The Origin and Evolution of Mantle Plumes

这是一个分析程序，将产生一系列关键地幔柱的综合数据集。这一组将包括放射性同位素比率（Sr， Nd和Pb），微量元素（Rb, Cs, Sr, Ba，稀土，Y, Zr, Nb, Hf, Ta， U, Th, Pb，所有第一过渡金属，可能还有Li， Be, As, Mo, Tl, Sn， Sb和W），氧和硼的稳定同位素比率，以及主要元素。这项工作将集中在已经分析了许多元素和同位素的样本上；因此，它更多地是在努力使现有数据集复杂化，而不是产生新的数据集。将从文献中收集现有数据，过滤其质量，并建立一个关于海洋岛屿和岛弧火山的广泛的地球化学数据库，作为分析工作的补充。根据得到的数据集，将尝试回答以下问题：(1)3个主要地幔柱类的微量元素和稳定同位素特征是什么？(2)在地幔柱储层地球化学演化过程中，各种源的相对贡献是什么？(3)岩石圈循环发生的时间尺度是什么？(4)上述物质在羽流中的比例是多少？(5)所有羽流中是否存在共同成分？

9418398 White This is an analytical program that will produce a comprehensive data set on a number of key mantle plumes. This set will include radiogenic isotope ratios (Sr, Nd, and Pb), trace elements (Rb, Cs, Sr, Ba, rare earths, Y, Zr, Nb, Hf, Ta, U, Th, Pb, all the first transition metals, and possibly Li, Be, As, Mo, Tl, Sn, Sb, and W), stable isotope ratios of oxygen and boron, and major elements. The effort will focus on samples that have already been analyzed for a number of elements and isotopes; it is thus more an effort at complexing existing data sets rather than producing new ones. The analytical effort will be complimented by harvesting existing data from the literature, filtering it for quality, and creation of a n extensive geochemical database on oceanic island and island arc volcanics. From the resulting data set, an attempt will be made to answer the following questions: (1) What are the trace element and stable isotope characteristics of the 3 principal mantle plume classes? (2) What is the relative contribution of various sources in the geochemical evolution of mantle plume reservoirs? (3) What are the time scales upon which lithospheric recycling occurs? (4) In what proportions are the above materials present in plumes? (5) Can the existence of a common component in all plumes be verified?