Lithium Isotope Compositions of Volcanic Arc Lavas: A Study of Processes and Fluxes in Subduction Zones

火山弧熔岩的锂同位素组成：俯冲带过程和通量的研究

• 批准号: 9905540
• 负责人: Lui-Heung Chan
• 金额: $ 17.79万
• 依托单位: Louisiana State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-09-01 至 2004-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9905540&HistoricalAwards=false
• 关键词: Lithium; Isotope; Compositions; Volcanic; Arc

Funds that are provided will extend the use of the Lithium proxy to the arc systems. The objectives are to determine the isotopic variaion of Lithium in lavas as a funciton of the nature of subarc mantle, the extent of modification by subduction components, the mass transfer processes and the physical conditions of the subduction environment. In addition, sediment flux carried by the down-going plate will also be estimated to assess lithium recycling at the convergent margins. Samples from the Cascadia, Aleutian and Tonga-Kermadec Arcs will be analyzed.

所提供的资金将把锂代理的用途扩大到弧光系统。目的是确定熔岩中锂的同位素变化与弧下地幔的性质、俯冲成分的变质程度、质量传递过程和俯冲环境的物理条件的函数关系。此外，还将估计下行板块携带的沉积物通量，以评估收敛边缘的锂循环。将对卡斯卡迪亚、阿留申和汤加-克尔马德克弧区的样本进行分析。