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

浆液柱岩浆活动动力学：含颗粒流体输运的实验浆液把岩浆输送到大型火山中心的管道系统的性质和行为可以看作是岩浆浆液柱。岩浆柱被设想为由水平岩浆片（或基岩）和岩浆室组成的垂直延伸的堆栈，由管道状和/或堤状的管道丛连接，向下延伸长达50公里。由于它们的寿命和复杂性，泥柱可能在岩浆的演化和类地行星的一般地质演化中起着核心作用。泥柱动力学可能是理解岩浆活动和火山活动之间、喷发通量和岩浆组成之间、室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、岩浆运输和层状侵入之间以及许多其他问题之间联系的核心。该项目将设计并建造一个泥柱的比例模型，以实验研究岩浆在通过一系列相互连接的岩浆室上升时的动力学。带有颗粒的流体将用于模拟携带岩浆的晶体，其中流体和颗粒的大小和密度都经过精心选择，以实现与真实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基于真实火山系统的地球物理和地质研究。该项目的一个主要目标是详细描述晶体的损失、获得和沉积如何取决于局部和大尺度系统的几何形状以及岩浆通量的大小和时间历史。用简单的比例模型进行的一系列侦察实验表明，这种方法对研究富晶岩浆的运移和侵位是可行的。

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.