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.

该提案的目的是解决与火山科学中的基本问题有关，与华盛顿州北部的科马·库尔山（Koma Komekulshan）（贝克山）爆发的熔岩的地球化学和矿物学研究有关。美国有几个具有火山活跃的地区，其中包含“非常高的威胁”火山，包括Koma Kulshan。虽然位于人口稠密的地区，但Koma Kulshan仍然被了解。该提案调查了导致Koma Kulshan和相关时间尺度爆发的过程，以更好地告知对危害缓解危险计划的回应，并在未来的爆发中得到缓解计划。这项工作还将通过夏季Koma Kulshan实地经验为STEM中边缘化群体的学生提供基于地的学习机会，这是华盛顿州立机构的长期夏季野外经验，包括西北印度学院，Whatcom社区学院和Yakima Valley College。其他具有免费科学专业知识和不同职业阶段的特性身份的三个PI将领导这一协作项目，并将为华盛顿州的本科生和研究生的多层研究的框架提供一个框架。该提议概述了对Lavas和Tephra沉积物的研究。它提供了一种综合方法，该方法结合了经过验证的岩石学技术（即矿物化学，质地和热压体法）与破坏新基础的方法（即机器学习，扩散时间表以及熔体夹杂物中的重建挥发物）。所得数据将用于重建弧形地壳中岩浆存储的结构，并量化岩浆存储的时机和在喷发事件树之前的爆发 - 钥匙因素和喀斯喀特火山天文台实施的危害缓解计划所需的损失因素。 Kulshan Lavas为这项研究提供了一个独特的样品集，因为先前的工作已经确定了不同的晶体簇和共结晶组合，这些组合代表了10千年来喷发时拍摄的经trans壳系统的不同部分。这项工作提供了测试经过时光岩浆系统如何通过时间发展并提高我们对全球弧火山的理解的机会。该奖项反映了NSF的法定任务，并通过使用基金会的知识分子和更广泛的影响评估标准来通过评估来表现出珍贵的支持。