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.

该研究计划旨在在IntrerRidge计划的框架内对海底扩张系统进行国际科学联合研究，该计划是一项旨在揭示全球洋中脊系统跨学科活动的国际倡议。本财年开展了以下合作研究：登上五艘外国游轮。其中三项重点是使用日本开发的船载三分量磁力计（STCM）对海底磁结构进行分析。主要结果是（1）美国西海岸（美国梅尔维尔）磁层有效深度随年龄的变化，（2）缓慢扩张的西南印度洋中脊（I'Atalante，法国），以及（3）新西兰南部快速扩张的太平洋-南极海脊（I'Atalante，法国）上磁场强度与岩石矿物之间的关系。另外两艘巡航旨在寻找热液活动（4）在中印度海岭（德国索讷），以及（5）在鄂霍次克海德鲁金盆地（俄罗斯加加林斯基）。印度洋尚未发现活跃的喷口位点。还在阿曼蛇绿岩的土地上进行了调查，发现了表明山脊传播的结构。该计划支持的另一项活动是参与主要针对 InterRidge 第二阶段计划的规划活动。 Tamaki博士是InterRidge指导委员会的成员，将领导与弧后盆地研究和洋中脊数字数据库建设相关的规划活动。藤本博士是SCOR WG99的成员，负责脊顶链接质量和能量通量，他参加了这些活动并致力于出版SCOR WG小册子。该计划的另一个重要方面是扩大了我国科学界的范围。在日本举行的地球物理联合春季会议上召开了有关地球扩张系统的大型联合会议。