Elongate Plutons in a Large-Volume Magmatic Arc, Central Sierra Nevada, California: Do they Represent Dike-Fed Chambers?

9404697托比施超大型花岗岩体是岩浆弧和大陆边缘汇聚的共同特征，然而，尽管有大量的研究，但关于中上部地壳内花岗岩浆上升、聚集和侵位的机制仍存在争议。该项目将测试一种可能的解决方案，涉及加州内华达山脉典型的细长、大体积的早白垩世-晚白垩世深成岩浆是否代表岩浆岩浆室，而不是底辟。这项工作将包括建立岩体中岩浆流动的几何学和运动学，并建立聚集和侵位的模型，同时从流动动力学和观察到的围岩结构来约束上升机制，主要工具将是磁化率各向异性(AMS)、岩浆组构图像分析和野外观测。预计结果将提供足够的文件来帮助解决岩浆室问题，并帮助开发内华达山脉的构造模型，以更准确地处理岩浆活动。

9404697 Tobisch Very large granitic bodies are a common feature in the development of magmatic arcs and convergent continental margins, however despite considerable study the mechanisms of ascent, assembly and emplacement of granitic magma within mid-to-upper crustal levels are still controversial. This project will test a possible solution involving whether elongate, large-volume Early- Late Cretaceous plutons typical of the Sierra Nevada, California, represent dike-fed magma chambers rather than diapirs. the work will involve establishing the geometry and kinematics of magma flow in the pluton and model the assembly and emplacement, while constraining the ascent mechanism from the flow dynamic and observed wall rock structures the main tools will be anisotropy of magnetic susceptibility (AMS) image analysis of magmatic fabrics and field observation. Results are expected to provide sufficient documentation to help resolve the magma room problem and help develop a tectonic model of the Sierra Nevada that more accurately treats the magmatic activity.