Collaborative Research: Evaluating the Competing Roles of Garnet and Fluid in Controlling U-Th Disequillibria in Lavas of the Aleutian Island Arc

合作研究：评估石榴石和流体在控制阿留申岛弧熔岩中 U-Th 不平衡中的竞争作用

• 批准号: 0509922
• 负责人: Gene Yogodzinski
• 金额: --
• 依托单位: University South Carolina Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-01-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0509922&HistoricalAwards=false
• 关键词: Collaborative; Research; Evaluating; Competing; Roles

The main objective of this project is to understand the competing roles of residual garnet and fluid in controlling the state of U-series disequilibria in primitive magnesian andesite magmas produced in different parts of the Aleutian island arc. The research target for this study includes the following Aleutian volcanoes: Korovin, Little Sitkin and Piip. Lavas from each of these volcanoes have evolved along distinctive geochemical trends at different locations along the arc where orthogonal subduction rates and the inferred thermal state of the subduction system are different. In this context Piip Volcano is of particular interest because it is a relatively well-known magnesian andesite occurrence in the far western Aleutian Komandorsky area. The main analytical effort will be the measurement of 234U/238U, 230Th/232Th and 238U, 232Th and 226Ra concentrations. In addition, whole rock major and trace element data and Pb, Sr, Nd and Hf isotopic compositions will be collected for all samples where such data do not already exist. Some sample preparation, including column chemistry for Pb, Sr, Nd and Hf, will be done at the University of South Carolina, but all U-series chemistry and all isotopic measurements (except Hf) will be made in the laboratories at the Woods Hole Oceanographic Institution. This project will serve as the primary basis for the PhD degree of University of South Carolina graduate student Chris Wyatt, who will work under the direction of both PI's. The project also funds undergraduate participation, which will include undergraduate research for academically strong and well-motivated students.

该项目的主要目的是了解残留石榴石和流体在控制U系列状态在原始木nesian安山岩岩浆中，在阿留申岛弧的不同部分产生的竞争性作用。这项研究的研究目标包括以下阿留申火山：科罗文，小西金和piip。 这些火山中的每一个的熔岩沿着弧线的不同位置的独特地球化学趋势进化，沿弧线正交俯冲速率和俯冲系统的推断热状态不同。在这种情况下，PIIP火山特别令人感兴趣，因为它是一个相对众所周知的镁元安宁山脉，在遥远的阿留申科曼多斯基地区发生。 主要的分析工作将是测量234U/238U，230/232和238U，232TH和226RA浓度。 此外，将为所有尚不存在此类数据的样品收集整个岩石专业和跟踪元素数据以及PB，SR，ND和HF同位素组成。 一些样品制备将在南卡罗来纳大学进行，包括PB，SR，ND和HF的柱化学，但是所有U系列化学和所有同位素测量（HF除外）将在伍兹孔海洋学机构的实验室中进行。 该项目将成为南卡罗来纳大学研究生克里斯·怀亚特（Chris Wyatt）博士学位的主要基础，后者将在PI的指导下工作。该项目还资助了本科参与，其中包括针对学术上强大且动机良好的学生的本科研究。