The Origin and Evolution of Mantle Plumes

9418398白色这是一个分析程序，将产生一个全面的数据集的一些关键地幔柱。 这一套将包括放射成因同位素比（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以及主要元素。 这项工作将侧重于已经分析了一些元素和同位素的样本;因此，它更多地是在复杂现有的数据集，而不是产生新的数据集。 分析工作将通过收集文献中的现有数据，对其进行质量过滤，并建立一个关于海洋岛屿和岛弧火山岩的广泛的地球化学数据库来补充。 从所得的数据集，将试图回答以下问题：（1）什么是微量元素和稳定同位素特征的3个主要地幔柱类？ (2)在地幔柱油气藏的地球化学演化中，各种物源的相对贡献如何？ (3)岩石圈再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一种共同的成分？

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?