A COLLABORATIVE, STRATIGRAPHICALLY CONTROLLED GEOCHEMICAL AND ISOTOPIC STUDY OF SOUTH ATLANTIC OCEAN ISLAND VOLCANISM

该项目是对火山作用的综合地球化学研究， 南大西洋中的圣赫勒拿岛。 的 这个岛上的火山岩是化学上 洋岛玄武岩（OIB）中独特的端员，它 计划全面表征微量元素和同位素 这些玄武岩的地球化学通过分析地层 对照样品。 Sr、Nd、Pb同位素比值 分析，结合主要和微量元素测定， 将用于量化混合关系，并最终 确定这些玄武岩的地幔来源。 这应该有助于 确定负责的端元罩组件 OIB的化学异质性。 主元素和微量元素 地球化学将进行韦弗在大学 俄克拉荷马州，放射性同位素地球化学是辛德勒在拉蒙- 多尔蒂地质观测站和稳定同位素地球化学 哈蒙在英国NERC同位素地质中心。

This project is a comprehensive geochemical study of volcanism on the island of Saint Helena in the South Atlantic Ocean. The volcanic rocks of this island are representative of a chemically distinctive end-member among ocean island basalts (OIB), and it is planned to fully characterize the trace element and isotope geochemistry of these basalts by analysis of stratigraphically controlled samples. Ratios among Sr, Nd, and Pb isotope analyses, combined with major and trace element determinations, will be used to quantify mixing relationships and ultimately to identify mantle sources for these basalts. This should help identify the end-member mantle components which are responsible for the chemical heterogeneity of OIB. Major and trace element geochemistry will be carried out be Weaver at the University of Oklahoma, radiogenic isotope geochemistry be Zindler at Lamont- Doherty Geological Observatory, and stable isotope geochemistry by Harmon at the NERC Isotope Geology Centre in the UK.