Physics of Two-Phase Media: Applications to Earth Evolution

两相介质物理学：在地球演化中的应用

• 批准号: 9205821
• 负责人: David Stevenson
• 金额: $ 18万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-09-01 至 1995-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9205821&HistoricalAwards=false
• 关键词: Physics; Two; Phase; Media; Applications

Many of the problems central to earth structure and history require a deeper understanding of differentiation in a convecting two-phase (liquid-solid) system. Current research indicates no inconsistency between geophysical arguments favoring extensive early melting of the earth (a deep magma ocean) and geochemical arguments, primarily because differentiation does not begin until the system approaches the solidus (melt fraction 20%). The PI will pursue the issue of the extent to which differentiation can take place at this stage and subsequently, through a comprehensive set of analytical and computer model calculations, and combine these with high pressure geochemical data to test the consequences against current earth structure. //

地球结构和历史的许多核心问题需要对对流两相(液-固)系统中的差异有更深的理解。目前的研究表明，支持地球(深岩浆海洋)大范围早期融化的地球物理论点和地球化学论点之间并不矛盾，主要是因为直到系统接近固相线(熔融分数为20%)时才开始分化。PI将通过一套全面的分析和计算机模型计算，并将这些计算与高压地球化学数据相结合，以测试与当前地球结构的后果，从而探讨在这个阶段以及随后可以在多大程度上发生差异的问题。//