Deep Ocean Tracers and Hydrothermal Vents

克雷格博士在这个项目中的研究一直受到关注 与热液喷口的挥发分和同位素化学 沿着大洋中脊扩张中心， 这些液体进入深海， 循环通过使用这些示踪剂（3 He）结合自然 放射性同位素 在过去的两年里，他 将已知的热液喷口延伸到 西南太平洋的弧后盆地（劳、北斐济和马努斯 盆地），西太平洋马里亚纳海槽，以及 火山热点，如夏威夷的Loiji海山 热点，以及东太平洋隆起在帕斯夸热点的喷口， 东部的微型板 今年在两个阿尔文潜水计划 他曾在洛伊希火山口的30摄氏度火山口和285摄氏度火山口 （“清晰的吸烟者”）在我们发现的两个主要热液区 在马里亚纳海槽 在1987年底之前，他将管理一个 考察样带横跨两个太平洋纬向氦喷流， 北太平洋和南太平洋，开始详细测绘 这些深太平洋环流的主要特征，新 这里报告的结果包括3 He，CH 4和Mn的详细信息 莫尔、热点和弧后喷口的关系，放射性碳 热液中的稳定碳同位素39 Ar、N和O N2 O中的同位素等。详细的77页数据报告， 太平洋海盆研究（Papatua考察）已经印发。 1987年以后没有新的探险工作计划， 两年 相反，他打算完成所有的分析， 在1986-87年的考察样品和ALVIN计划上工作， 并且集中于莫尔的解释和合成， 热点、弧后和深海同位素和化学 问题研究

Dr. Craig's research in this program has been concerned with the colatile and isotopic chemistry of hydrothermal vents along the Mid-ocean Ridge spreading centers, the fluxes of these fluids into the deepsea, and the study of the deep circulation by use of these tracers (3He) combines with natural radioactive isotopes. During the past two years he has extended the known occurrences of hydrothermal vents to the Back-arc basins of the SW Pacific (Lau, North Fiji, and Manus Basins), to the western Pacific in the Mariana Trough, and to volcanic hotspots such as Loiji Seamount on the Hawaiian hotspot, and East Pacific Rise vents at the Pascua hotspot on the Eastern microplate. This year in two ALVIN diving programs he has sampled 30'C vents in Loihi caldera, and 285'C vents ("clear smokers") in two major hydrothermal areas we discovered in the Mariana Trough. Before the end of 1987 he will run an expedition transect across the two Pacific zonal helium jets in the North and South Pacific, to begin the detailed mapping of these major features of the deep Pacific circulation, New results reported here include details of the 3He, CH4, and Mn relationships in MOR, Hotspot, and Back-arc vents, radiocarbon and stable carbon isotopes in vent fluids, 39Ar and N and O isotopes in N2O, etc. A detailed 77-page Data Report on the SW Pacific Basin studies (Papatua Expedition) has been issued. No new expedition work is planned after 1987, for the next two years. Rather, he intends to complete all the analytical work on the expedition samples and ALVIN programs of 1986-87, and to concentrate on onterpretation and synthesis of the MOR, hotspot, Back-arc, and deep-ocean isotopic and chemical studies.