Phase Equilibria and Speciation of Water and Carbon Dioxide in Silicate Melts

硅酸盐熔体中水和二氧化碳的相平衡和形态

• 批准号: 9219899
• 负责人: Edward Stolper
• 金额: $ 45.99万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-03-01 至 1997-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9219899&HistoricalAwards=false
• 关键词: Phase; Equilibria; Speciation; Water; Carbon

This ongoing project is designed to examine the behavior of water and carbon dioxide (the most abundant volatile components in terrestrial igneous rocks) in model and natural igneous systems. These components have significant effects on the behavior of silicate melts, and a knowledge of these effects is fundamental to understanding magma origin and evolution. The proposed work involves application of experimental petrology and analytical techniques to measure the bulk concentrations of H2O and CO2 and the concentrations of individual H- and C- bearing species in synthetic and natural glasses. The specific problems to be addressed include: mixed volatiles in silicate melts and glasses at elevated pressures; 13C/12C fractionation between vapor and silicate melts; measurement of the H2O and CO2 concentrations of natural volcanic glasses; measurement of H2O/CO2 ratios of individual bubbles in volcanic glasses; and experimental investigation of the effect of water on the degree of partial melting of mantle peridotite.

这个正在进行的项目旨在研究模型和天然火成岩系统中水和二氧化碳（陆地火成岩中最丰富的挥发性成分）的行为。 这些成分对硅酸盐熔体的行为具有重大影响，了解这些影响对于了解岩浆起源和演化至关重要。 拟议的工作涉及应用实验岩石学和分析技术来测量合成和天然玻璃中 H2O 和 CO2 的总体浓度以及单个含氢和含碳物质的浓度。 要解决的具体问题包括：高压下硅酸盐熔体和玻璃中的混合挥发物；蒸气和硅酸盐熔体之间的 13C/12C 分馏；天然火山玻璃中H2O和CO2浓度的测量；测量火山玻璃中单个气泡的 H2O/CO2 比率；以及水对地幔橄榄岩部分熔融程度影响的实验研究。