CAREER: Resolving the detrital thermal signatures and natural biases of sediment recycling and weathering in orogenic systems

职业：解决造山系统中沉积物回收和风化的碎屑热特征和自然偏差

• 批准号: 2045695
• 负责人: Julie Fosdick
• 金额: $ 58.79万
• 依托单位: University of Connecticut
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-07-01 至 2026-06-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2045695&HistoricalAwards=false
• 关键词: CAREER; Resolving; detrital; thermal; signatures

The weathering and erosion of the continents is a central component of the rock cycle and modification of the Earth’s surface. Yet, a fundamental problem in Earth sciences is the intrinsic difficulty in recognizing sediment derived from the erosion of primary crystalline rocks versus sediment that may represent multiple episodes of weathering, erosion, and transport. Resolving these differences is essential to understanding the growth of the continental crust, continental-scale river drainage reversals, and glacial-interglacial landscape change. This project will focus on the signals of recycling on the geochemistry of detrital minerals during the evolution of the Sierras Pampeanas province of South America. The Sierras Pampeanas are the modern archetype for the lithospheric response to flat slab subduction and an ideal setting to develop improved metrics for geochemical signatures of recycling needed to better understand the evolution of the continental lithosphere. Educational activities focus on increasing participation and retention of under-represented groups in STEM (science, technology, engineering and mathematics) by bridging high school through graduate school laboratory and field experiences. Partnership with the University College Access Program at the University of Connecticut will develop summer internships designed for high school students to gain early exposure to Earth sciences. Geologic field trips in the Hartford Rift Basin, hands-on and virtual laboratory experiments in thermochronology, and mentoring by undergraduate and graduate students will broaden student interns’ experiences and success in higher education STEM opportunities. Graduate student training in thermochronology will contribute towards a stronger technical workforce in support of major instrumentation and technological initiatives in the Earth sciences. Project collaborations will enhance research infrastructure and education technology transfer among collaborating U.S. and Argentine institutions.This project centers on advancing scientific knowledge of the controlling factors and diagnostic geochemical signatures of sediment recycling during the evolution of the continental lithosphere. By using the emerging detrital monazite thermochronometer alongside established zircon geochronology, thermochronology, and sedimentary compositional archives, an integrated sedimentary provenance analysis will capture the discrete polycyclic histories of continental growth and basin evolution in the Sierras Pampeanas. Research components of the program include: (1) fieldwork and sample collection, (2) detrital zircon geochronology and thermochronometry, (3) development of detrital monazite double-dating thorium-lead-helium (Th-Pb-He) thermochronometry, (4) compositional provenance analysis, and (5) synthesis and thermal history modeling of datasets to explore how different sediment recycling scenarios impact detrital datasets. This research will generate detrital fingerprinting and source characterization of the Sierras Pampeanas to track the influence of pre-existing structures and basin inversion on sediment transfer during flat-slab deformation; streamlined analytical workflows for detrital monazite geochronology, geochemistry, and thermochronometry; and development of a new multiproxy metric for sediment recycling in polycyclic settings. These fundamental advances have wide-ranging applicability in the Earth sciences for correctly quantifying continental weathering and erosion rates, crustal growth, source-to-sink sediment budgets, and constraining rock deformational histories tied to tectonic and earthquake cycles.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.

连续性的风化和侵蚀是岩石周期的核心组成部分，也是地球表面的修饰。然而，地球科学中的一个基本问题是识别源自原代结晶岩与沉积物的沉积物的内在困难，这可能代表了风化，侵蚀和运输的多个发作。解决这些差异对于理解连续地壳，大陆尺度河流排水逆转和冰川冰上冰川景观的增长至关重要。该项目将重点关注在南美塞拉斯·潘皮亚纳斯省（Sierras Pampianas）进化期间回收碎屑矿物质的信号。 Sierras Pampianas是岩石圈对扁平板俯冲的响应的现代原型，也是开发改进的回收质量标志的改进指标的理想设置，以更好地了解连续岩石圈的演变。教育活动的重点是通过通过研究生院实验室和现场经验桥接高中的STEM（科学，技术，工程和数学）中代表性不足的群体的参与和保留。与康涅狄格大学大学学院访问计划的合作伙伴关系将开发夏季实习，旨在为高中生提早接触地球科学。 Hartford Rift盆地，动手和虚拟实验室实验的地质野外旅行以及本科生和研究生的心理实验将扩大学生实习生在高等教育STEM机会方面的经验和成功。热量研究的研究生培训将有助于更强大的技术劳动力，以支持地球科学中的主要仪器和技术计划。项目合作将在美国和阿根廷机构合作之间加强研究基础设施和教育技术的转移。该项目在连续石圈的演变过程中促进对控制因素和诊断性地球化学签名的科学知识的中心。通过使用新兴的碎屑式独居石热力学计与已建立的锆石年代学，热量体学和沉积复合档案库一起，集成的沉积物出处分析将捕获Sierras Pampenas中大陆生长和盆地演化的离散多环历史。该计划的研究组成部分包括：（1）野外作业和样本收集，（2）碎屑锆石的天代学和热化学计算，（3）开发危险的单唑岩双重胸腔thorem-led-lead-helium（th-pb-he）热化学方法，（4）构成源分析和（5）构成史的序列模型，以探索方式，以探索不同的序列模型。碎屑数据集。这项研究将产生Sierras Pampianas的碎屑指纹和源表征，以跟踪现有的结构和盆地倒置对扁平套装变形过程中沉积物转移的影响；精简的分析工作流程，用于碎屑独居石，地球化学和热量学计；并开发用于多环境中沉积物回收的新的多氧指标。这些基本进步在地球科学中具有广泛的可用性，可以正确量化连续的风化和侵蚀率，地壳增长，来源与阵线的沉积物预算以及与构造和地震周期相关的限制岩石宣言历史的限制。这一奖项反映了NSF的法定任务和范围的范围，这对构成了构成的依据。