Postdoctoral Fellowship: EAR-PF: Petrochronometers as provenance proxies: implications for the spatio-temporal evolution of continental collision to escape

博士后奖学金：EAR-PF：石油测时计作为起源代理：对大陆碰撞逃逸的时空演化的影响

• 批准号: 2305217
• 负责人: Megan Mueller
• 金额: $ 18万
• 依托单位: Mueller, Megan A
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-05-01 至 2026-04-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2305217&HistoricalAwards=false
• 关键词: Postdoctoral; Fellowship; EAR; PF; Petrochronometers

Dr. Megan Mueller has been awarded an NSF EAR Postdoctoral Fellowship to conduct research and educational activities at the University of Arizona alongside mentor Dr. Mauricio Ibañez-Mejia. Sedimentary provenance analysis is widely used across the Earth sciences to reconstruct ancient sediment dispersal networks, source-to-sink sediment budgets, sedimentary basin evolution, and to discern links between tectonics, paleogeography, climate, and biology. However, provenance methods that exclusively focus on studying the age distributions and chemistry of the mineral zircon (ZrSiO4) in sedimentary environments are limited in tracking detritus sourced from mafic and metamorphic rocks. This limitation is especially pronounced in continental collision settings, where obducted fragments of oceanic crust and exhumed metamorphic massifs are common sources of sediment but whose cryptic provenance signatures impose limits on the ability to perform accurate geodynamic and paleogeographic reconstructions. This research investigates the applicability of combined traditional and non-traditional sedimentary provenance methods to reconstruct sedimentary provenance during the transition from continental collision to tectonic escape in the Ulukisla Basin in south-central Turkiye. This study develops workflows for novel, emerging sedimentary provenance techniques that can be applied to tectonic settings worldwide and aid in addressing outstanding questions in the Earth sciences. The project supports field- and laboratory-based training and research experience for undergraduate students in the United States and Turkiye.Accurately reconstructing the timing and dynamics of continental collisions in modern and deep-time settings remains a key challenge for the tectonics community. However, a growing body of work suggests that sedimentary basins may hold the most complete record of subduction, accretion, collision, and escape. Utilizing the deformational, magmatic, and metamorphic information preserved in detrital minerals thereby provides a way to unite proxy records into a holistic model of collisional evolution. This project leverages the U-Pb, Hf, Nd, and trace element composition of detrital zircon, rutile, and titanite, to track sedimentary provenance from igneous and metamorphic sources. This study will create a proof-of-concept workflow for detrital petrochronology applied to sedimentary basin analysis. Furthermore, these datasets establish quantitative relationships between the timing, tempo, and spatial extent of magmatism, metamorphism, deformation, crustal thickness, and exhumation. Using this multi-proxy approach, this project aims to document the spatial and temporal evolution of continental collision and tectonic escape. The results will inform future work in sedimentary provenance analysis and continental collision settings from modern and ancient orogens.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

Megan Mueller 博士获得了 NSF EAR 博士后奖学金，与导师 Mauricio Ibañez-Mejia 博士一起在亚利桑那大学开展研究和教育活动。沉积物来源分析广泛应用于地球科学领域，以重建古代沉积物扩散网络。 -下沉沉积物预算、沉积盆地演化，并辨别构造、古地理、气候和生物学之间的联系。然而，起源方法只专注于研究年龄分布。沉积环境中矿物锆石 (ZrSiO4) 的化学成分在追踪源自镁铁质和变质岩的碎屑方面受到限制，这种限制在大陆碰撞环境中尤其明显，其中洋壳的仰冲碎片和挖出的变质岩块是沉积物的常见来源，但其神秘的起源特征限制了进行准确的地球动力学和古地理重建的能力。本研究调查了传统和非传统相结合的适用性。沉积物源方法，用于重建土耳其中南部乌卢基斯拉盆地从大陆碰撞到构造逃逸过渡期间的沉积物源。这项研究开发了新颖的、新兴的沉积物源技术的工作流程，该技术可应用于全球范围内的构造环境，并有助于解决突出的问题。该项目支持美国和土耳其本科生的实地和实验室培训和研究经验，准确重建大陆碰撞的时间和动力学。然而，越来越多的研究表明，沉积盆地可能拥有最完整的俯冲、增生、碰撞和逃逸记录。因此，碎屑矿物中保存的变质信息提供了一种将代理记录整合到碰撞演化整体模型中的方法，该项目利用了碎屑的 U-Pb、Hf、Nd 和微量元素组成。锆石、金红石和钛矿，以追踪火成岩和变质岩来源的沉积物来源。这项研究将为应用于沉积盆地分析的碎屑岩石年代学创建概念验证工作流程。该项目旨在利用这种多代理方法记录岩浆作用、变质作用、变形、地壳厚度和折返的空间范围。研究结果将为反映现代和古代造山带的沉积物源分析和大陆碰撞环境的未来工作提供信息。该奖项是 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。 。