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A study of the Arctic Ridge process

北极海脊过程研究

基本信息

批准号：
11304024
负责人：
TAMAKI Kensaku
金额：
$ 24.87万
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 (A)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11304024/
关键词：
mid-ocean ridges plate tectonics hydrothermal activity Arctic Ocean ブレートテクトニクス

项目摘要

The purpose of the project is to understand the mid-ocean ridge process at ultra-slow spreading system in the Arctic Ocean. We conducted an international and interdisciplinary cruise in the second year of the project and obtained high-resolution sonar images along the ultra-slow spreading ridge as well as other datasets.The pre-cruise meetings were held in St. Petersburg in early 2000, and the original science plan was devised to focus research at the Knipovich Ridge using the R/V Professor Logachev (VNIIO, St. Petersburg, Russia, 5620 t). The research strategy consists of an along-axis towing of deep-tow side scan sonar with additional self-recording instruments (light scattering sensor, CTD, magnetometer and pH meter), geophysical measurements (magnetics, heat flow, seismicity) and bottom and water sampling. Scientists from Japan, Russia, USA, UK, Norway, China, Taiwan and Korea participated the cruise. During the cruise on the Knipovich Ridge (Knipovich-2000 cruise), we acquired a 400 km-long profile of the axial valley, 〜75% of the ridge. We detected a few thermal and chemical anomalies along the sonar profile, indicating the existence of the hydrothermal activity. Rock and sediment samples were also collected. We deployed 10 ocean bottom seismometers to detect micro earthquakes in the volcanically active area and recovered them after one-month observation.The last year of the project (2001) was devoted to analyze the data and to prepare publications. Preliminary results were reported in the Japan Earth and Planetary Science Joint Meeting (Tokyo, 2001). An international post-cruise meeting was held in St. Petersburg, in November, 2001, to synthesize the results. A paper on the segmentation of the ridge has been submitted to an international journal and other results will be submitted to the appropriate journals within a year.

该项目的目的是了解北冰洋超慢速扩张系统中的洋中脊过程。在项目的第二年，我们进行了一次国际和跨学科的巡航，并获得了沿着超慢速扩张脊的高分辨率声纳图像以及其他数据集。2000年初，在彼得堡举行了巡航前会议，并制定了最初的科学计划，利用R/V Logachev教授将研究重点放在Yuppovich海岭（VNIIO，俄罗斯彼得堡，5620吨）。研究战略包括沿轴拖曳深拖侧扫声纳，并配备额外的自记仪器（光散射传感器、CTD、磁力计和pH计）、地球物理测量（磁力、热流、地震活动）以及海底和水取样。来自日本、俄罗斯、美国、英国、挪威、中国、台湾和韩国的科学家参加了这次巡航。我们在波波维奇海岭巡航期间（波波维奇-2000巡航），获得了400公里长的轴向谷剖面，占海岭的75%。我们探测到一些热和化学异常沿着声纳剖面，表明热液活动的存在。还收集了岩石和沉积物样本。我们部署了10个海底地震仪，在火山活跃区探测微地震，并在一个月的观测后恢复了它们。项目的最后一年（2001年）专门用于分析数据和编写出版物。日本地球和行星科学联席会议（2001年，东京）报告了初步结果。2001年11月在彼得堡举行了一次国际考察后会议，以综合研究结果。已向一份国际期刊提交了一篇关于海脊分割的论文，其他成果将在一年内提交给适当的期刊。