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

超大型花岗质岩浆体是岩浆弧和收敛大陆边缘发育的共同特征，但尽管对中上层花岗质岩浆的上升、聚集和侵位机制进行了大量研究，但仍存在争议。该项目将测试一种可能的解决方案，包括加利福尼亚内华达山脉典型的早白垩世至晚白垩世细长的大体积岩体是否代表脉状岩浆房，而不是底喷井。研究工作包括建立岩体内岩浆流动的几何和运动学，模拟岩浆的聚集和侵位，同时从流动动力学和观察到的围岩结构出发，约束岩浆上升机制，主要工具是磁导率各向异性（AMS）、岩浆组构的图像分析和野外观测。研究结果有望提供足够的文件来帮助解决岩浆室问题，并帮助建立一个更准确地处理岩浆活动的内华达山脉构造模型。

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.