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华盛顿州北部科马库尔山（贝克山）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以及何时喷发相关的基本问题。包含“极高威胁”火山的地区，包括科马库尔山 虽然位于人口稠密的地区，但科马库尔山的研究相对较少。这项工作还将通过 STEM 为 STEM 边缘群体的学生提供基于地点的学习机会。夏季 Koma Kulshan 实地体验，为来自华盛顿州立大学（包括西北印度学院、霍特科姆社区学院和亚基马谷学院）的专业预科生提供为期一周的夏季实地体验，另外还有三位具有互补科学专业知识和不同身份的 PI。不同的职业阶段将主导这个合作项目，并将为华盛顿州同行机构的本科生和研究生提供多层次的研究指导框架。该提案概述了对过去科马库尔山喷发的熔岩和火山灰沉积物的调查~100 ka。它提供了一种将经过验证的岩石学技术（即矿物化学和结构以及温压测量）与突破性新方法（即机器学习、扩散）相结合的综合方法。所得数据将用于重建弧壳中岩浆储存的结构，并量化喷发前岩浆储存和上升的时间——喷发事件树和减灾计划所需的关键因素。由喀斯喀特火山观测站实施的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代表不同部分的不同晶体凝块和共结晶组合。这项工作提供了测试跨地壳岩浆系统如何随时间演化的机会，并提高了我们对全球弧火山的了解。该奖项反映了 NSF 的法定使命，并被认为值得支持。通过使用基金会的智力优点和更广泛的影响审查标准进行评估。