权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Chemical studies on venting fluids from submarine plate boundaries (KAIKO-TOKAI Project)

海底板块边界排出流体的化学研究（KAIKO-TOKAI 项目）

基本信息

批准号：
08454163
负责人：
GAMO Toshitaka
金额：
$ 5.7万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08454163/
关键词：
Plate Boundary Hydrothermal fluid Cold Seepage Dissolved Gas Stable Isotope Ratio Submersible Observation Subduction Zone Mid-Oceanic Ridge ガスクロマトグラフ質量分析

项目摘要

Plate boundaries on the deep seafloor, such as mid-oceanic ridges and plate subduction zones, can be regarded as openings or windows through which much amount of chemical components comes up from or goes down to the earth interior chiefly by seawater convection. Since the venting fluids have quite different characteristiecs from ambient seawater, it is suggested that the fluids should bear significant parts of chemical flux between the ocean and the lithosphere. This study has paid attention to dissolved gas components, such as methane, helium, carbon dioxide etc. in venting fluids, because their concentrations and stable isotope ratios give us much useful information on the sources of the gases associated with pore fluid behaviors. As for the cold seepage at subduction zones, this study forms a part of Japan-France KAIKO-TOKAI Project which had been successfully conducted in the eastern Nankai Trough subduction zone between 1993 and 1997. We took many pore fluid samples and bottom seawaters for their chemical characterization. We have also promoted chemical investigations for submarine hydrothermal vents at various locations of mid-oceanic ridges (East Pacific Rise, Mid-Atlantic Ridge, Indian Ridge), back-arc basins (Okinawa Trough, Mariana Trough, Manus Basin), and arc volcanoes (Myojin Knoll). Accumulated data including time-series data have elucidated complicated chatacteristics of spatial and temporal variations of hydrothermal activity in the world. We have published 29 original papers on this project so far. These results of this study will play important role as preliminary databases for more detailed researches in the future.

大洋中脊和板块俯冲带等板块边界是地球内部化学物质主要通过海水对流进出的通道。由于火山喷发流体具有与环境海水完全不同的特征，因此，火山喷发流体应承担海洋与岩石圈之间化学通量的重要部分。本项研究关注了喷发流体中的溶解气体组分，如甲烷、氦、二氧化碳等，因为它们的浓度和稳定同位素比值为我们提供了与孔隙流体行为相关的气体来源的有用信息。关于俯冲带的冷渗漏，本研究是1993 - 1997年在南海海槽东部俯冲带成功进行的日法KAIKO-TOKAI项目的一部分。我们采取了许多孔隙流体样品和海底海水的化学特征。我们还促进了对大洋中脊（东太平洋海隆、大西洋中脊、印度洋海岭）、弧后盆地（冲绳海槽、马里亚纳海槽、马努斯盆地）和弧火山（妙神穹丘）不同地点海底热液喷口的化学调查。包括时间序列数据在内的大量资料揭示了全球热液活动时空变化的复杂特征。到目前为止，我们已经发表了29篇关于这个项目的原创论文。本研究的结果将作为未来更详细研究的初步数据库。