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.

深海深处的板块边界，例如中裂脊和板俯冲带，被视为开口或窗户，主要是通过海水对流从海水中出现或向下延伸到地球内部的开口或窗户。由于排气流体与环境海水具有截然不同的特征，因此建议流体应在海洋和岩石圈之间具有大部分化学通量。这项研究关注溶解的气体成分，例如甲烷，氦气，二氧化碳等，因为它们的浓度和稳定的同位素比为我们提供了与孔隙流体行为相关的气体来源的许多有用信息。至于俯冲带的冷渗水，这项研究构成了日本凯科tokai项目的一部分，该项目是在1993年至1997年之间在东南山槽俯冲带成功进行的。我们采用了许多孔隙液样品和底部海水的化学表征。我们还促进了在中大洋山脊（东太平洋上升，中大西洋山脊，印度山脊），后弧盆地（Oukinawa trough，Mariana trough，Mariana Trough，Manus Basin）和Arc Volcanoes（Myoojin Knoll）的各个位置（东太平洋山脊，中大西洋山脊，印度山脊）和弧形（Myoojin Knoll）的化学研究。包括时间序列数据在内的累积数据阐明了世界水热活动的空间和时间变化的复杂性语言。到目前为止，我们已经发表了29篇有关该项目的原始论文。这项研究的这些结果将作为未来更详细研究的初步数据库起重要作用。