Isotopic Studies of Oceanic Mantle and Oceanic Crust

大洋地幔和洋壳的同位素研究

• 批准号: 9017833
• 负责人: Mark Kurz
• 金额: $ 23万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-03-01 至 1993-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9017833&HistoricalAwards=false
• 关键词: Isotopic; Studies; Oceanic; Mantle; Crust

The goal of ths research is to use nobel gases to constrain thenature and origin of mantle heterogeneities. The controversy regarding the extent to which helium isotopes are decoupled from the other isotopic tracers by magma chamber proceses will be tested by measurements of He/(Th+U) ratios and by measurements of He,Sr,Nd, and Pb isotopes in the same samples. The research will help constrain the origin of the variability on different time and length scales, and also resolve some of the controversy regarding the interpretation of low 3He/4He ratios in oceanic rocks. New measurements will be made on samples from ocean islands and ridges that are geologically well constrained.

研究的目的是使用诺贝尔气体来限制地幔异质性的当时和起源。岩浆腔室垫与其他同位素示踪剂与其他同位素示踪剂分解的争议将通过测量HE/（Th+U）比和HE，SR，SR，ND和PB同位素的测量结果来测试。这项研究将有助于限制不同时间和长度尺度上的可变性的起源，并解决有关海洋岩石中低3HE/4HE比率解释的一些争议。将对来自海洋岛和山脊的样品进行新的测量，这些样品在地质上受到良好的约束。