Re-Os Investigations of Craton Development and Mantle Evolution

克拉通发育和地幔演化的Re-Os研究

• 批准号: 9204718
• 负责人: Steven Shirey
• 金额: $ 17.99万
• 依托单位: Carnegie Institution of Washington
• 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: 1992-07-15 至 1995-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9204718&HistoricalAwards=false
• 关键词: Re; Os; Investigations; Craton; Development

This project is to continue a series of Re-Os isotopic investigations designed to address the formation of Archean cratons; the composition and age of lithospheric mantle, the interaction between the lithosphere and asthenosphere and the chemical evolution of the mantle. Diverse samples of different ages will be analyzed: 1.8 - 3.3 Ga komatiites to basalts; 2.7-3.8 GA trondhjemites-tonalite-granodiorites; peridotitic mantle xenoliths; orogenic lherzolites; and continental mafic and alkalic lavas. Partitioning experiments for Re and Os between carbonatite-silicate liquids will be conducted to understand the behavior of Re and Os during mantle enrichment processes. The research will combine Re-Os isotopic data with data from one or more of these conventional isotopic systems (plus major and trace element data). Re and Os abundances and Os isotopic compositions will be analyzed at DTM by negative thermal ionization mass spectrometry (NTIMS). The results should not only shed new light on crust-mantle relationships, but also contribute significantly to the development of a new and exciting analytical technique.

本项目是为了继续进行一系列的Re-Os同位素 旨在解决太古代形成的调查 岩石圈地幔的组成和年龄， 岩石圈与软流圈的相互作用 地幔的化学演化 不同的样品 年龄分析：1.8 - 3.3 Ga科马提岩到玄武岩; 2.7-3.8 Ga GA奥长英云闪长岩-花岗闪长岩;橄榄岩地幔 包体;造山二辉橄榄岩;大陆镁铁质和碱性 熔岩 Re和Os的分配实验 碳酸盐硅酸盐液体将进行了解 地幔富集过程中Re和Os的行为。 的 研究将把联合收割机铼-锇同位素数据与一个或多个国家的数据结合起来， 更多的这些常规同位素系统（加上主要和痕量 元素数据）。 Re、Os丰度和Os同位素组成 将在DTM通过负热电离质量进行分析 光谱法（NTIMS）。 研究结果不仅能让我们 对壳幔关系的影响， 一种新的令人兴奋的分析技术的发展。