Collaborative Research: Eruptive Potential of Silicic Magmas: Thermodynamic and Fluid Dynamics Modeling, and Implications to the Evolution of Selected Natural Systems

合作研究：硅质岩浆的喷发潜力：热力学和流体动力学建模，以及对选定自然系统演化的影响

• 批准号: 0948734
• 负责人: Mark Ghiorso
• 金额: $ 14.13万
• 依托单位: OFM Research
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-07-01 至 2012-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0948734&HistoricalAwards=false
• 关键词: Collaborative; Research; Eruptive; Potential; Silicic

Magma eruptions are fascinating phenomena that have captured the attention of humanity for millennia. They also represent a significant natural hazard. This project is concerned with fundamental questions regarding eruptive systems: Why do some silicic magmas erupt while others stall in the subsurface? Why do some magmas erupt effusively (i.e. as lava flows) while others do so explosively? Are these different magmas that are predestined to different eruptive potential and style, or are they similar magmas subject to different contingencies? Much attention has been given to the importance of external triggers (e.g. earthquakes) in initiating eruptions. Many lines of evidence suggest, however, that eruption triggers are only effective to the extent that a magma body is already primed to the point where eruption is already very likely or inevitable. The fundamental question that this project aims to address is what is the path for priming of a magmatic body? The project will explore the importance of the internal evolution (i.e. crystallization, bubble formation, and magma evolution) of silicic magmas to eruptive potential, and in particular, to explosive potential. A combination of thermodynamic and fluid dynamics modeling will be employed, using selected natural systems as inspiration and guides to exploring the parameter space of the models. While the research being conducted is academic in nature, it will help further the understanding of the eruptive potential of magmatic systems, and may eventually help volcanologists concerned with systems that directly affect society.As part of this project, a thermodynamic model that can appropriately describe the evolution of high-silica systems will be developed, and it will be coupled with new and existing models of the dynamics of the chamber itself and of its walls. Modeling tools developed under this project will be made available to the scientific community as standalone software, web services, and browser-based web clients that will permit users to apply these tools to their own scientific questions and teaching needs. Natural systems to be studied include the Bishop Tuff (CA), Peach Spring Tuff (AZ-NV-CA), and the Highland Range Volcanics (NV), taking advantage of their unique magmatic and eruptive histories to assess some of the first order controls on the eruptive potential of silicic magmas.

岩浆喷发是吸引人类注意力数千年的迷人现象。它们也是一种重大的自然灾害。这个项目关注的是关于喷发系统的基本问题：为什么有些岩浆喷发，而另一些则在地下停滞？为什么有些岩浆是喷涌而出的（如熔岩流），而另一些则是爆炸性的？这些不同的岩浆是注定了不同的喷发潜力和风格，还是它们是相似的岩浆，受到不同的偶然性？外界触发因素（如地震）在引发火山爆发方面的重要性已受到极大关注。然而，许多证据表明，喷发触发器只有在岩浆体已经被引发到喷发已经非常可能或不可避免的程度时才有效。这个项目旨在解决的基本问题是岩浆体的启动路径是什么？该项目将探讨岩浆内部演化（即结晶、气泡形成和岩浆演化）对喷发潜力，特别是爆炸潜力的重要性。将采用热力学和流体动力学建模的组合，使用选定的自然系统作为灵感和指导，探索模型的参数空间。虽然正在进行的研究是学术性的，但它将有助于进一步了解岩浆系统的喷发潜力，并可能最终帮助关心直接影响社会的系统的火山学家，作为该项目的一部分，将开发一个能够适当描述高硅系统演变的热力学模型，并且它将与新的和现有的腔室本身及其壁的动力学模型相结合。在该项目下开发的建模工具将作为独立软件、网络服务和基于浏览器的网络客户端提供给科学界，允许用户将这些工具应用于自己的科学问题和教学需求。要研究的自然系统包括主教凝灰岩（CA），桃泉凝灰岩（AZ-NV-CA），和高地范围火山（NV），利用其独特的岩浆和喷发的历史，以评估一些一阶控制火山岩浆的喷发潜力。