Developments and Applications of Self-Consistent Models of Crystal-Melt Interaction in Molten and Partially Molten Silicates

熔融和部分熔融硅酸盐中晶体-熔体相互作用自洽模型的发展和应用

• 批准号: 0208141
• 负责人: Yan Liang
• 金额: $ 27.37万
• 依托单位: Brown University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-07-01 至 2005-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0208141&HistoricalAwards=false
• 关键词: Developments; Applications; Self; Consistent; Models

LiangEAR-0208141During their migration towards the surface or subsurface storage areas, magmas generated deep in the Earth interior will inevitably react with the wallrocks and their host porous crystalline matrices. The proposed research is a combined laboratory and numerical study of the kinetic of crystal-melt and rock-melt reaction in the Earth upper mantle and lower crust. The laboratory part of the project involves dissolution studies of mantle rocks and minerals (olivine, pyroxenes and garnet) in molten silicates of andesitic to picritic compositions. Theoretical and numerical studies of crystal-melt interaction will focus on two length scales: grain scale and continuum scale. Once coupled with laboratory experiments, studies of grain scale processes will help us to identify crystal-melt reaction mechanisms, parameterize reaction rates, and improve experimental design. Continuum scale reactive flow models using laboratory calibrated reaction rates and thermodynamic phase relationships will allow us to better constrain melt transport and melt-rock reaction in the upper mantle and lower crust. A combined laboratory and theoretical study of crystal-melt interaction will also allow us to develop new methods that can be used to estimate magma ascent rate and diffusion coefficients in the crystals and melts. A database for chemical diffusion in silicate melts and crystals of mafic compositions will be constructed. This database will be integrated into the graduate and undergraduate geology courses that are taught by the PI at Brown University.

在向地表或地下储存区迁移的过程中，地球内部深处产生的岩浆不可避免地会与围岩及其宿主多孔晶体基质发生反应。提出的研究是对地球上地幔和下地壳中晶体熔融和岩石熔融反应动力学的实验室和数值研究相结合的研究。该项目的实验室部分包括对地幔岩石和矿物（橄榄石、辉石和石榴石）在安山岩至苦荞质组成的熔融硅酸盐中的溶解研究。晶体-熔体相互作用的理论和数值研究将集中在两个长度尺度上：晶粒尺度和连续尺度。一旦与实验室实验相结合，晶粒尺度过程的研究将有助于我们确定晶体-熔体反应机理，参数化反应速率，改进实验设计。使用实验室校准的反应速率和热力学相关系的连续尺度反应流动模型将使我们能够更好地约束上地幔和下地壳中的熔体运输和熔融岩反应。晶体-熔体相互作用的实验室和理论研究也将使我们能够开发新的方法，用于估计岩浆在晶体和熔体中的上升速率和扩散系数。将建立一个化学扩散在硅酸盐熔体和镁基成分晶体中的数据库。该数据库将被整合到布朗大学PI教授的研究生和本科生地质学课程中。