Collaborative Research: Using Trace and Ore Elements to Track Volatile Behavior and Fluid Migration within Intermediate-silicic Magma Chambers

合作研究：利用痕量元素和矿石元素追踪中硅质岩浆室内的挥发行为和流体运移

• 批准号: 1219484
• 负责人: James Webster
• 金额: $ 9.93万
• 依托单位: American Museum Natural History
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-08-01 至 2017-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1219484&HistoricalAwards=false
• 关键词: Collaborative; Research; Using; Trace; Ore

The release and movement of magmatic volatile components, including water, carbon dioxide, sulfur, and chlorine, exert significant control on the conditions of volcanic eruptions and on the transport and deposition of potential ore metals. Many of the parameters critical for understanding these processes are invisible to direct observations because they occur up to several kilometers beneath the surface of the Earth. Researchers have suggested that other trace elements both in the magma and in crystals forming within it may be used as a proxy for interpreting volatile behavior in magma and fluids. However many of the basic variables which describe how these elements are incorporated into crystals are unknown or are in question. This study builds off observations about enrichment in different trace elements analyzed in crystals from the recent eruption (2004) of Mount St. Helens by 1) conducting hydrothermal experiments at various conditions to try to better constrain many of these questionable variables and 2) expand on the work at Mount St. Helens to look for similar elemental variations at other volcanoes, including Mt. Pinatubo, Philippines; Augustine volcano, Alaska; and Mt. Guardia, Lipari. Specifically, this work will focus on an experimental and analytical study of the elements, Li, Cu, Zn, Pb, W, and Mo. These elements are of particular interest as prior studies have suggested they are likely to be transported by volatiles (such as water, CO2, etc). The experimental results will be integrated with observations from multiple volcanic centers to fully understand the origins of these element enrichments and how this relates to the movement of volatiles in silicic magma systems and how volatile transfer influences processes of eruption and mineral deposit formation.

岩浆挥发性成分的释放和运动，包括水，二氧化碳，硫和氯，对火山喷发的条件以及潜在矿石金属的运输和沉积产生了重大控制。理解这些过程至关重要的许多参数对于直接观察是看不见的，因为它们发生在地球表面以下几公里。 研究人员建议，岩浆和其中形成的晶体中的其他微量元素可以用作解释岩浆和流体中挥发性行为的代理。 但是，许多基本变量描述了如何将这些元素纳入晶体的方式是未知或有问题的。 这项研究建立了关于在最近的晶体中分析的不同痕量元素（2004年）在圣海伦斯山（Mount St. Helens）中分析的富集的观察结果。阿拉斯加奥古斯丁火山；和Lipari的Guardia山。具体而言，这项工作将集中于对LI，Cu，Cu，Zn，Pb，W和Mo的实验和分析研究。这些元素特别有趣，因为先前的研究表明它们很可能是由挥发物（例如水，CO2等）运输的。 实验结果将与来自多个火山中心的观察结果整合在一起，以充分了解这些元素富集的起源，以及这与硅质岩浆系统中挥发物的运动以及挥发性转移如何影响喷发和矿物沉积形成过程。