Cross-scale modeling of magma migration and storage

岩浆运移和储存的跨尺度建模

• 批准号: 0809689
• 负责人: Saswata Hier-Majumder
• 金额: $ 22万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0809689&HistoricalAwards=false
• 关键词: Cross; scale; modeling; magma; migration

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.

熔岩在地球深处的迁移和储存在很大程度上受岩石的微观结构控制。在部分熔融的岩石中，熔体沿岩石中矿物颗粒的角落和边缘以纳米级的形式分布到微米级的口袋和小管中。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传输的速度和方向。颗粒表面被熔融的小管和口袋润湿的面积比例控制着大量的物理性质，包括部分熔融岩石的地震特征。该项目将导致开发一个理论框架，用于量化部分熔岩中熔体小管和熔体口袋的形状和分布。该项目中开发的分析和数值工具将确定控制熔体几何形状的力，预测部分熔岩中熔体小管和熔囊的重新分布，以响应变形力，并利用观测到的所谓超低速带的地震特征来推断地球深处的熔融和熔体储存的程度。