Joint Study on the Geodynamics of Crustal Accretion

伸展的山脊现在被认为是影响整个地球的集中质量和能量交换的广泛领域。技术的进步为研究脊的科学冲动提供了强有力的支持。本项目的目的是作为日本与欧美国家的联合研究项目，开展洋中脊和弧后盆地地壳增生地球动力学的合作研究。虽然该项目被批准为为期一年的初步项目，但它为开展合作研究和加入InterRidge项目的国际规划活动提供了一个很好的机会。1991年11月在西雅图举行了脊峰过程时间变化观测讲习班。金泽博士出席了研讨会，并讨论了未来的研究计划和仪器的发展。Drs。藤井和加莫出席了1992年1月在美国亚利桑那州图森举行的RIDGE理论研究所，讨论了洋中脊和弧后盆地的热液和岩浆房过程的观测结果和理论。本项目课题组的几名成员在白虎丸号KH-92-1巡航期间对西太平洋的马里亚纳海槽和阿雨海槽进行了调查。美国国家海洋和大气管理局夏威夷分部的劳拉·孔博士受邀参加了马里亚纳海槽巡航，并参与了海脊分割的测深和地震调查。InterRidge计划是一项涉及大洋中脊各个方面的国际跨学科研究倡议，将于1992年3月在英国约克举行的第二次InterRidge会议上开始。Drs。玉木和藤本将出席会议，制定节目计划。通过为期一年的联合研究活动，为今后的扩展脊综合研究奠定了基础。

The spreading ridges are now recognized as an extensive province of focused mass and energy exchange that affects the entire earth. Technological progress has provided strong support for the scientific impulse to pursue investigations of the ridges. The objective of this program is to initiate cooperative researches of the geodynamics of crustal accretion in the mid-ocean ridges and back-arc basins as a joint research program among Japan and US/European countries.Although this program was approved as a one-year preliminary program, it has produced a good chance to initiate cooperative researches, and to join the international planning activities for the InterRidge program.A RIDGE workshop on observation of temporal variability of ridgecrest processes was held in November 1991 in Seattle. Dr. Kanazawa attended the workshop and discussed on future research programs and instrumental developments. Drs. T. Fujii and T. Gamo attended RIDGE Theoretical Institute held in January 1992 in Tucson, Arizona, and discussed on the observed results and theories of hydrothermal and magma chamber processes at mid-ocean ridges and back-arc basins.The Mariana Trough and Ayu Trough in the western Pacific were surveyed by several members of the research group of this program during the Hakuho-maru cruise KH-92-1. Dr. Laura Kong, NOAA in Hawaii, was invited to the Mariana Trough cruise and joined in the bathymetric and seismic survey of the ridge segmentation.The InterRidge program has been pursued as an international and interdisciplinary research initiative concerned with all aspects of midocean ridges, and is going to start at the 2nd InterRidge meeting held in March 1992 in York, UK. Drs. Tamaki and Fujimoto will attend the meeting to make a program plan. Owing to the one-year research activities under this joint program, the research group has made a ground for future integrated research programs of spreading ridges.