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CAA: Isotopic Investigation of the Ages and Origins of Volcanic Successions of the Coastal Maine Volcanic Belt

CAA：缅因州沿海火山带火山演替的年龄和起源的同位素研究

基本信息

批准号：
9406576
负责人：
Sheila Seaman
金额：
$ 4万
依托单位：
University of Massachusetts Amherst
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1994
资助国家：
美国
起止时间：
1994-07-15 至 1996-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9406576&HistoricalAwards=false
关键词：
CAA Isotopic Investigation Ages Origins

项目摘要

9406576 Seaman This proposal to the Career Advancement Program represents a redirection in the PI's research toward the application of isotopic and rare earth element analyses to problems involving the origin of magmas. In the past she has focused on interaction between magmas within plutons and volcanic terranes, and has used textural relationships to evaluate mixing an mingling of magmas as processes to produce compositional diversity. The use of isotopic data will allow her to focus on larger scale, more tectonic problems of mechanisms of melt genesis in extensional and compressional settings and the physical means of producing a magma chamber. She intends to use isotopic and rare earth element analyses for modelling igneous systems and studying tectonic problems through magma genesis well into the future. The proposed research is on the timing of Acadian magmatism and on the origin of bimodal volcanic rocks of the coastal volcanic belt of Maine. These rocks provide an ideal research problem for age and source material determination, and for rare earth element analysis. This work will use U-Pb dating of zircons to date four volcanic successions of the coastal Maine volcanic province and use Nd and Pb isotopic analyses and ICP-MS analyses to complement existing field work, and major and trace element analyses to constrain the origin of the materials involved in the genesis of the magmas represented in these successions.

9406576 海员这份职业发展计划的提案代表着私家侦探的研究方向同位素和稀土元素的应用对岩浆成因问题的分析。在过去，她一直专注于与岩浆内的深圳湾和火山岩，使用纹理关系来评估混合和岩浆混合的过程成分多样性同位素数据的使用将使她能够专注于更大规模的，更有构造性的拉张作用中的熔体成因机制问题和挤压环境，形成岩浆房她打算用同位素和稀土元素分析，通过岩浆研究构造问题创世纪的未来拟议的研究是关于马格德堡岩浆活动的时间和双峰式火山岩缅因州。这些岩石提供了一个理想的研究问题用于年龄和源材料测定，以及用于稀有土元素分析这项工作将使用U-Pb测年法四次火山喷发的年代沿海缅因州火山区，并使用Nd和Pb 同位素分析和ICP-MS分析，现有的野外工作，以及主要和微量元素限制材料来源的分析参与了岩浆的形成，这些继承。