The Thermodynamics, Fluid Dynamics and Chemistry of Deep Mantle Melts: Models of Archean Magmatism

9614178个具有极高喷发温度的火花科马提岩熔岩提供了关于太古宙地幔的独特信息。太古代科马提岩的主要元素组成的简单模型表明，在非常高的温度和压力下(潜在温度大于1800摄氏度，深度至少250公里)熔融，但对地幔这些地区的上涌、熔融和熔体提取的动力学尚不清楚。PI建议将地幔对流和熔融的数值模型与高压熔融实验的熔体成分的参数化相结合。这些模型将被用来系统地探索太古宙地幔的不受约束的性质和条件(温度、成分、粘度、熔体迁移渗透率、岩石圈厚度)对所产生的熔体的常量和微量元素组成的影响。超镁和其他太古宙岩石的成分将被用来约束模型的假设和假设。一个灵活而有效的模型，可以确定流体动力学和地幔熔融化学之间的依赖和相互作用，将提供对太古代地幔动力学的洞察和指导，以确定未来实验计划的优先事项。

9614178 Sparks Komatiite lavas, with extremely high eruption temperature provide unique information about the Archean mantle. Simple models of the major element compositions of Archean komatiites indicate melting at very high temperatures and pressures (potential temperatures greater than 1800C and depths of at least 250 km), but the dynamics of upwelling, melting and melt extraction in these areas of the mantle are not understood. The PI proposes to integrate a numerical model of mantle convection and melting with parameterizations of melt compositions from high pressure melting experiments. These models will be used to systematically explore the effects of poorly constrained properties of and conditions in the Archean mantle (temperature, composition, viscosity, melt migration permeability, lithospheric thickness) on the major and trace element composition of the melts that are produced. The compositions of ultramafics and other Archean rocks will be used to constrain the hypotheses and assumptions of the models. A flexible and efficient model that can determine the dependencies and interactions between the fluid dynamics and chemistry of mantle melting will provide both insight into the dynamics of the Archean mantle and guidance in setting the priorities of future experimental programs.