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

EAGER：变形混积岩的详细 40Ar/39Ar 地质年代学，用于量化流体-岩石相互作用的应变率和时间关系

• 批准号: 1048393
• 负责人: W.A. Yonkee
• 金额: $ 1.89万
• 依托单位: Weber State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-08-01 至 2014-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1048393&HistoricalAwards=false
• 关键词: EAGER; Detailed; 40Ar; 39Ar; geochronology

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.

了解地球材料在一定时间和空间尺度上的流变性是构造学中的首要问题。地壳流变学通常在活跃造山系统的应变软化和流体流动过程中演变，但应变率、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针（对变形碎屑、应变阴影和矿脉的多种微观结构环境中的 100 微米级挖掘进行的约 400 次分析）和逐步加热 40Ar/39Ar 地质年代学分析以及正在进行的微观结构和微观地球化学研究，提供了一种新颖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。参与该项目各个阶段的学生将接触到领先的、可能具有变革性的研究。