The Record of Recharge, Assimilation, and Storage in the Popocatepetl Magma System from Sr Isotopes and Glass Inclusions in Phenocrysts and Experimental Petrologic Constraints

波波卡特佩特尔岩浆系统中斑晶中锶同位素和玻璃包裹体的补给、同化和储存记录以及实验岩石学约束

• 批准号: 0711043
• 负责人: James Gardner
• 金额: $ 25.44万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-07-01 至 2011-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0711043&HistoricalAwards=false
• 关键词: Record; Recharge; Assimilation; Storage; Popocatepetl

Intellectual merit. Explosive silicic volcanism poses a major societal threat, yet the underlying causes for large Plinian eruptions remain unclear. Several contributing factors include [1] the relative contributions of different processes (e.g., fractional crystallization, recharge by new magma, interaction of magma and wall rocks) that control volumes and compositions of magma reservoirs, [2] the role of volatile components (e.g., H2O, CO2, S, Cl, F) in controlling magma properties and exsolution of a separate fluid phase, and [3] temporal variations in the geometry of magma plumbing systems. A detailed study of Popocatepetl volcano, located on the fringe of Mexico City, is proposed to evaluate temporal variations and how these factors correlate with eruptive style over the past 23,000 years of activity (as deciphered from tephrochronology records). During this period, at least seven significant Plinian eruptions of dramatically different volumes have occurred. The eruptive products will be characterized to unravel magma evolution and volatile contents, primarily via detailed study of individual phenocrysts and trapped melt inclusions therein using multiple quantitative analytical methods (electron microprobe, laser ablation ICPMS, FTIR) and experimental simulations.Broader impacts. The project will support two Ph.D. students, one of whom is a Mexican national, and several undergraduate students. The project will also benefit from direct collaboration with Dr. Claus Siebe (UNAM, Mexico city), who has documented the eruptive history of the volcano via detailed tephrochronology work in the region. This collaboration will result in significant technology transfer between the US and Mexico, and will undoubtedly contribute to understanding of volcanic hazards in the area.

智力优点。 爆炸性的硅化火山构成了重大的社会威胁，但大型plinian爆发的根本原因尚不清楚。 几个促成因素包括[1]不同过程（例如，岩浆的分数结晶，充电，岩浆和壁岩石的相互作用）的相对贡献，这些过程控制岩浆储层的体积和组成[2]伏击组件的作用，例如，伏击组件的作用岩浆管道系统几何形状的时间变化。提出了一项位于墨西哥城边缘的PopocatePetl火山的详细研究，旨在评估时间变化以及这些因素与过去23，000年的活动中如何与喷发风格相关联（根据Tephrochonology Records的解密）。 在此期间，至少发生了七次明显的Plinian喷发，发生了巨大的不同体积。 喷发产物将以详细研究使用多种定量分析方法（Electron Microprobe，Laser Ablation ICPMS，FTIR）和实验模拟。BROACHER.BORACHER撞击。该项目将支持两个博士学位。学生，其中一位是墨西哥国民和几个本科生。该项目还将受益于与Claus Siebe博士（墨西哥城）的直接合作，后者通过该地区的详细TephroConology工作记录了火山的爆发历史。 这项合作将导致美国和墨西哥之间的大量技术转移，无疑将有助于了解该地区的火山危害。