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.

这项研究将侧重于混合挥发物（H2O和CO2）对原始弧相关岩浆的演变的影响。由于最近的证据表明，在电弧岩浆中存在大量CO2的存在，并且这些成分的热力学行为似乎是非亨利安，高压和温度实验将在两个不同的（但相关的）熔体组合物上进行，以至于1）确定混合融合相位的混合级别的相互序列，并确定混合相位的效果。一旦确定，这些参数将在熔融楔的融化，迁移和隔离的背景下，将挥发性和主要元素浓度的直接测量在地幔楔形的背景下进行，从而大大提高了我们揭开petrogogenentic过程的能力，从而使俯冲降低的火山降低了。该项目将是实验室密集型，吸引的本科生，用于使用高压/温度实验仪以及随后对实验运行产品的分析。