CSEDI Collaborative Research: The 190Pt-1860s System as a Test of Core-Mantle Interaction: Phase III

9809451沃克第三阶段的这个项目是一个合作，多学科的早期工作的延伸。 PI将联合收割机同位素地球化学与实验岩石学/地球化学相结合。 目标是：1）继续精确测量各种可能的地幔岩的186 Os/188 Os，对于这些岩石，Pb-Os关系表明非地壳187 Os富集物质的参与，并评估186 Os和187 Os富集之间是否存在正相关关系。 2)实验研究分配的Pt，Re和Os之间的液体和固体金属相在越来越高的压力和温度。 这项研究的目标是评估是否Pt，Re和Os的分配行为在较大的行星体，因为他们在小行星的核心。 3)精确和准确地测量各种地幔和地壳物质中可能再循环到地幔中的Pt和Pt/Os的浓度。 这方面的研究的目的是证实或否定的初步证据表明，地壳物质再循环到地幔的幔-壳混合物的Pt/Os的比例几乎没有影响。

9809451Walker 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.