Petrogenesis of Diamonds and Their Host Xenoliths

泰勒这项研究采用综合方法研究西伯利亚雅库特地区钻石及其宿主捕虏体的年龄、形成和演化。三颗精心挑选的含钻石榴辉岩捕虏体和两颗大钻石（切割成10克拉的板块）将被用作地球地幔演化的记录仪。金刚石中的矿物包裹体被认为是金刚石形成过程中地幔条件的可靠指标，因为这些包裹体是从金刚石形成后的地幔过程中分离出来的。由于单个钻石内的矿物包裹体可能是可变的，因此记录包裹体如何适应钻石的生长历史是很重要的。该研究将首次对钻石包裹体进行全面的地球化学和岩石学研究，将钻石的化学特征与钻石的生长历史联系起来。这将包括在研究捕虏体和包裹体之前对钻石进行阴极发光和碳、氮同位素分析。捕虏体将通过x射线计算机断层扫描成像，在分解之前，检查钻石-宿主的纹理关系。矿物包裹体和宿主捕虏体矿物将通过各种技术进行研究：硅酸盐的主要元素和微量元素以及O同位素分析；硫化物的Re-Os和S同位素分析。这项对钻石、包裹体矿物和宿主捕虏体的综合研究将对了解钻石形成所需的地幔条件和西伯利亚地台下地幔的演化做出重大贡献。

9725885TaylorThis research involves an integrative approach to the study of the age, formation and evolution of diamonds and their host xenoliths form Yakutia, Siberia. Three carefully chosen diamond-bearing eclogite xenoliths and two large diamonds (cut into 10 carat plates) will be used as recorders of the evolution of the Earth's mantle. Mineral inclusions within diamonds are considered reliable indicators of mantle conditions during diamond formation because these inclusions were isolated from post-diamond formation mantle processes. Since mineral inclusions within a single diamond can be variable it is important to document how the inclusions fit within the growth history of the diamond. This research will provide the first comprehensive geochemical and petrologic study of inclusions within diamonds that links the chemical characteristics to the diamond growth history. This will involve cathodoluminescence and C and N isotopic analyses of the diamonds prior to the study of the xenoliths and inclusions. The xenoliths will be imaged by X-ray computed tomography, prior to disaggregation, to examine the diamond-host textural relationships. Mineral inclusions and host xenolith minerals will be studied by a variety of techniques: major and trace element and O isotopic analyses of silicates; and Re-Os and S isotopic analyses of sulfides. This integrated study of diamonds, inclusion minerals and host xenoliths will make a significant contribution to the knowledge of mantle conditions necessary for diamond formation, and the evolution of the mantle beneath the Siberian Platform.