Laboratory Experiments, Numerical Calculations and Petrologic Applications of Crystal Growth and Dissolution in a Multicomponent Silicate Melt and a Crystal-Melt...

9706031 Liang这个为期一年的试点项目是一个结合实验室和数值研究的晶体生长和溶解在三元CaO-Al 2 O3-SiO2系统。 研究将解决两个主要问题：（1）耦合化学扩散在熔融硅酸盐熔体中晶体生长和溶解中的作用，以及（2）晶体-熔体或糊状物-熔体界面处局部热力学平衡的假设。 实验室实验将涉及材料合成、液相线表面的测定、单晶和多晶材料的扩散控制溶解以及晶体-熔体糊状物的扩散控制溶解，所有这些都在1500 ℃和1 GPa下进行。 这项研究将为今后在更复杂的系统中的溶解研究以及自由对流辅助溶解的研究奠定基础。 这些研究有可能阐明大规模的岩浆房，小规模的火成岩结构和动力学，矿物生长速率的模型。

9706031 Liang This one-year pilot project is a combined laboratory and numerical study of crystal growth and dissolution in the ternary CaO-Al2O3-SiO2 system. The study will address two major questions: (1) the role of coupled chemical diffusion in crystal growth and dissolution in molten silicate melts, and (2) the assumption of local thermodynamic equilibrium at the crystal-melt or mush-melt interface. The laboratory experiments will involve material synthesis, determination of liquidus surfaces, diffusion controlled dissolution of single crystals and polycrystalline materials, and diffusion controlled dissolution of a crystal-melt mush, all at 1500oC and 1 GPa. This study will set the stage for future studies of dissolution in more complicated systems and also for studies of free convection assisted dissolution. Such studies have the potential to elucidate large scale structure and dynamics of magma chambers, small scale igneous textures, and models for mineral growth rates.