Three dimensional modeling of dynamic microstructure

地球深部硅酸盐部分的少量熔融对岩石的物理和化学性质产生了不成比例的影响。熔体通常分布在管子、圆盘或口袋中，其尺寸小至人类头发宽度的一小部分。这些不同形状熔体单元的相对丰度既取决于熔融的动力环境，也取决于熔体的化学成分。熔体几何特征，即熔体在这些不同单元中分布的平均描述，通过穿过这些地区的地震波进行采样。破译这些地震波的信号，可以发现与地球深部融化相关的过程。在这个项目中，我们继续开发一个新的理论工具箱-微观地球动力学，以解决地球局部熔融的检测问题？S内部以及熔体储存和分离的动力学问题。我们将使用半解析模型(SAM)和边界元模型(BEM)研究熔体体积分数、润湿行为和变形对物理性质的影响，如弹性模数和熔体流动性。这些模型的输出，动态熔体几何，将被处理以解释在地球深处观察到的各种物理性质的异常。

Small amounts of melting in the silicate part of the Earth's deep interior exert a disproportionate influence on the physical and chemical properties of rocks. Melt is often distributed in tubes, disks, or pockets, whose dimensions are as small as the fraction of the width of a human hair. Relative abundance of these different shapes of melt units depend on both the dynamic environment of melting and chemical composition of the melts. The signature of melt geometry, an averaged description of melt distribution in these various units, is sampled by earthquake waves passing through these regions. Deciphering the signals of these earthquake waves, one can find out about the processes associated with melting in the deep Earth.In this project, we continue to develop a new theoretical toolbox, `microgeodynamics', to address the issues of detection of partial melting in the Earth?s interior and dynamics of melt storage and segregation. We will study the influence of melt volume fraction, wetting behavior, and deformation on the physical properties such as elastic moduli and melt mobility using a SemiAnalytical Model (SAM) and a Boundary Elements Model (BEM). The output of these models, dynamic melt geometry, will be processed to explain observed anomalies in various physical properties in the Earth's deep interior.