Dynamics of Mush Column Magmatism: Experiments Involving Transport of Particle-Laden Fluids

糊状柱岩浆作用动力学：涉及含颗粒流体传输的实验

• 批准号: 0207254
• 负责人: Bruce Marsh
• 金额: $ 22.73万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-06-01 至 2006-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0207254&HistoricalAwards=false
• 关键词: Dynamics; Mush; Column; Magmatism; Experiments

Dynamics of Mush Column Magamtism: Experiments Involving Transport of Particle-Laden FluidsEAR-0207254PI: MarshThe nature and behavior of the plumbing system that carries magma to large volcanic centers can be looked upon as a magmatic mush column. Mush columns are envisioned as a vertically extensive stack of horizontal sheets (or sills) and chambers of magma interconnected by a plexus of pipe-like and/or dike-like conduits stretching downward for distances as great as 50 km. Because of their longevity and complexity, mush columns may play a central role in the evolution of magma and in the general geologic evolution of Earth-like planets. Mush column dynamics may be central to understanding the connections between magmatism and volcanism, between eruptive flux and magma composition, between chamber and conduit geometry and cumulate bed formation, between conduit clogging and volcanic tremor, and between magma transport and layered intrusions, among many other issues. This project will design and build a scale model of a mush column to study experimentally the dynamics of magma charged with crystals as it ascends through a series of interconnected magma chambers. Particle-laden fluid will be used to simulate magma carrying crystals, where the fluid and the sizes and densities of the particles are carefully chosen to achieve dynamic similarity with melt and crystals in a real system. The geometry of the plumbing of the scale model will be based on geophysical and geological studies of real volcanic systems. A primary goal of this project is to delineate in detail how the loss, gain, and deposition of crystals depends on local and large scale geometry of the system and on the magnitude and time history of flux of magma. A series of reconnaissance experiments using a simple scale model has shown the feasibility of this approach to study transport and emplacement of crystal-rich magma.

泥浆柱岩浆活动的动力学：关于携带颗粒的流体的运输的实验P.S. -0207254 PI：Marsh将岩浆运送到大型火山中心的管道系统的性质和行为可以被看作是岩浆泥浆柱。泥柱被设想为垂直延伸的水平岩席（或岩床）和岩浆室的堆叠，这些岩席和岩浆室通过一丛管状和/或堤坝状导管相互连接，向下延伸的距离高达50 km。由于它们的寿命和复杂性，糊状柱可能在岩浆的演化和类地行星的一般地质演化中发挥核心作用。泥柱动力学可能是理解岩浆作用和火山作用之间的联系，喷发通量和岩浆成分之间，室和管道几何形状和堆积层形成之间，管道堵塞和火山震颤之间，以及岩浆运输和层状侵入体之间，以及许多其他问题的中心。该项目将设计和建造一个糊状柱的比例模型，以实验研究充满晶体的岩浆在通过一系列相互连接的岩浆房上升时的动力学。载有颗粒的流体将被用来模拟携带晶体的岩浆，其中流体和颗粒的大小和密度被仔细选择，以实现与真实的系统中的熔体和晶体的动态相似性。比例模型管道的几何形状将以对真实的火山系统的地球物理和地质研究为基础。 该项目的主要目标是详细描述晶体的损失，获得和沉积如何取决于系统的局部和大尺度几何形状以及岩浆流量的大小和时间历史。 一系列使用简单比例模型的勘测实验表明，这种方法研究富晶体岩浆的迁移和侵位是可行的。