Joint Study on the Geodynamics of Crustal Accretion

扩张的海脊现在被认为是一个广泛的集中质量和能量交换的区域，影响着整个地球。技术进步为对海脊进行研究的科学冲动提供了强有力的支持。该项目的目的是作为日本和美国/欧洲国家的联合研究项目，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。虽然该项目被批准为一年的初步项目，但它为启动合作研究提供了一个很好的机会，1991年11月在西雅图举行了一次关于观测里奇克雷斯特过程的时间变化的国际地理信息系统研究所讲习班。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。T医生Fujii和T. 1992年1月，参加了在亚利桑那州图森市举行的RIDGE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房过程的观测结果和理论。该项目的研究小组的几名成员在“白河丸”号（KH-92-1）考察中对西太平洋的马里亚纳海槽和阿尤海槽进行了调查。夏威夷海洋大气署的Laura Kong博士应邀参加了马里亚纳海槽航行，并参加了海脊分段的测深和地震调查，国际大洋中脊方案一直作为一项国际和跨学科的研究倡议，涉及迈阿密海脊的所有方面，将于1992年3月在联合王国约克举行的第二次国际大洋中脊会议上开始。玉木博士和藤本博士将出席会议，制定项目计划。由于这项合作计划下为期一年的研究活动，研究小组为未来的扩张脊综合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.