Isotopic and Trace Element Studies of the Lithospheric Mantle, Petrogenetic Processes and Magma Transport, & the Early Stages of Continental Crust Formation

这是一个建议，继续扩大我们的同位素和跟踪 各种地幔和幔源岩的元素研究 作为岩石圈组成和演化的示踪剂 和上地幔，以及岩石形成过程，如熔融 和岩浆运输。 我们的工作以同位素为中心 一方面是Sr、Nd、Pb研究，另一方面是U、Th系列研究 另一个是同位素， 与同位素一起测量的浓度 比率测定。 此外，我们还讨论了增加一个 一些重要的大离子半径和高场强 我们的调查结果显示，我们的产品和服务质量得到了极大的提升。 它们各不相同，既有区域性的目标，也有更普遍的目标。 在 从最普遍的意义上说，所提出的工作旨在进一步 我们对岩石圈组成和演化的认识 大陆和海洋环境中的上地幔， 以帮助理解诸如岩浆运输的时间等因素 以及岩浆作用过程中的化学分馏机制。 使用同位素作为示踪剂，我们还将尝试跟踪 陆壳形成的最早阶段， 岛弧 我们将调查的具体材料 追求这些目标包括熔岩从锡耶特和德干 印度的圈闭;英西亚碱性玄武岩中的地幔捕虏体， 中国、北美洲西部和南部的海洋岛屿 太平洋;吕宋岛的一个深成岩序列 菲律宾;来自阿留申群岛的岛弧熔岩，山脊玄武岩 来自太平洋和马里亚纳海槽弧后盆地。

This a proposal to continue and expad our isotopic and trace element studies of a variety of mantle and mantle-derived rocks as tracers of the composition and evolution of the lithosphere and upper mantle, and of petrogenetic processes such as melting and magma transport. Our work is centered around isotopic studies of Sr, Nd and Pb on the one hand and U, Th series isotopes on the other, and the associated trace element concentrations which are measured in concert with the isotope ratio determinations. In addition, we discuss plans to add a number of important large ionic radius and high field strength elements to our capabilities using ICP-MS. Our investigations are varied and have both regional and more uniersal goals. In the most general sense, the work proposed is inteded to further our knowledge of the composition and evolution of the lithosphere anduppermost mantle in both continental and oceanic settings, and to help nderstand factors such as the timing of magma transport and the mechanisms of chemical fractionation during magmagenesis. Using isotopes as tracers we will also attempt to follow the earliest stages of continental crust formation in an accreting island arc terrane. Specific material we will investigate in pursuit of these goals incluse lavas from the Sylhet and Deccan Traps of India; mantle xenoliths from alkali basalts in Incia, China, Western North America and oceanic islands in the South Pacifice; a sequence of plutonic rocks from Luzon in the Philippines; island arc lavas from the Aleutians, ridge basalts from the Pacific and the Mariana Trough back arc basin.