Dynamical Models for Melt Segregation

这项研究的目标是更好地了解熔岩是如何从地幔分离出来的，尤其适用于夏威夷群岛。PI计划对四个模型问题进行分析和数值研究：1)带有吸力的熔体分离，以确定熔体分离主要是由不同的浮力还是外部施加的压力梯度驱动的。2)熔融对流的有限元研究，分析了潜热和熔体浮力对对流动力学的影响。3)夏威夷群岛起源的动力-化学模型，以检验夏威夷火山岩石学/地球化学演化的两种可能解释：地幔热柱的化学变化，以及热柱与大洋岩石圈的相互作用。4)上升热中的熔融，以确定在地幔中孤立的浮动块中如何发生融化。建议按修订后的数额提供资金。

The goal of the researh is to better understand how melts segregate from the mantle, with particular application to the Hawaiian Islands. The PI plans an analytical and numerical study of four model problems: 1) Melt segregation with suction, to determine whether melt segregation is driven primarily by differential buoyancy or by externally applied pressure gradients. 2) A finite-element study of thermal convection with melting, to evaluate the influence of latent heat and melt byoyancy on the dynamics of convection. 3) Dynamical-chemical models for the origin of the Hawaiian Islands, to test two possible explanations for the petrological/geochemical evolution of Hawaiian volcanic: chemical variations across a mantle plume, and interaction of the plume with the oceanic lithosphere. 4) Melting in ascending thermals, to determine how melting occurs in isolated buoyant parcels in the mantle. Funding at the revised level is recommended.