Multiphase Modeling of Solidification and the Dynamics of Magma Chambers

凝固的多相模拟和岩浆室的动力学

• 批准号: 9805336
• 负责人: George Bergantz
• 金额: $ 8万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-07-15 至 2001-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9805336&HistoricalAwards=false
• 关键词: Multiphase; Modeling; Solidification; Dynamics; Magma

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.

9805336 Bergantz火成岩的化学演化基本上是一个晶液分离的过程。本研究的目的是开发和扩展一个多相结晶的数值方法，明确允许晶体和熔体之间的相对运动，同时在内部的岩浆体和边界层的顶部，墙壁和地板。这将包括许多过程，是中央地质应用，如热和成分浮力，粘度变化，凝固和熔化的动力学效应，晶体沉降，晶体羽流和不稳定性，成分对流地区的晶体糊，和夹带的晶体从岩浆房地板。一些模型已经实施，但有关的成核和共晶行为的细节和变量流变性能和功能的重要功能需要进一步完善。将探讨这一模式在大洋中脊玄武岩系统的冷却和动力学以及对流活动引起的累积物堆混合和破裂系统方面的具体应用。