Isotopic and Trace Element Study in Mantle Materials

该奖项旨在支持以下领域的研究：1)铂族元素在合成熔体和晶体中作为fO2和fS2函数的分配和分布特征；2)进一步发展高效电离源Re-Os定年方法，并将其应用于地幔和地壳岩石和矿物；3)结合晶体化学模型，研究晶体-熔体平衡、带晶中微量元素的分布；4)对金刚石亚显微包裹体进行化学岩相学和同位素研究，确定被困地幔流体的性质和年龄，以及钾质包裹体与碳酸盐和水含量的相关性；5)超镁铁质中大离子亲石元素浓度分布及Sr、Nd、Pb同位素组成研究；6)用质谱法研究新鲜基性和超基性岩石中U-系不平衡和Th232/U238比值；7)测定CO2在合成硅酸盐熔体和新玻璃中的溶解度；8)研究了混合岩浆源岩石中Nd、Sr同位素模式和微量元素丰度的理论模型。大部分资金将用于研究生支持，包括他们所需的旅行和用品。

This award is for support of research in the following areas: 1) Partitioning and distribution characteristics of the platinum- group elements in synthetic melts and crystals as a function of fO2 and fS2; 2) further development of Re-Os dating using high efficiency ionization sources and the application of these procedures to mantle and crustal rocks and minerals; 3) The study of trace element distributions in crystal-melt equilibrium, in zoned crystals, in conjunction with crystal-chemical models; 4) The chemical-petrographic and isotopic study of submicroscopic inclusions in diamonds to determine the nature and age of trapped mantle fluids and the correlation of potassic inclusions with carbonate and water contents; 5) The study of the concentration and distribution of large ion, lithophile elements in ultramafics and the isotopic composition of Sr, Nd and Pb; 6) The study of U- series disequilibrium and Th232/U238 ratios in fresh basic and ultrabasic rocks using mass-spectrometric methods; 7) determination of the CO2 solubility in synthetic silicate melts and in recent glasses; and 8) The investigation of theoretical models to explain both Nd and Sr isotopic patterns and trace element abundances in rocks which represent mixed magma sources. Much of the funding will go for graduate student support, including the travel and supplies they will need.