Stratigraphically Controlled Geochemical Studies of South Atlantic Ocean Island Volcanism: Ascension Island

这个项目将检查微量元素和同位素 （放射成因和稳定）地层特征- 控制了Ascension的火山活动， 不相容的微量元素和同位素比率的变化， 为了确定海洋岛屿之间的 玄武岩（OIB）的物源成分，以及OIB的成因。 的 Ascension上大量的火山碎屑岩还没有被描述; PI将对火山学进行详细研究， 火山碎屑岩的岩石学和地球化学特征 熔岩流和整个岛屿的岩浆演化。 作为 Ascension微量元素和同位素特征 火山岩似乎是典型的大多数OIB，它是 重要的是要充分评估岩石成因和起源的OIB 类型.

This project will examine the trace element and isotopic (radiogenic and stable) characteristics of stratigraphically- controlled Ascension Island volcanics to establish the magnitude of variations in incompatible trace-element and isotopic ratios, in order to determine mixing relationships between ocean island basalt (OIB) source components, and the origin of OIB. The voluminous pyroclastics on Ascension are as yet uncharacterized; the PIs will undertake a detailed study of the volcanology, petrology and geochemistry of the pyroclastics in relation to the lava flows and the overall magmatic evolution of the island. As the trace element and isotopic characteristics of Ascension volcanics appear to be typical of the majority of OIB, it is important to fully assess the petrogenesis and origin of this OIB type.