Rhenium-Osmium Isotope Study of the Mantle

9526329步行者尽管它在理解地球的化学演化的重要性，地幔的Os同位素组成是很差的约束。 这是继续表征的Os同位素组成的各种地幔域通过时间，通过分析的超镁铁岩，否则地球化学和同位素特征良好，并具有相对较高的Os浓度和低Re/Os比。 分析的具体目标将是代表海洋岩石圈上部物质的超镁铁质岩浆系统，以及来自可能的地幔柱的物质。 将对每个地点的整个岩石样品和矿物分离物进行分析。 由此产生的信息应导致：1）更好地了解如何在地幔柱和上地幔储层的Os演变，和2）提供见解Re和Os在这些类型的岩石中的位置，以及什么阶段或阶段组合提供了最有用的信息有关的初始同位素组成。

9526329 Walker Despite its importance in understanding the chemical evolution of the Earth, the Os isotopic composition of the mantle is poorly constrained. This is to continue characterization of the Os isotopic composition of various mantle domains through time, via the analysis of ultramafic rocks that are otherwise geochemically and isotopically well-characterized, and that have relatively high Os concentrations and low Re/Os ratios. Specific targets for analysis will be ultramafic magmatic systems that represent upper oceanic lithospheric materials, and materials derived from likely mantle plumes. Both whole rock samples and mineral separates will be analyzed from each location. The resulting information should lead to: 1) a better understanding of how Os has evolved in plume and upper mantle reservoirs, and 2) provide insights into where Re and Os are sited in these types of rocks and what phases or combination of phases provide the most useful information about initial isotopic compositions.