Geochemical Studies of Ocean Basin Evolution

在EPR（9030′n, 13p30′-15oN）、MAR（36oN）、Gorda Ridge、Jackson总统海山、南大西洋热点径迹等地区开展了重要的同位素和微量元素地球化学研究。他现在希望继续这项工作，并分析来自太平洋和大西洋的玄武岩中的微量元素丰度，目的是表征两个脊系统的来源组成和岩浆过程，这两个脊系统的扩展速度非常不同。此外，他还将分析来自EPR地区的零年龄和更老的玄武岩，以评估导致EPR地区岩浆演化中时间地球化学变化的过程。本项目的一个重要重点是确定EPR、FAMOUS和一些海洋岛屿地区海洋玄武岩的U、Th和Pb丰度。目的是表征地幔柱与枯竭N-MORB储层的U/Pb和Th/U比值。该项目的最终目标是量化地幔源（地幔柱、枯竭储层）的地球化学模型以及影响大洋中脊地壳形成的过程。

The P.I. has carried out significant research on isotope and trace element geochemistry of EPR (9o30'N, 13p30'-15oN), MAR(36oN), the Gorda Ridge, President Jackson Seamounts, & S. Atlantic hot spot tracks. He now wishes to continue this effort and analyze trace element abundances in basalts from both Pacific and Atlantic oceans with the objective of characterizing source compositions and magmatic processes in the two ridge systems that have very different spreading rates. Additionally, he will analyze zero age and somewhat older basalts from the EPR area in order to evaluate the processes which cause temporal geochemical variations in magma evolution along the EPR. An important thrust of the present project is the determination of the U, Th and Pb abundances of oceanic basalts from EPR, FAMOUS, and some ocean island areas. The purpose is to characterize U/Pb and Th/U ratios of mantle plumes vs. the depleted N-MORB reservoir. The ultimate goal of this project is to quantify geochemical models of mantle sources (plumes, depleted reservoirs) and the processes which affect crust formation at mid-oceanic ridges.