knoll in the middle Okinawa Trough by the submersible "SHINKAI 2000" (JAMSTEC). The shimmering water samples were proved to have high methane and ^3He/^4He values, characteristic of hydrothermal origin.In May 1987, the KH87-2 cruise of R/V Hakuh … More o Maru was dedicated to the geochemical studies in the Okinawa Trough. A revised CTD towing system for surveying hydrothermal activity, a piston corer with heat flow measuring probes, and a transponder navigating system were employed in addition to usual equipments.In 1988, the last year of the project, techiques so far developed were all concentrated on the Okinawa Trough surveys during the cruises: R/VCchofu Maru (Magasaki Marine Observatory) , R/V Sonne (West Germany) , M/V Kaiko Maru No.5 (DELP) , R/V Tansei Maru, and "SHINKAI 2000". Massive sulfide deposits with the emanation of hot fluids (>130゜C) were discovered at the Izena Cauldron, about 20 miles south of the Natsushima-84 Knoll. Water column anomalies of CH_4, MN, TCO_2, ^3He, ets. were also found there.The following areas were also surveyed by utilizing the same experimental techniques: Escanaba Trough in the Gorda Ridge spreading center, back-arc volcanism in the North Fiji Basin, fore-arc volcanism in the Izu-Bonin area, and plate boundaries in the Sagami Bay clam colony and in the eastern Japan Sea, etc. Less

1985年9月，利用"白凤丸"（KH 85 - 4）号考察船对夏威夷洛伊海海山的热液活动进行了研究。建立了海底热液系统定位的几种基本技术：探测温度异常的CTD拖曳法和根据溶解甲烷的水柱分布绘制热液羽流的方法。考虑到同时测量海水中多种微量元素的重要性，我们购买了一台ICP光谱仪，并进行了改进和利用。从1986年起，调查目标集中在冲绳海槽海底热液活动。1986年7月，"SHINKAI 2000"（JAMSTEC）潜水器在冲绳海槽中部的夏岛-84穹丘发现了产生热水的热液丘（地下温度：40 ℃）。1987年5月，“哈库”号考察船KH 87 - 2航次在中国南海海域进行了考察，结果表明，这些闪烁的水样具有较高的甲烷和^3 He/^4 He值，具有热液成因的特征。 ...更多信息 o Maru致力于冲绳海槽的地球化学研究。除了通常的设备外，还使用了一个改进的CTD拖曳系统，用于测量热液活动，一个带有热流测量探头的活塞取样器和一个应答器导航系统。1988年，即项目的最后一年，迄今为止开发的技术都集中在巡航期间的冲绳海槽测量上：R/V VCchofu Maru（Magasaki海洋观测站）、R/V索内（West德国）、M/V Kaiko Maru No.5（DELP）、R/V Tansei Maru和"SHINKAI 2000"。在Natsushima-84 Knoll以南约20英里处的Izena Cauldron发现了大量硫化物矿床，并散发出热流体（> 130 ℃）。CH_4、MN、TCO_2、^3He等水柱异常。利用同样的实验技术还调查了以下地区：戈尔达海脊扩张中心的埃斯卡诺巴海槽、北斐济盆地的弧后火山活动、伊豆-小笠原地区的弧前火山活动、相模湾蛤群和日本海东部的板块边界等。

项目成果

Becker, K.: "Proceedings of Ocean Drilling Program" Initial Reports. 111. (1988)

Becker, K.：“海洋钻探计划的记录”初步报告。

Ishibashi, J.: "Geochemical evidence for hydrothermal activity in the Okinawa Trough" Geochemical Journal. 22. 107-114 (1988)

Ishibashi, J.：“冲绳海槽热液活动的地球化学证据”地球化学杂志。

Ishibashi,J.: Geochemical Journal. 22. 107-114 (1988)

石桥，J.：地球化学杂志。

益田 晴恵: 225-231 (1987)

增田春惠：225-231 (1987)

Geochemical Journal. 19-4. (1985)

地球化学杂志。