Collaborative Research: The Record of Recharge and Storage in the El Chichon Magma System through Ar Isotopic and Experimental Petrologic Constraints

该项目由岩石学和地球化学(EAR)和美洲计划(OISE)联合支持，将重点研究墨西哥El Chichon火山喷发活动的元素。该项目计划寻求更好地限制岩浆注入的影响，以及过去8000年来岩浆注入和喷发活动之间的时间。在El Chichon，这些调查将涉及研究火山中暴露的喷流火山产物，以确定任何单独的岩浆批次，探测封闭和开放系统的岩浆行为，追踪岩浆体及其随时间的相互作用，并确定岩浆储存条件(压力、温度、挥发分含量)随时间的变化。这些目标将通过分析受地层控制的样品中的Ar同位素，并结合单矿物晶体中的结构和成分变化来确定喷发时的岩浆条件来实现。对El Chichon火山活动的演化和喷发历史进行更详细的分析，将有助于更好地了解岩浆系统与由此导致的墨西哥火山喷发之间的关系。这样的理解将提高我们预测其未来喷发行为的能力。该项目是阿拉斯加州费尔班克斯大学、德克萨斯大学奥斯汀分校和墨西哥国立自治大学之间的合作项目，将支持这三个机构之间的研究生和科学交流。

This project, supported jointly by the Petrology and Geochemistry (EAR) and the Americas Program (OISE), will focus on elements of the eruptive activity of the El Chichon volcano in Mexico. The project plan seeks to better constrain the effects of magma injection and the time between injection and eruption activity over the past 8,000 years. At El Chichon, these investigations will involve studying the effusive volcanic products exposed at the volcano in order to identify any separate magma batches, detect closed- versus open-system magmatic behavior, track magma bodies and their interactions through time, and identify changes in magma storage conditions (pressure, temperature, volatile contents) through time. These objectives will be met by analyzing stratigraphically controlled samples for argon isotope, and combining those with textural, and compositional variations in single mineral crystals, to determine magma conditions at the time of eruption. A more detailed analysis of the evolution and eruptive history of El Chichon activity will allow a better understanding of the relationships between magma systems and resulting eruptions of this Mexican volcano. Such understanding will enhance our ability to forecast its future eruptive behavior. This project is a collaborative project between the University of Alaska Fairbanks, University of Texas at Austin, and the Universidad Nacional Autonoma de Mexico and will support graduate students and scientific exchanges between the three institutions.