EAGER: Detailed 40Ar/39Ar geochronology of deformed diamictite to quantify strain rates and timing relations of fluid-rock interaction

了解地球物质在时间和空间尺度上的流变性是构造学中的一级问题。在活动造山带中，地壳流变学通常在应变软化和流体流动过程中发展，但应变速率、水解弱化、反应软化和流体通量之间的关系尚不完全清楚。犹他州的这项工作将整合详细的激光探测（来自变形碎屑、应变阴影和脉状等多种微观结构设置的100微米尺度挖掘的约400次分析）和逐步加热的40Ar/39Ar地质年表分析，以及正在进行的微观结构和微地球化学研究，提供一种新的多学科方法来量化应变率和流体-岩石相互作用的时间关系。参与项目各个阶段的学生将接触到领先的和可能具有变革性的研究。

Understanding the rheology of earth materials over a range of temporal andspatial scales is a first-order issue in tectonics. Crustal rheology commonly evolves during strain softening and fluid flow in active orogenic systems, but relations between strain rates, hydrolytic weakening, reaction softening, and fluid flux are incompletely understood. This work in Utah will integrate detailed laser-probe ( about 400 analyses from 100-micron-scale excavations from multiple microstructural settings in deformed clasts, strain shadows, and veins) and step-heating 40Ar/39Ar geochronologic analyses with ongoing microstructural and microgeochemical studies, providing a novel multidisciplinary approach to quantify strain rates and timing relations of fluid-rock interaction. Students involved at all stages of the project will be exposed to leading and possibly transformative research.