Multiphase Modeling of Solidification and the Dynamics of Magma Chambers

火成岩的化学演化本质上是一个结晶-液体分凝过程。这项研究的目的是开发和推广一种多相结晶的数值方法，这种方法明确地允许晶体之间的相对运动，并同时在岩浆体内部和屋顶、墙壁和地板的边界层中熔化。这将包括许多对地质应用至关重要的过程，如热和成分浮力、可变粘度、凝固和熔化的动力学效应、晶体沉淀、晶体羽流和不稳定性、晶体碎屑区域的成分对流以及从岩浆室底板卷吸晶体。一些模型已经实现，但与形核和共晶行为的细节以及与可变的流变性和功能相关的重要特征需要进一步改进。将探讨该模式在大洋中脊玄武岩系统的冷却和动力学以及涉及对流活动引起的堆积堆的混合和破坏的系统中的具体应用。

9805336BergantzThe chemical evolution of igneous rocks is fundamentally a process of crystal-liquid segregation. The objective of this research is to develop and extend a numerical approach to multiphase crystallization that explicitly allows for relative motion between crystals and melt simultaneously in the interior of the magma body and the boundary layers at the roof, walls and floor. This will include many processes that are central to geological applications such as thermal and compositional buoyancy, variable viscosity, kinetic effects of solidification and melting, crystal settling, crystal plumes and instabilities, compositional convection in regions of crystal mush, and entrainment of crystals from magma chamber floors. Some of the model is already implemented but important features relating to the details of nucleation and eutectic behavior and to variable rheological properties and functions require further refinement. Specific applications of this model to the cooling and dynamics of mid-ocean ridge basaltic systems and to systems involving mixing and disruption of cumulate piles by convective activity will be explored.