Contact Aureole Rheology

0106557 Yoshinobu过程的速率控制着各种各样的地质现象。 随着更精确和更精细的放射性测年技术的发展，越来越明显的是，岩浆弧中的过程，如岩浆生成和上升，可能会以相对较快的速度发生，并持续很长时间。 与此相反，现有的区域变形数据集表明，各种过程，如断层，剪切和褶皱的速度比岩浆生成，迁移和侵位的速度慢几个数量级。这项研究是利用现场，微观结构，和实验岩石变形数据集，以解决以下问题：（1）什么样的微观和宏观尺度变形机制，适应变形接触晕？(2)在与硐室施工有关的塑性变形过程中，围岩中的应力大小是多少？(3)在与硐室施工相关的塑性变形过程中，围岩的应变率是多少？（4）接触带的“典型”粘度是什么？目前正在对加州东部克拉克山脉暴露的两个岩体-寄主岩石系统进行详细测绘和显微结构分析，并将实验得出的流动定律和古压力计（古应力计）应用于变形接触晕岩石，以评价这些问题，并提供接触晕应力、应变率和粘度的限制。

0106557 YoshinobuRates of processes control a wide variety of geologic phenomena. With the development of more precise and refined radiometric age dating techniques, it is becoming increasingly apparent that processes in magmatic arcs such as magma generation and ascent may occur at relatively fast rates and over a wide range of durations. In contrast, existing data sets for regional deformation suggest that rates of various processes such as faulting, shearing, and folding are several orders of magnitude slower than rates of magma generation, migration, and emplacement. This research is utilizing field, microstructural, and experimental rock deformation data sets to address the following questions: (1) What micro- and macro-scale deformation mechanisms accommodate deformation in contact aureoles? (2) What are the magnitudes of stress in the host rocks during plastic deformation associated with chamber construction? (3) What are the host rock strain rates during plastic deformation associated with chamber construction? And (4) What are "typical" viscosities in contact aureoles? Detailed mapping and microstructural analysis conducted on two pluton-host rock systems, exposed in the Clark Mountains of eastern California, as well as application of experimentally-derived flow laws and paleo-piezometers (paleo-stress gauges) to deformed contact aureole rocks are currently being carried out to evaluate these questions and provide constraints on contact aureole stresses, strain rates and viscosities.