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

了解地球物质在一系列时间和空间尺度上的流变性是构造学的首要问题。地壳流变学通常在活动造山系统的应变软化和流体流动过程中演化，但应变速率、水解软化、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把详细的激光探头(从变形碎屑、应变阴影和矿脉中的多种微结构环境中挖掘出来的约400种分析)和阶梯加热40Ar/39Ar地质年代学分析与正在进行的微观结构和微观地球化学研究相结合，提供一种新的多学科方法来量化流体-岩石相互作用的应变率和时间关系。参与该项目所有阶段的学生将接触到领先的、可能是变革性的研究。

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.