26A1/10Be and 7Be/9Be/10Be Systematics in the Marine Environment

海洋环境中的 26A1/10Be 和 7Be/9Be/10Be 系统学

• 批准号: 9202789
• 负责人: Teh-Lung Ku
• 金额: $ 35.8万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-04-15 至 1994-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9202789&HistoricalAwards=false
• 关键词: 26A1; 10Be; 7Be; 9Be; Systematics

Radioisotopes of beryllium (10Be and 7Be) and aluminum (26Al) are produced by the interaction of cosmic rays with atoms in the atmosphere and on the Earth's surface. They enter the ocean via wet/dry fallout, and in the case of 26Al, via aeolian transport to a certain extent as well. They have different half-lives. They and their stable counterparts, 9Be and 27Al, have varied geochemical source functions, behavior, and pathways, yet are linked in some way through isotopic kinships. Together, they can be used as powerful time an process tracers for a number of oceanographic and geophysical problems such as marine geochronology, ocean mixing, past and present intensity of dust transport and ocean margin productivity, and aerosol behavior. The improvement of measurement techniques of these isotopes in recent years allows the potential of their tracer utility to be explored. The basic distributional features and geochemical behavior of 10Be and 9Be in the ocean-atmosphere system has been studied. This past effort is now extended to the study of 26Al, as data base on this isotope in the ocean borders on virtual non- existence. Measurements will be made of 26Al/10Be and 7Be/10Be in seawater, and 26Al/10Be,10Be/9Be and 26Al/27Al in authigenic phases of deep-sea sediments and ferromanganese deposits. From the measurement will come: (1) better understanding of the comparative marine geochemistry of 26Al and 10Be, (2) refinement of the geochronology with 10Be/9Be, (3) evaluation of the absolute dating method of 26Al/10Be, (4) estimation of the input of the land- originated 26Al to the ocean, and (5) exploration of the possibility of using the isotope systems to trace past variations in ocean circulation and atmospheric dust transport.

铍（10 Be和7 Be）和铝（26 Al）的放射性同位素是 由宇宙射线与宇宙中的原子相互作用产生 大气层和地球表面。 它们进入海洋， 湿/干沉降物，在26 Al的情况下，通过风成输运至 在一定程度上也是。 它们有不同的半衰期。 他们 它们的稳定对应物9 Be和27 Al具有不同的地球化学特征， 源功能，行为和途径，但在一些 通过同位素亲缘关系 它们可以一起用作 强大的时间过程追踪器可以追踪许多海洋学和 地球物理问题，如海洋地质年代学，海洋混合， 过去和现在的沙尘输送强度和海洋边缘 生产率和气溶胶行为。 这些同位素测量技术的改进， 近年来，允许他们的跟踪效用的潜力， 探讨了 基本分布特征及地球化学特征 10 Be和9 Be在海-气系统中的行为， 研究了 过去的努力现在扩展到26 Al的研究， 海洋中这种同位素的数据库几乎没有 存在 将对26 Al/10 Be和7 Be/10 Be进行测量， 海水、26 Al/10 Be、10 Be/9 Be和26 Al/27 Al的自生相 深海沉积物和铁锰矿床。 从 测量将带来：（1）更好地了解比较 26 Al和10 Be的海洋地球化学;（2） ~（10）Be/~（90）Be年代学;（3）绝对定年 26 Al/10 Be法;（4）土地投入量估算; 26 Al起源于海洋;（5）探讨26 Al起源于海洋的可能性 利用同位素系统来追踪海洋过去的变化 环流和大气尘埃输送。