Pluton Roofs: Testing Pluton Emplacement Hypotheses

在大量岩浆的就位过程中，乡村岩石物质被转移出上升/膨胀的岩浆体的路径，但这究竟是如何完成的是一个长期存在的问题。这个项目将通过研究一些可供研究的岩体顶部（与更普遍保存的墙壁相反）的例子来解决这个问题，希望它们能为在岩体墙壁中不明显的空间容纳机制保存证据。这项工作将涉及详细的绘图、应变分析、织物研究和其他微观结构技术，以限制与就位有关的变形的三维结构重建。内华达州的耶林顿岩基，蒙大拿州的鲍威尔山岩基和其他例子将被研究。研究结果将揭示物质在侵位过程中是如何转移的，并有助于完善岩体侵位与岩浆房演化之间的关系。

During emplacement of large masses of magma, country rock material is transferred out of the path of the ascending/inflating magma body, but precisely how this is accomplished is a long-standing problem. This project will approach the question by examining selected examples in which pluton roofs (as opposed to the more commonly preserved walls) are available for study, in the hopes they preserve evidence for the space-accommodating mechanism that is not evident in pluton walls. The work will involve detailed mapping, strain analysis, fabric study and other microstructural techniques to constrain three-dimensional structural reconstructions of emplacement-related deformation. The Yerington batholith, Nevada, the Mount Powell batholith, Montana and other examples will be studied. Results will address how material was transferred during emplacement and will help refine the relationship between emplacement of plutons and magma chamber evolution.