US-France Cooperative Research: The Geochemistry of The Beryllium Isotopes

美法合作研究：铍同位素的地球化学

• 批准号: 8816770
• 负责人: John Edmond
• 金额: $ 1.13万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-03-01 至 1991-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8816770&HistoricalAwards=false
• 关键词: US; France; Cooperative; Research; Geochemistry

This award will support collaborative research between Dr. John Edmond and his research group at the Massachusetts Institute of Technology and Dr. Grant Raisbeck, Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse, Orsay, France. The objective of the proposed project is the investigation of the geochemistry of the isotopes of beryllium with a view to using Be-10 as a dating tool, similar to Carbon 14. The long lived isotope Be-10 is produced by cosmic ray induced spallation reactions in the atomosphere and in the upper meters of the earth's surface. The stable isotope Be-9 is derived from the weathering of rocks. If the isotopes behave coherently in the cycles of transport and deposition, then the Be-10/Be-9 couple can be used for dating in a manner analogous to Carbon 14/Carbon 12. However the time scales would be much longer, i.e. 10 million years as opposed to 50 thousand. In addition, Be-10 produced in rocks by cosmic ray bombardment could be used to date the exposure of the rock. In this project, sample collection and preparation, principally from the Orinoco Basin in Venezuela, will be the responsibility of the MIT group. Both the U.S. and French groups have extensive expertise in the geochemistry of Be-9. Results of this research may provide valuable information on the potential uses of Be-10 as a geochronometer.

该奖项将支持约翰博士之间的合作研究 埃德蒙和他在马萨诸塞州研究所的研究小组 技术和Grant Raisbeck博士，光谱测量中心 原子核和质量光谱，奥赛，法国。 的 拟议项目的目标是调查 铍同位素地球化学 Be-10是一种测年工具，类似于碳14。 长寿者 同位素Be-10是由宇宙射线诱发的溅射产生的 大气层和地球上层的反应 面 稳定同位素Be-9来源于 岩石化学分析方法 如果同位素在循环中表现一致， 输运和沉积，则Be-10/Be-9对可用于 以类似于碳14/碳12的方式测年。 然而 时间尺度会更长，即1000万年， 而不是5万。 此外，Be-10在岩石中产生， 宇宙射线的轰击可以用来确定 岩石 在本项目中，样品采集和制备，主要 从委内瑞拉奥里诺科河盆地，将负责 麻省理工学院的团队 美国和法国集团都拥有广泛的 Be-9的地球化学专业知识 这项研究成果 可能提供关于Be-10潜在用途的宝贵信息， 地质年代计