CESEDI Collaborative Research: On the 190Pt-186Os System as a Test of Core-Mantle Interaction: Phase III

9809569步行者项目的第三阶段是早期工作的协作性、多学科延伸。PI将把同位素地球化学与实验岩石学/地球化学结合起来。目标是：1)继续精确测量各种可能来自羽流的岩石的186Os/188Os，其中铅-Os关系表明其涉及非地壳187Os富集物，并评估186Os与187Os富集度之间是否存在正相关关系。2)实验研究了在越来越高的压力和温度下，铂、Re和Os在液态和固态金属相间的分配。这项研究的目的是评估铂、Re和Os在较大行星体内的分配行为是否与在小行星核心中的行为相同。3)准确、准确地测量各种地幔和可能再循环到地幔中的地壳物质中的铂和铂/Os的浓度。这方面研究的目的是确认或否认初步证据，即地壳物质进入地幔的再循环对地幔-地壳混合物的铂/Os比值影响不大。

9809569Walker Phase III of this project is a collaborative, multidisciplinary extension of earlier work. The PI's will combine isotope geochemistry with experimental petrology/geochemistry. Objectives are to: 1) Continue to precisely measure the 186Os/188Os of a variety of possibly plume-derived rocks for which Pb-Os relations suggest the involvement of non-crustal 187Os-enriched materials, and assess if there is a positive relation between 186Os and 187Os enrichment. 2) Experimentally examine the partitioning of Pt, Re and Os between liquid and solid metal phases at increasingly higher pressures and temperatures. The goal of this research is to assess whether the partitioning of Pt, Re and Os behave in larger planetary bodies as they do in asteroidal cores. 3) Precisely and accurately measure the concentrations of Pt and Pt/Os in a variety of mantle and crustal materials that may be recycled into the mantle. The goal of this aspect of the research is to confirm or deny the preliminary evidence that suggests recycling of crustal materials into the mantle little affects the Pt/Os ratio of mantle-crust mixtures.