Hafnium Isotope Constraints on the Source Characteristics of Normal Mid-ocean Ridge Basalts

铪同位素对正常洋中脊玄武岩来源特征的约束

• 批准号: 0648484
• 负责人: Vincent Salters
• 金额: $ 28.9万
• 依托单位: Florida State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-04-01 至 2012-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0648484&HistoricalAwards=false
• 关键词: Hafnium; Isotope; Constraints; Source; Characteristics

Intellectual Merit: This research seeks to obtain high-spatial resolution, high-precision isotopic data to address fundamental questions on the generation of mid-ocean ridge basalts. Two competing hypotheses for the generation of ocean crust will be tested on the basis that the two models predict different distributions of low-degree melts along the ridge. Because basalt chemistry is strongly dependent on the degree of melting this project looks at trace elements and key indicator isotopes such as Hafnium, Neodymium, Lead, and Strontium to determine which model is correct. The case study from which samples have already been obtained is the East Pacific Rise between 6oN and 19oN. Results will be compared to data from the Mid-Atlantic Ridge. Chemical analyses will be made using the new ICPMS that was recently installed at Florida State University. Broader Impacts: This project will support a graduate student and undergraduates. It also provides core support for a multi-user laser ICPMS facility which has a focus on training students. High school teachers will also be exposed to this research through an ongoing summer program to expose them and their students to scientific discovery.

智力价值：本研究旨在获得高空间分辨率、高精度同位素数据，以解决有关洋中脊玄武岩生成的基本问题。 将测试关于洋壳生成的两个相互竞争的假设，这两个模型预测了沿着洋脊的低度融化的不同分布。 由于玄武岩化学很大程度上取决于熔化程度，因此该项目着眼于微量元素和关键指示同位素（例如铪、钕、铅和锶），以确定哪个模型是正确的。 已获取样本的案例研究是北纬 6 度至 19 度之间的东太平洋海隆。结果将与大西洋中脊的数据进行比较。 将使用佛罗里达州立大学最近安装的新型 ICPMS 进行化学分析。 更广泛的影响：该项目将为研究生和本科生提供支持。 它还为专注于培训学生的多用户激光 ICPMS 设施提供核心支持。 高中教师也将通过正在进行的暑期项目接触到这项研究，让他们和他们的学生接触到科学发现。