RUI: Collaborative Research: Testing models for the Late Jurassic Nevadan Orogeny: Age, provenance, and structural evolution of the Galice and Mariposa basins, OR and CA

RUI：合作研究：侏罗纪晚期内华达造山运动的测试模型：加利斯盆地和马里波萨盆地（OR 和 CA）的年龄、起源和结构演化

• 批准号: 2052111
• 负责人: Kathleen Surpless
• 金额: $ 19.84万
• 依托单位: Trinity University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2052111&HistoricalAwards=false
• 关键词: RUI; Collaborative; Research; Testing; models

The proposed research will improve the understanding of the development of the North American continental margin in southern Oregon and northern California just prior to and during a critical and poorly understood period of contractional deformation. During this time (the Latest Jurrassic), mountain building closed the Galice and Mariposa sedimentary basins in the western Klamath and Sierra mountains, respectively. Details of the basins’ sediment sources, depositional ages, and extent of metamorphism and deformation may provide the best geologic record just prior to and during the mountain-building event. The project provides key educational benefits for students at the undergraduate and graduate level, requiring integration of a range of disciplinary knowledge and skills that cannot be duplicated in a classroom. The project will recruit women and underrepresented minority students at graduate and undergraduate levels, and these students will be full participants in the research, not observers. The experiential learning through this research will provide skill development and training that will translate directly to the STEM workforce. In addition, field guides highlighting this research and key areas of interest will be broadly disseminated through Forest Service districts and the NSF Flyover Country® app, improving public scientific literacy. The ongoing interest in gold mining and the mining history of the rocks that form the focus of this research increase the likelihood of public engagement.The Upper Jurassic Galice and Mariposa Formations in the Klamath Mountains and western Sierran provinces have long been considered fundamental to understanding the mid-Mesozoic history of the U.S. Cordilleran continental margin. Two opposing tectonic models for the Late Jurassic Nevadan orogeny variously interpret the tectonic setting and age of Galice and Mariposa deposition. The first model invokes the genesis of the Mariposa Formation in an intra-oceanic basin that progressively closed along oppositely dipping subduction zones, while the age-equivalent Galice Formation represents an inter-arc basin native to the western margin of North America. In the second model, both formations occur within transtensional basins above an east-dipping, long-lived subduction zone along the western North American margin. Because these strata constitute the youngest rocks deformed during the Late Jurassic Nevadan deformation, details of depositional age, sediment provenance, and the kinematics and style of deformation are critical to informing the proposed tectonic models and assessing their viability. This comprehensive and integrated analysis of each of these basins that includes petrofacies characterization, detrital zircon U-Pb age and Hf analysis, heavy mineral analysis, interpretation of sedimentary structures, assessment of the degree of metamorphism, and analysis of the timing and kinematics of deformation, will provide a robust framework for modification and refinement of the understanding of the Late Jurassic continental margin.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.

拟议的研究将提高人们对北美连续利润率在俄勒冈州南部和北加州的发展的理解。在此期间（最新的Jurrassic），山区建筑分别关闭了西部克拉马斯和塞拉山脉的Galice和Mariposa Sedimentary Basses。贝斯的沉积物来源，存放年龄以及变质和变形的程度的细节可以在山区建造事件发生前和期间提供最佳的地质记录。该项目为本科和研究生层面的学生提供了重要的教育利益，需要整合一系列在课堂上无法复制的学科知识和技能。该项目将在研究生和本科阶段招募妇女和代表性不足的少数族裔学生，这些学生将成为研究的正常参与者，而不是观察者。通过这项研究的专家学习将提供技能发展和培训，将直接转化为STEM劳动力。此外，野外指南强调这项研究和关键领域将通过森林服务区和NSF天桥®应用程序广泛传播，从而提高公共科学素养。构成这项研究重点的岩石开采以及岩石的采矿历史的持续兴趣增加了公众参与的可能性。侏罗纪的侏罗纪杯和马里波萨山脉和玛丽波萨岩层和西部塞兰的规定长期以来一直被认为是理解美国山内山脉持续美食的中生代中生代历史的基础。晚期侏罗纪内华达造山造成的两个相反的构造模型各种各样的构造环境和年龄和马里波萨沉积的年龄。第一个模型在沿着倾斜的俯冲带逐渐闭合的海洋内盆地中引用了Mariposa形成的起源，而年龄相等的杯状形成代表了北美西部边缘的弧形间盆地。在第二个模型中，这两种地层都发生在北美西部边缘的向东倾斜，长期俯冲带上方的变换鲈鱼内。由于这些地层构成了晚期侏罗纪内瓦丹变形期间最年轻的岩石，因此沉积年龄，沉积物出处的细节以及运动学和变形的风格对于告知拟议的构造模型并评估其生存能力至关重要。对包括质量表征的每种鲈鱼的全面和综合分析NSF的法定使命，并使用基金会的知识分子优点和更广泛的审查标准来评估，被认为是宝贵的支持。