Re-Os Systematics in the Earth's Mantle: Evidence from Mantle-Derived Basalts and Ultramafic Nodules

这项研究的主要目的是研究上地幔中的Re-Os系统学，以及在地幔中产生Os同位素变化的过程的性质。为了实现这些目标，私家侦探们将实施一个分两个阶段的研究计划。首先，他们将通过分析来自冰岛、夏威夷、圣赫勒拿和加那利群岛的精选玄武岩，扩大大洋钻探中Os同位素比率的特征。其次，他们将通过比较分异玄武岩和未分异玄武岩的Re-Os系统学，以及通过直接表征蚀变的海底玄武岩剖面，来研究蚀变地壳的同化作用在确定OIB的Os同位素组成中的重要程度。

The principal goals of this research are to investigate Re- Os systematics in the upper mantle and the nature of processes that produce Os isotopic variations in the mantle. To achieve these goals, the P.I.s will implement a two-phase research program. First, they will expand the characterization of Os isotope ratios in OIBs by analyzing selected basalts from Iceland, Hawaii, St. Helena and the Canary Islands. Second, they will investigate the extent to which assimilation of altered crust may be important in determining the Os isotopic composition of OIBs by comparing Re-Os systematics in differentiated and undifferentiated basalts, and by direct characterization of altered submarine basalt sections.