Joint Study on the Geodynamics of Crustal Accretion

扩张的海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区域。技术进步为对海脊进行调查的科学冲动提供了强有力的支持。该计划的目标是启动大洋中脊和弧后盆地地壳增生地球动力学的合作研究，作为日本和美国/欧洲国家的联合研究计划。虽然这一计划被批准为为期一年的初步计划，但它为发起合作研究和参加国际脊间计划活动提供了一个很好的机会。1991年11月，在西雅图举行了观察山脊过程时间变异性的山脊研讨会。金泽博士出席了研讨会，并讨论了未来的研究计划和仪器开发。T.Fujii博士和T.Gamo博士参加了1992年1月在亚利桑那州图森市举行的海岭理论研究所会议，讨论了大洋中脊和弧后盆地的热液和岩浆室过程的观测结果和理论。该项目的几名研究小组成员在白宇KH-92-1号巡航期间对西太平洋的马里亚纳海槽和阿尤海槽进行了勘察。夏威夷NOAA的Laura Kong博士应邀参加了马里亚纳海槽邮轮，并参与了对海脊分段的水深和地震调查。海脊间计划一直是一个国际性和跨学科的研究计划，涉及大洋中脊的所有方面，并将于1992年3月在英国约克举行的第二届国际海脊会议上开始。玉木博士和藤本博士将出席会议，制定项目计划。由于在这一联合计划下进行了为期一年的研究活动，该课题组为未来的综合扩脊研究计划奠定了基础。

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.