Li Isotopic Investigations of the Crust and Mantle

鲁德尼克0106719这个试点项目将表征地幔的锂同位素组成。本项目将致力于将Li溶液和激光引入我们的Nu等离子体多收集器电感耦合等离子体质谱中。我们将从分析溶液中的国际岩石标准开始，然后从橄榄岩(橄榄石、斜辉石和单斜辉石)中分离出矿物。我们的最终目标是确定来自不同年龄和构造环境的岩石圈中的各种橄榄岩包体在地球地幔中Li同位素的范围，这些包体经历了不同的交代叠加过程。此外，我们希望确定共存相之间的同位素不均匀程度。

Rudnick0106719This pilot project will characterize the Li isotopic composition of the Earth's mantle. This project will concentrate on both solution and laser introduction of Li to our Nu plasma multicollector ICP-MS. We will begin by analysing international rock standards in solution, then will proceed with mineral separates from peridotites (olivine, orthopyroxene and clinopyroxene). Our ultimate goal is to determine the range of Li isotope values in the Earth's mantle, as sampled by a variety of peridotitic xenoliths derived from lithosphere of variable ages and tectonic settings that have experienced a variety of metasomatic overprinting processes. In addition, we hope to establish the degree of isotopic heterogeneity between coexisting phases.