Three dimensional modeling of dynamic microstructure

动态微观结构的三维建模

• 批准号: 1215800
• 负责人: Saswata Hier-Majumder
• 金额: $ 28.94万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-07-01 至 2019-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1215800&HistoricalAwards=false
• 关键词: Three; dimensional; modeling; dynamic; microstructure

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.

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、盘或袋中，其尺寸小至人类头发宽度的一部分。这些不同形状的熔体单元的相对丰度取决于熔融的动态环境和熔体的化学组成。熔体几何形状的签名，熔体分布在这些不同的单位的平均描述，通过这些地区的地震波采样。通过解读这些地震波的信号，人们可以了解与地球深部融化有关的过程，在这个项目中，我们继续开发一个新的理论工具箱，“微地球动力学”，以解决探测地球部分融化的问题。的内部和熔体储存和偏析的动力学。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（如弹性模量和熔体流动性）的影响。这些模型的输出，动态熔体几何形状，将被处理，以解释在地球内部深处的各种物理性质的观测异常。