Collaborative Research: 10Be and 9Be in Volcanic Arc Lavas: Investigation of Sediment Recycling

合作研究：火山弧熔岩中的 10Be 和 9Be：沉积物回收研究

• 批准号: 8720829
• 负责人: Roy Middleton
• 金额: --
• 依托单位: University of Pennsylvania
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-02-01 至 1990-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8720829&HistoricalAwards=false
• 关键词: Collaborative; Research; 10Be; 9Be; Volcanic

Recent measurements of Be-10 in ~250 volcanic rocks from various geologic settings indicate that that young, near-surface oceanic sediments are subducted and incorporated in arc magmas in the Kurile, Aleutian, Central America, Peru-Chile and New Britain arcs. Integration of Be-10 data with geophysical and structural studies of convergent margins suggests that sedfiments may be subducted in grabens in the subducting plate, as Be-10 concentrations an arc lavas are highest where the pelagic sediment thickness approximately equals vertical displacement of the down- dropped basins. Recent improvements in the University of Pennsylvania accelerator permit smaller samples to be analyzed more precisely, and the recent acqusition of an I.C.P. spectrometer at Carnegie permits measurement of Be-9. This project is to measure Be-10/Be-9 ratios and Sr, Nd and Pb isotopic compositions for mineral seperates, new volcanic arc lavas, and a subset of the existing sample collection. Wherever possible results will be combined with other geochemical studies and evaluated in the context of geophysical studies in order to arrive at an integrated model of sediment subduction and recycling at volcanic arcs.

最近对来自不同地质环境的约 250 块火山岩中 Be-10 的测量表明，年轻的近地表海洋沉积物俯冲并融入千岛岛弧、阿留申群岛、中美洲、秘鲁-智利和新不列颠岛弧的弧岩浆中。 Be-10 数据与汇聚边缘的地球物理和结构研究相结合表明，沉积物可能在俯冲板块的地堑中俯冲，因为弧熔岩中的 Be-10 浓度最高，其中远洋沉积物厚度大约等于向下的垂直位移。掉下脸盆。 宾夕法尼亚大学加速器的最新改进允许更精确地分析较小的样品，并且最近获得的 I.C.P. 卡内基的光谱仪可以测量 Be-9。 该项目旨在测量矿物分离物、新火山弧熔岩以及现有样品集合的子集的 Be-10/Be-9 比率以及 Sr、Nd 和 Pb 同位素组成。 只要有可能，结果将与其他地球化学研究相结合，并在地球物理研究的背景下进行评估，以便得出火山弧沉积物俯冲和再循环的综合模型。