Defining the Role of Mixed H2O-CO2 Fluids in the Petrogenesis of Subduction-related Lavas

定义混合 H2O-CO2 流体在俯冲相关熔岩岩石成因中的作用

• 批准号: 0409863
• 负责人: Gordon Moore
• 金额: $ 15.36万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-07-01 至 2006-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0409863&HistoricalAwards=false
• 关键词: Defining; Role; Mixed; H2O; CO2

This research will focus on the effect of mixed volatiles (H2O and CO2) on the evolution of primitive arc-related magmas. As recent evidence has shown the presence of significant amounts of CO2 in arc magmas, and that the thermodynamic behavior of these components appears to be non-Henrian, high pressure and temperature experiments will be conducted on two different (but related) melt compositions in order to 1) determine the solubility relations of mixed H2O-CO2 fluids in the melt phase, and 2) determine the effect of mixed fluid composition on the sub-liquidus phase equilibria. Once determined, these parameters will place the direct measurements of volatile and major-element concentrations in trapped melt inclusions from arc volcanics in a context of melt generation, migration, and segregation in the mantle wedge, greatly increasing our ability to unravel petrogenetic processes giving rise to subduction-related volcanism. This project will be laboratory intensive, engaging undergraduate students in the use of high pressure/temperature experimental apparatus and the subsequent analysis of experimental run products.

本研究将重点研究混合挥发物（H2O和CO2）对原始弧相关岩浆演化的影响。由于最近的证据表明电弧岩浆中存在大量二氧化碳，并且这些成分的热力学行为似乎是非亨利式的，因此将对两种不同（但相关）熔体成分进行高压和高温实验，以便1) 确定混合 H2O-CO2 流体在熔融相中的溶解度关系，2) 确定混合流体成分对亚液相平衡的影响。一旦确定，这些参数将在地幔楔中熔体生成、迁移和分离的背景下直接测量弧火山捕获的熔体包裹体中的挥发性和主要元素浓度，从而大大提高我们揭示岩石成因过程的能力与俯冲有关的火山作用。该项目将是实验室密集型项目，让本科生参与高压/高温实验设备的使用以及实验运行产品的后续分析。