EAR-PF: Tracking rocks from depth to the surface: Coupled (U-Th)/(Pb-He) dating of monazite

EAR-PF：从深处到地表追踪岩石：独居石耦合 (U-Th)/(Pb-He) 测年

• 批准号: 0948158
• 负责人: Emily Peterman
• 金额: $ 17万
• 依托单位: Peterman Emily M
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-05-01 至 2013-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0948158&HistoricalAwards=false
• 关键词: EAR; PF; Tracking; rocks; depth; EAR; PF; Tracking; rocks; depth

Dr. Emily M. Peterman has been granted the NSF Earth Sciences Postdoctoral Fellowship to carry out a research and education plan at Stanford University. This research will develop and calibrate a new technique to determine particle paths within the crust from a single key mineral that is present in many rocks. Monazite is a uranium- and thorium-bearing phosphate that can be analyzed by multiple methods to provide isotopic age information that bear upon both the timing of high-temperature crystallization and subsequent lower-temperature cooling during crustal residence. Furthermore, the trace element and isotopic composition of monazite can be linked to growth conditions within the crust. By combining all of this information, the newly developed approach will improve our ability to quantitatively reconstruct the spatial and temporal nature of crust-forming processes.This comprehensive analysis of the use of monazite as a chronometer for elucidating the formation and evolution of continental crust will impact a broad range of geoscience disciplines, including tectonics, geomorphology, metamorphic petrology, landscape evolution and continental dynamics. By improving the accuracy and precision of monazite isotopic age analysis, this research will improve our ability to constrain geodynamic models of crustal evolution. The details of the new methodology - including the calibration of compositionally dependent effects - may have application to other techniques, and should benefit the geoochronologic community at large. Research methods developed in this project will be integrated into a field-based course to be taught by Peterman in Death Valley. Through this course, undergraduate and graduate students will be taught how to collect samples, analyze data, and publish a paper that constrains the timing of deformation along a major fault that exposes some of the deepest-known exposures of southwestern North American crust. The results from this study will also be incorporated into an outreach demonstration that uses coupled monazite chronometry to provide an animated module that illustrates the mechanics, timing and rates of processes responsible for creating dynamic orogens such as the Himalaya.

Emily M. Peterman博士被授予NSF Earth Sciences博士后研究金，以在斯坦福大学执行研究和教育计划。这项研究将开发并校准一种新技术，以确定许多岩石中存在的单个钥匙矿物的粒子路径。独居石是一种铀和肾磷酸盐，可以通过多种方法来分析，以提供同位素年龄信息，这些信息既有在高温结晶的时机和随后在地壳住宅期间进行下温度冷却的时间。此外，独居石的痕量元素和同位素组成可以与地壳内的生长条件有关。通过结合所有这些信息，新开发的方法将提高我们定量重建地壳形成过程的空间和时间性质的能力。这种对使用单唑的使用作为列出大陆壳的形成和演化的全面分析，将影响大陆cont的范围内的地球范围，包括构造的构造，地球学，陆上范围，地球学，逐渐逐渐逐渐逐渐逐渐逐渐逐渐逐渐逐渐逐渐逐渐逐渐逐渐逐渐逐渐融合。动力学。通过提高独居石同位素年龄分析的准确性和精度，这项研究将提高我们约束地壳演化的地球动力学模型的能力。新方法的细节（包括校准构图依赖效果的校准）可能会适用于其他技术，并且应该使地质教学界受益。该项目中开发的研究方法将集成为基于现场的课程，由彼得曼在死亡谷中教授。通过本课程，将教授本科生和研究生如何收集样本，分析数据并发布一篇论文，该论文限制了沿主要断层的变形时间，以暴露一些北美西南部北美地壳的最深入的暴露。这项研究的结果还将被纳入外展演示中，该演示使用耦合的独居原子能机构等级来提供一个动画模块，以说明负责创建喜马拉雅等动态orogens的机械，时机和过程速率。