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International Cooperative Research on the Mid-Ocean Ridges

大洋中脊国际合作研究

基本信息

批准号：
06044050
负责人：
FUJIMOTO Hiromi
金额：
$ 9.28万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

This research program aims international scientific joint researches on the seafloor spreading system in the framework of the IntrerRidge Program, which is an international initiatives to unveil the interdisciplinary activities of the global mid-ocean ridge system.Cooperative researches were carried out in this fiscal year on board five foreign cruises. Three were focused on analysis of seafloor magnetic structures with a shipboard three-component magnetometer (STCM) developed in Japan. Main results are (1) age-dependent variation in the effective depth of the magnetic layr off the West Coast of USA (Melville, USA), (2) variation in discontinuity structures in the slow-spreading Southwestern Indian Ridge (I'Atalante, France), and (3) relationship between magnetic intensity and rock minerals on the fast-spreading Pacific-Antarctic Ridge south of New Zealand (I'Atalante, France). Other two cruises aimed at searching for hydrothermal activities (4) on the Central Indian Ridge (Sonne, Germany), and (5) in the Derugin Basin in the Okhotsk Sea (Gagarinski, Russia). Active vent site still have not been found in the Indian Ocean. Surveys were also carried out on land in Oman ophiolites and found a structure indicating ridge propagation.Another activities supported by this program are participation in the planning activities mainly for for InterRidge Phase-II program. Dr.Tamaki is a member of InterRidge Steering Committee and will lead the planning activities related with back-arc basin researches and construction of midocean ridge digital data bases. Dr.Fujimoto, a member of SCOR WG99 at linked mass and energy fluxes at ridge crests, joined the activities and worked to publish a SCOR WG pamphlet.Another important aspect of this program is to have broaden the scientific community in our country. Big joint sessions on the Earth's spreading systems have been held in the Geophysical Joint Spring Meeting in Japan.

本研究项目是在国际上开展的旨在揭示全球大洋中脊系统跨学科活动的国际倡议----国际大洋中脊计划（IntrerrRidge Program）的框架内，对海底扩张系统进行国际科学合作研究的项目。三个项目侧重于用日本研制的船载三分量磁力计分析海底磁结构。主要结果是（1）美国西海岸（梅尔维尔，USA）磁层有效深度随年龄的变化，（2）缓慢扩张的西南印度洋海岭（I 'Atalante，France）不连续结构的变化，（3）新西兰南部快速扩张的太平洋-南极海岭（I' Atalante，France）磁场强度与岩石矿物的关系。另外两次航行的目的是寻找热液活动：（4）在中印度洋洋脊（索内，德国），（5）在鄂霍次克海的德鲁金盆地（Gagarinski，俄罗斯）。在印度洋仍然没有发现活跃的喷口。还对阿曼的海蛇海进行了调查，发现了一个表明海脊扩展的结构，该方案支助的另一项活动是参与主要是国际海脊协会第二阶段方案的规划活动。玉木博士是国际大洋中脊指导委员会的成员，将领导与弧后盆地研究和建立大洋中脊数字数据库有关的规划活动。藤本博士是SCOR WG 99的成员之一，他在海脊顶部的质量和能量通量联系方面参加了活动，并致力于出版SCOR工作组的小册子。该计划的另一个重要方面是扩大我国的科学界。在日本举行的地球物理联合春季会议上举行了关于地球扩张系统的大型联合会议。