Tectonic and Petrologic Controls on Arc Magmatic Processes and Magma Evolution: Seguam Island Aleutian Arc, Alaska

这个项目的目的是集中分析西古安岛的中央和现代火山，使用在以前的一个项目中收集的样本，该项目集中研究较老的南部火山。pi将进行主要、次要和稀土元素分析，熔岩的微探针和Nomarski表征，以及Sr、Nd和Pb同位素分析。该项目的目的是了解构造过程，如Amlia断裂带的伸展和俯冲，对岩浆过程和弧熔岩来源的控制作用。在个别岛弧中心，岩浆过程的时间演化很少有记录。通过将Seguam的研究扩展到全新世，他们将有一个跨越整个火山活动时期的岩石学记录，然后他们可以根据不断变化的构造环境来评估。

The purpose of this project is to focus analytical work on the Central and Modern Volcanics of Seguam Island, using samples that were collected during a previous project which concentrated on the older Southern Volcanics. The PIs will be performing major, minor and REE analyses, microprobe and Nomarski characterization of the lavas, and Sr, Nd, and Pb isotopic analyses. The goal of the project is to understand the control which tectonic processes, such as extension and subduction of the Amlia fracture zone, exert upon the magmatic processes and the sources of arc lavas. Only rarely has the temporal evolution of magmatic processes been documented at individual island arc centers. By extending this study of Seguam to the Holocene, they will have a petrologic record that spans the entire period of volcanic activity which they can then evaluate in terms of changing tectonic environments over time.