Collaborative Research: Advanced modeling for understanding fluid and magma migration in subduction zones

流体和固体的相互作用控制着俯冲带中一些最关键的地球化学和地球动力学过程。这包括地幔的熔融和流体和岩浆的地球化学运输，地幔楔体可能的流变弱化，以及地震活动和断层力学的控制。固体地幔流动的定量模型已经被开发出来，但在数值模拟流体和熔体与固体的产生、传输和耦合作用方面的工作相对较少。这需要一个更通用的计算框架，能够处理物理模型和输入参数空间中的广泛不确定性。该项目继续开发Terraferma(透明有限元快速模型组装器)，它将用于：量化俯冲区潜在的流体和固体流动路径；更好地了解反应性、开放系统的熔剂熔化；以及研究流体对固体流变学的影响。模型预测将与一系列观测结果相对照，从弧形火山活动的相对可靠位置到这些地点产生的熔岩样本的成分。该项目的更广泛影响包括支持在计算科学和地球科学之间工作的一名早期职业科学家，以及开发一种新的计算机代码，用于综合俯冲带的地球化学和地球化学动力学。由此产生的计算机代码将被并入地球科学计算基础设施的持有者手中，该机构提供开放访问用于科学目的的软件。增加对俯冲带上地幔变形、岩浆作用和地球热结构的了解，可以提高对标志着下行板块和周围地幔之间边界的巨型逆冲断层上哪里或多或少可能发生脆性行为(地震)的了解。

The interactions of fluids and solids control some of the most critical geochemical and geodynamic processes in subduction zones. These include flux melting of the mantle and geochemical transport by fluids and magma, possible rheological weakening of the mantle wedge, and control of seismicity and fault mechanics. Quantitative models for the solid mantle flow have been developed but there has been relatively little work to numerically simulate the production, transport, and coupled interactions of fluids and melts with the solid. This requires a more general computational framework that can deal with a wide range of uncertainty both in the physical model and input parameter space. This project continues the development of TerraFERMA (the Transparent Finite Element Rapid Model Assembler), which will be used to: quantify potential fluid and solid flow paths at subduction zones; develop a better understanding of reactive, open system flux melting; and investigate the effects of fluids on solid-state rheology. Model predictions will be tested against a suite of observations from the relatively robust location of arc volcanism to the compositions of lava samples produced at these sites. Broader impacts of this project include support of an early career scientist working at the interface between computational and Earth science and the development of a new computer code for integrating geochemical and geochemical dynamics in subduction zones. The resulting computer code will be incorporated into holdings of Computational Infrastructure for Geosciences, which provides open access to software for scientific purposes. Increased understanding of mantle deformation, magmatism, and thermal structure of the Earth at subduction zones could lead to improved knowledge of where brittle behavior (earthquakes) is more or less likely along the megathrust fault that marks the boundary between the downgoing plate and the surrounding mantle.