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

本研究的主要目的是调查再- 上地幔中的Os系统学及其性质 地幔中产生锇同位素变化的过程。 为了实现这些目标，PI将实施两阶段 研究计划。 首先，他们将扩大 通过分析OIB中的Os同位素比值， 冰岛、夏威夷、圣赫勒拿岛和 加那利群岛。 其次，他们将调查 蚀变地壳的同化作用可能对 通过比较确定OIB的Os同位素组成 分化和未分化的Re-Os系统学 玄武岩，并通过直接表征蚀变海底 玄武岩剖面

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.