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

构造和岩石学对弧岩浆过程和岩浆演化的控制：阿拉斯加塞瓜姆岛阿留申岛弧

• 批准号: 8917354
• 负责人: James Myers
• 金额: $ 3.23万
• 依托单位: University of Wyoming
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-07-01 至 1992-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8917354&HistoricalAwards=false
• 关键词: Tectonic; Petrologic; Controls; Arc; Magmatic

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.

本项目的目的是将分析工作集中于 塞瓜姆岛的中央和现代火山，使用的样本， 是在以前的一个项目中收集的， 古老的南方火山 私家侦探们会表演主要的， 微量元素和稀土元素分析，微探针和Nomarski表征 Sr、Nd和Pb同位素分析。 该项目的目标是了解控制， 构造过程，如Amlia的伸展和俯冲 断裂带对岩浆作用和源区的影响 弧熔岩。 岩浆的时间演化 在各个岛弧中心记录过程。 通过 将这项对Seguam的研究扩展到全新世，他们将有一个 岩石学记录跨越了整个火山活动时期 然后他们可以根据变化来评估活动， 地质构造环境