RUI: How is the Granite Melt Flow Network Recorded in Migmatites and by Associated Granite Plutons?

由于熔体输送影响了造山过程中地壳的热行为和流变行为，因此了解熔体从源到汇的输送机制变得非常重要。这一记录体现在与混合岩有关的花岗岩的几何学、岩相学、地质年代学和地球化学的所有尺度上（基质矿物到岩体尺度）。在混合岩中，小体积花岗岩的几何形状可能记录了熔体迁移的准稳定网络，部分受熔体生产过程中的变形控制。尽管由于导管的周期性关闭和打开，这些体的几何形状可能是全流网络的片段，但一些脉状体可能在变形期间作为整体行进。花岗岩的存在下，在结构控制的网站表明在变形过程中熔体流动，实验数据支持。这项工作的重点是对造山花岗岩熔体流动问题进行完整的跨学科研究。混合岩构造的三维记录几何形状（例如，浅色体和体积较小的花岗岩体）和相关的岩体是必不可少的信息，因为这些数据相当于某种管道，混合岩组构/结构是管道。尽管这种几何形状可能是零碎的或复合的，但理解的基础只能来自这种详细的分析。随后的地质年代学和地球化学数据被放置在一个坚实的，有意义的框架。工作重点是在缅因州西部沿沿着一系列样带的单个大暴露、小组密集露头和新罕布什尔州继续进行。 这项研究的成果是更好地了解熔体通过地壳在造山带，以及使用的结果，以更好地限制区域构造的能力。我们通过对关键暴露的详细（劳动密集型）中尺度和微尺度观测之间的联系来接近这一结果。这项研究基本上包括几个小规模的实地和实验室研究，这些研究由许多工作人员在给定区域内同时进行。因此，研究的每一部分都是一个针对单一目标的更大规模的项目。因此，这项工作非常适合本科生项目，这些项目必须在单学期到单年的时间范围内进行。 这项研究的一个重要影响是来自两个PI机构的本科生团队的参与。研究经验采取为期一年的荣誉论文和一个学期的独立研究的形式，重点与整个项目的不同部分。在一个更大的项目团队参与的重点，让学生获得被投资在一个高层次的科学显著一块的好处。这允许团队合作，同时进行独立的工作，并看到单个项目是如何在更大的努力的重要组成部分。一些学生将通过访问其他设施来获得额外的经验，以便执行一些实验室工作。合作的性质支持交流思想和相互学习。

Because melt transfer affects the thermal and rheological behavior of the crust during orogenesis, it has become important to understand the mechanism by which melt is transferred from source to sink. This record is in the geometry, petrography, geochronology and geochemistry of granites associated with migmatites at all scales (matrix-mineral to pluton scales). Within migmatites the geometry of smaller-volume granites may have recorded a quasi-steady network of melt migration, partly controlled by deformation during melt production. Although the geometry of these bodies may be fragments of the full-flow network due to periodic closing and opening of conduits, some vein-like bodies may travel as a whole during deformation. The presence of granite in structurally controlled sites suggests melt flow during deformation, as is supported by experimental data. This work is focused upon a complete interdisciplinary approach to the question of orogenic granite melt flow. The 3-D documentation the geometry of migmatitic structures (e.g., leucosomes and smaller-volume granite bodies) and associated plutons is essential information as these data amount to some sort of plumbing, with migmatitic fabrics/structures as the conduits. Despite the possibility that this geometry may be fragmentary or composite, the base of understanding can come only from this detailed analysis. Subsequent geochronological and geochemical data is placed in a solid, meaningful framework. Work is focused on single large exposures, small sets of closely-spaced outcrops and along a series of transects in western Maine, and continues into in New Hampshire. The outcome of the research is the better understanding of melt-transit through the crust in orogens, as well as the capacity to use the results to better constrain regional tectonics. We approach this outcome through connection between detailed (labor-intensive) mesoscale and microscale observation of key exposures. The study fundamentally incorporates several small-scale field and laboratory studies that are performed by many workers, operating simultaneously within a given region. Each part of the study, therefore, sums to a larger-scale project aimed at a singular goal. Therefore, the work is perfectly suited for undergraduate student projects that necessarily operate on single-semester to single-year time scales. An important impact of this study is the involvement of a team of undergraduate students from both PIs' institutions. Research experiences take the form of year-long Honors Theses and one-semester Independent Studies with foci related to distinct parts of the overall project. The focus on team participation in a larger project allows students to reap the benefit of being invested in a significant piece of high-level science. This allows for teamwork while conducting independent work, and seeing how individual projects are important components in the larger effort. Some students will gain additional experience by visiting other facilities in order to perform some of the lab work. The collaborative nature supports exchanging ideas and learning from one another.