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

泥柱磁性的动力学：有关颗粒流体输送的实验EAR-0207254PI：沼泽将岩浆输送到大型火山中心的管道系统的性质和行为可以视为岩浆泥柱。岩浆柱被设想为垂直扩展的水平板片(或窗台)和岩浆室的堆叠，这些岩浆室通过向下延伸长达50公里的管状和/或岩墙状导管网络相互连接。由于它们的寿命和复杂性，碎屑柱可能在岩浆演化和类地行星的一般地质演化中发挥核心作用。岩浆柱动力学可能是理解岩浆作用与火山作用之间、喷发流量与岩浆成分之间、洞室与导管几何形状与堆积层形成之间、管道堵塞与火山震动之间、岩浆运移与层状侵入体之间等许多问题之间的联系的核心。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上升通过一系列相互连接的岩浆室时的动力学。携带颗粒的流体将被用来模拟岩浆携带晶体，其中流体以及颗粒的大小和密度经过精心选择，以实现与真实系统中的熔体和晶体的动态相似性。比例尺模型管道的几何形状将基于对真实火山系统的地球物理和地质研究。这个项目的一个主要目标是详细描述晶体的损失、增加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。用一个简单的比例尺模型进行的一系列勘察实验表明，这种方法研究富晶体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.