Cross-scale modeling of magma migration and storage

熔体在地球深处的迁移和储存在很大程度上受岩石微观结构的控制。在部分熔融的岩石中，熔体沿岩石中矿物颗粒的边角分布在纳米至微米大小的袋状和小管中。这些富含熔体的口袋和小管的形状、分布和连通性决定了熔体在岩石中运输的速度和方向。被熔管和熔袋浸湿的颗粒表面的面积分数控制着大量的物理性质，包括部分熔融岩石的地震特征。这个项目将导致一个理论框架的发展，用于量化部分熔融岩石中熔体管和熔体袋的形状和分布。本项目开发的分析和数值工具将确定控制熔体几何形状的力，预测部分熔融岩石中熔体管和熔体袋在变形力作用下的重新分布，并利用观察到的所谓超低速度带的地震特征来推断地球深处的熔化程度和熔体储存。

Migration and storage of melts in the deep interior of the Earth is largely controlled by the microscopic structure of the rocks. In partially molten rocks, melt is distributed in nanometer to micron-sized pockets and tubules along corners and edges of the mineral grains in the rock. The shape, distribution, and connectivity of these melt-rich pockets and tubules determine the rate and direction of melt transport through the rock. The area fraction of the grain surface wetted by the melt tubules and pockets controls a large number of physical properties, including the seismic signature of the partially molten rock. This project will lead to the development of a theoretical framework for quantifying the shape and distribution of the melt tubules and melt pockets in a partially molten rock. The analytical and numerical tools developed in this project will identify the forces that control the melt geometry, predict the redistribution of melt tubules and melt pockets in partially molten rocks in response to the forces of deformation, and use the observed seismic signature of the so-called ultra low velocity zones to infer the extent of melting and melt storage in the deep interior of the Earth.