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

[406576] Seaman：这份职业发展计划的提案代表了PI的研究方向，即将同位素和稀土元素分析应用于涉及岩浆起源的问题。在过去，她一直专注于研究岩体和火山地体内部岩浆之间的相互作用，并利用结构关系来评估岩浆的混合和混合作为产生成分多样性的过程。同位素数据的使用将使她能够专注于更大规模、更多的构造问题，即伸展和挤压环境下熔体形成机制以及产生岩浆房的物理手段。她打算利用同位素和稀土元素分析来模拟火成岩系统，并通过岩浆成因研究未来的构造问题。拟对阿卡迪亚岩浆活动的时间和缅因州沿海火山带双峰火山岩的成因进行研究。这些岩石为年龄测定、来源确定和稀土元素分析提供了理想的研究问题。本研究将利用锆石U-Pb定年对缅因州沿海火山省的四个火山序列进行定年，并利用Nd和Pb同位素分析和ICP-MS分析来补充现有的野外工作，并利用主要元素和微量元素分析来限制这些序列中岩浆成因所涉及的物质的来源。

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.