Collaborative Research: Phenocryst or not? Using a stratovolcano's crystal cargo to explore crustal-scale magmatic systems, Koma Kulshan (Mt. Baker), Northern Cascade Arc

合作研究：斑晶与否？

• 批准号: 2147954
• 负责人: Susan DeBari
• 金额: $ 33.35万
• 依托单位: Western Washington University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-03-01 至 2025-02-28
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2147954&HistoricalAwards=false
• 关键词: Collaborative; Research; Phenocryst; Using; stratovolcano

The goal of this proposal is to address fundamental questions in volcano science related to how and when volcanoes erupt through a geochemical and mineralogical study of lavas erupted from Koma Kulshan (Mt. Baker) in northern Washington State. The United States has several volcanically active regions that contain “very-high-threat” volcanoes, including Koma Kulshan. While situated in a highly populated area, Koma Kulshan remains relatively understudied. This proposal investigates the processes that lead to eruptions at Koma Kulshan and the associated timescales, to better inform a response to, and aid in, hazard mitigation plans in the event of a future eruption. This work will also provide place-based learning opportunities for students from marginalized groups in STEM through the Summer Koma Kulshan Field Experience, a week-long summer field experience for pre-majors from Washington State institutions including Northwest Indian College, Whatcom Community College, and Yakima Valley College. Additionally, three PIs with complimentary scientific expertise and diverse identities at different career stages will lead this collaborative project and will provide a framework for multi-tiered research mentoring across peer institutions in the state of Washington for undergraduates and graduate students.This proposal outlines an investigation of lavas and tephra deposits erupted from Koma Kulshan over the past ~100 ka. It provides an integrated approach combining proven petrologic techniques (i.e., mineral chemistry and textures and thermobarometry) with methodologies that are breaking new ground (i.e., machine learning, diffusion chronometry, and reconstructed volatiles in melt inclusions). The resultant data will be used to reconstruct the architecture of magma storage in arc crust and quantify the timing of magma storage and ascent prior to eruption–key factors required for eruption event trees and hazard mitigation plans implemented by the Cascades Volcano Observatory. Kulshan lavas provide a unique sample set ideal for this study as previous work has identified distinct crystal clots and co-crystallizing assemblages that represent different parts of a transcrustal system tapped upon eruption over 10s of thousands of years. This work provides the opportunity to test how transcrustal magmatic systems evolve through time and improves our understanding of arc volcanoes globally.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.

该提案的目标是通过对科马库尔山（Mt. Koma Kulshan）喷发的熔岩进行地球化学和矿物学研究，解决火山科学中与火山如何喷发以及何时喷发有关的基本问题。贝克）位于华盛顿州北方。美国有几个火山活跃区，其中包括“非常高威胁”的火山，包括科马库尔山。虽然位于人口稠密地区，但Koma Kulshan仍然相对不足。该提案调查了导致Koma Kulshan火山爆发的过程和相关的时间表，以便在未来发生火山爆发时更好地为应对和援助减灾计划提供信息。这项工作还将通过夏季Koma Kulshan实地体验，为来自STEM边缘化群体的学生提供基于场所的学习机会，为期一周的夏季实地体验为来自华盛顿州立机构的预科生提供，包括西北印度学院，Whatcom社区学院和亚基马山谷学院。此外，三个具有互补的科学专业知识和不同的身份在不同的职业生涯阶段的PI将领导这个合作项目，并将提供一个框架，跨同行机构在华盛顿的本科生和研究生的多层次的研究指导。它提供了一种综合方法，结合了已证实的岩石学技术（即，矿物化学和结构以及热压测定法）与正在开辟新领域的方法（即，机器学习、扩散计时法和熔体包裹体中的重构挥发物）。由此产生的数据将被用来重建弧壳岩浆存储的架构和量化的岩浆存储和上升的时间之前，喷发事件树和减灾计划所需的瀑布火山天文台的火山喷发的关键因素。库尔山熔岩为这项研究提供了理想的独特样本集，因为之前的工作已经确定了不同的晶体凝块和共结晶组合，这些组合代表了数十万年来喷发时跨地壳系统的不同部分。这项工作提供了一个机会，以测试如何跨地壳岩浆系统的演变，随着时间的推移，提高我们对全球弧火山的理解。这个奖项反映了NSF的法定使命，并已被认为是值得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的支持。