Collaborative Research: Synthesizing arc-scale geochemical, petrologic, and geophysical datasets to investigate causes of volcanic diversity in the Cascade Arc

合作研究：综合弧级地球化学、岩石学和地球物理数据集，研究喀斯喀特弧火山多样性的原因

• 批准号: 1949173
• 负责人: Christy Till
• 金额: $ 26.27万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-07-01 至 2024-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1949173&HistoricalAwards=false
• 关键词: Collaborative; Research; Synthesizing; arc; scale

Subduction zones – locations where one of the Earth’s tectonic plates are pushed beneath another – are one of the most volcanically active environments on the planet. Decades of study on subduction zones have provided insight into the overarching processes that produce the magmas erupted, how the erupted magmas are produced at individual volcanoes, and a number of related questions. Despite this progress, a complex and largely unsolved problem is the cause of ubiquitous and dramatic variations in the amount and composition of magmas that erupt at volcanoes within the same subduction zone. Do these reflect processes acting deep within the Earth’s mantle, or in the overlying crust? Addressing this problem has important implications for understanding magma production and volcanic hazards, as worldwide almost a billion people live at risk from volcanoes. There is also a potential for scientific breakthrough by utilizing the existing large data sets acquired from recent NSF investments such as the MARGINS, GeoPRISMS, and EarthScope programs. However, addressing the question has proven challenging to date in part because of a lack of critical data for some locations, but largely because of the lack of suitable tools and approaches that allow us to quantitatively synthesize and compare the existing large data sets. Thus, this is a multidisciplinary study to conduct a quantitative comparison of existing large geophysical and compositional datasets at the spatial scales of the entire Cascades subduction zone, linked through sets of common intensive variables such as heat and density, to determine the primary drivers of intra-arc magmatic diversity. Building on a successful Proof of Concept project that demonstrates the promise of the approach (Till et al., 2019), the project will test hypotheses about the relative roles of mantle magmatic flux vs. crustal characteristics and crustal magma storage depths in producing variations in erupted compositions and fluxes, and in controlling the geophysical state of the crust along strike in the Quaternary Cascades arc. The project has the potential to transform our understanding of these important regions and will produce a number of important broader impacts including, catalyzing interdisciplinary collaborations between three PI’s at three institutions, producing expert datasets widely and easily available to the Earth Science community, supporting undergraduate experiential learning activities. Specifically, it will implement a new multi-year undergraduate research program CONVEcT program (Central Oregon Network for Volcano Education and Training) with research cohorts from Arizona State, Oregon State and Cornell Universities.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.

俯冲带（地球上一个构造板被推下另一个板块）的位置是地球上最有活跃的环境之一。数十年来对俯冲区的研究提供了对产生岩浆爆发的总体过程，如何在单个火山上产生的岩浆以及许多相关问题的洞察力。尽管取得了这种进步，但一个复杂且在很大程度上没有解决的问题是岩浆在同一俯冲带内爆发的岩浆的数量和成分无处不在的原因。这些反映了在地球地幔中或覆盖地壳内部作用的过程？解决这个问题对了解岩浆生产和火山危害具有重要意义，因为全世界有近十亿人受到火山的风险。通过使用从最新的NSF调查（例如利润率，地质主义和地球景观计划）获得的现有大型数据集，也有可能进行科学突破。但是，解决这个问题已被证明是迄今为止的挑战，部分原因是某些位置缺乏关键数据，但很大程度上是因为缺乏合适的工具和方法，这些工具和方法使我们能够定量合成并比较现有的大数据集。这是一项多学科研究，旨在对整个级联俯冲带的空间尺度进行现有大型地球物理和组成数据集进行定量比较，并通过一组常见的密集型变量（如热量和密度）（例如热量和密度）链接，以确定Arc-arc磁带多样性的主要驱动因素。在一个成功的概念验证项目的基础上，该项目将证明该方法的希望（Till等，2019），该项目将测试有关地幔岩浆磁通量与地壳特征与地壳岩浆储存深度在产生爆发的组成和磁盘状态的相对角色中的相对作用的假设。该项目有可能改变我们对这些重要地区的理解，并将产生许多重要的广泛影响，包括催化三个PI在三个机构的PI之间进行跨学科的合作，从而为地球科学界提供了广泛的专家数据集，并为地球科学界易于使用，以支持培训不足的体验学习活动。特别是，它将通过来自亚利桑那州，俄勒冈州立大学和康奈尔大学的研究队列，实施一项新的多年本科研究计划对流计划（俄勒冈州中部的火山教育和培训网络）。这项奖项反映了NSF的法定任务，并通过评估该基金会的知识分子功能和广泛的影响来评估NSF的法定任务，并被认为是珍贵的支持。

项目成果

More Mantle, More Melt: Modeling the Mantle-derived Causes of Heterogeneity in Volumetric Magmatic Flux

地幔越多，熔化越多：模拟体积岩浆通量中地幔来源的不均质性原因

• 发表时间: 2023
• 期刊: IAVCEI proceedings in volcanology
• 作者: Goltz, A.E.

Barometers Behaving Badly I: Assessing the Influence of Analytical and Experimental Uncertainty on Clinopyroxene Thermobarometry Calculations at Crustal Conditions

气压计表现不佳 I：评估分析和实验不确定性对地壳条件下单斜辉石温压计算的影响

• DOI: 10.1093/petrology/egac126
• 发表时间: 2023
• 期刊: Journal of Petrology
• 影响因子: 3.9
• 作者: Wieser, Penny E;Kent, Adam J;Till, Christy B;Donovan, John;Neave, David A;Blatter, Dawnika L;Krawczynski, Michael J
• 通讯作者: Krawczynski, Michael J