CAREER: Modeling two-phase flow, multi-lithologic melting, and chemical disequilibrium with uranium-series isotopes

职业：用铀系同位素模拟两相流、多岩性熔融和化学不平衡

• 批准号: 2046932
• 负责人: Lynne Elkins
• 金额: $ 69.66万
• 依托单位: University of Nebraska-Lincoln
• 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: 2021-06-15 至 2026-05-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2046932&HistoricalAwards=false
• 关键词: CAREER; Modeling; two; phase; flow

This project aims to explore the origins of magmas using computer models that predict the chemical makeup of lavas, particularly for isotopes that preserve information about rates of melting and magma transport in the Earth’s mantle layer. The project tests for the role of alternative mantle rock types in generating magma, and for the importance of chemical diffusion during magma transport. Questions about magma origins are fundamentally important to our understanding of dynamic global processes and plate tectonics, including the origins of new oceanic crust produced by volcanic eruptions. The project further aims to develop a computer modeling program housed at the University of Nebraska to train the next generation of geoscience computer modelers, and to increase public engagement and literacy with STEM through broader outreach. Modeling techniques and tutorials will be hosted and managed online in an open-source code repository and educational library.The roles and importance of recycled mantle lithologies in mantle melting and basalt generation and of the influence of slow chemical diffusion on multi-lithologic partial melting remain unclear. Uranium-series disequilibria in lavas may provide a method for identifying lithologic source heterogeneity, but U-series modeling remains complex and difficult to replicate. The overall research goal of this study is to test multi-lithologic melting and diffusive exchange through the development of new, open-source modeling packages that predict U-series disequilibria in basalts, and to ground-truth that modeling effort by comparison of existing U-series data with measurements sensitive to the presence of pyroxenite in the melting regime. The educational goals are to incorporate the modeling work into lessons for existing and new geoscience courses and to create and curate digital lessons and training tutorials and share them via an online program. The rationales for this work are to advance the understanding of mantle melting processes, train a future cohort of sophisticated geoscience modelers, and develop widely-accessible and reproducible melt modeling tools that can be integrated into community research and teaching efforts. The outcomes of the project will be amplified through the development of archived, open-source, cloud-hosted modeling code packages.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.

该项目旨在利用计算机模型探索岩浆的起源，这些模型预测熔岩的化学组成，特别是保留有关地球地幔层中熔化和岩浆运输速率信息的同位素。该项目测试了替代地幔岩石类型在生成岩浆中的作用，以及岩浆运输过程中化学扩散的重要性。关于岩浆起源的问题对于我们理解动态全球过程和板块构造，包括火山爆发产生的新洋壳的起源，具有根本性的重要意义。该项目还旨在开发一个计算机建模程序，该程序位于内布拉斯加大学，以培训下一代地球科学计算机建模人员，并通过更广泛的推广活动增加公众对STEM的参与和了解。建模技术和教程将在一个开放源代码储存库和教育图书馆中在线托管和管理。再循环地幔岩性在地幔熔融和玄武岩生成中的作用和重要性以及缓慢的化学扩散对多岩性部分熔融的影响仍不清楚。熔岩中的铀系不平衡可能提供一种识别岩性源非均匀性的方法，但铀系建模仍然复杂且难以复制。本研究的总体研究目标是通过开发新的开源建模包来测试多岩性熔融和扩散交换，该建模包预测玄武岩中的U系列不平衡，并通过将现有的U系列数据与对熔融制度中辉石岩的存在敏感的测量值进行比较来确定建模工作。教育目标是将建模工作纳入现有和新的地球科学课程的课程中，并创建和策划数字课程和培训教程，并通过在线程序共享。这项工作的基本原理是促进地幔熔融过程的理解，培养未来的一批复杂的地球科学建模者，并开发可广泛访问和可重复的熔体建模工具，可以集成到社区的研究和教学工作。该项目的成果将通过开发归档的、开源的、云托管的建模代码包来放大。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。