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

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将不可避免地与围岩及其宿主多孔结晶基质发生反应。该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涉及对地幔岩石和矿物（橄榄石、辉石和石榴石）在安山质至苦橄质成分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尺度上：晶粒尺度和连续尺度。一旦与实验室实验相结合，对晶粒尺度过程的研究将有助于我们确定晶体-熔体反应机制，参数化反应速率，并改进实验设计。利用实验室标定的反应速率和热力学相位关系建立的连续介质反应流模型将使我们能够更好地约束上地幔和下地壳的熔体输运和熔体-岩石反应。晶体-熔体相互作用的实验室和理论研究相结合，也将使我们能够开发新的方法，可用于估计岩浆上升速率和扩散系数的晶体和熔体。将建立一个硅酸盐熔体和镁铁组成的晶体中化学扩散的数据库。这个数据库将被整合到研究生和本科生的地质课程，是由PI在布朗大学教授。

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.