Collaborative Research: The Dynamics of Plume-Ridge Interaction

9707604里贝广泛的地球物理和地球化学证据表明，地幔热柱与附近的洋脊相互作用强烈。私人投资促进机构建议进行一项由四部分组成的研究，以调查这一过程的动态及其地球物理影响。第一种是利用润滑理论、变粘性三维对流模型和边界积分方法对羽流-脊线相互作用进行数值模拟。其主要目的将是确定受羽流影响的脊线长度、到达脊线的羽流通量的比例以及最大羽脊相互作用距离的标度律。第二项任务是对羽流与静止和移动的山脊的化学和热相互作用进行实验室实验。这项工作将对第一部分中确定的标度定律进行实验检验。第三项任务是将三维对流模型应用于加拉帕戈斯热点，目的是约束热点下地幔动力学和结构的关键方面，如过高温度、浮力物质的分布和地球化学不均质性。冰岛热点附近的地震各向异性和剪切波分裂观测的三维动力学模拟是第四个项目任务。目的是为了解决产生冰岛的烟柱的宽度和过高温度这一有争议的问题。***

9707604 Ribe Extensive geophysical and geochemical evidence indicates that mantle plumes interact strongly with nearby ocean ridges. The PIs propose a four-part study to investigate the dynamics of this process and its geophysical implications. The first involves numerical modeling of plume-ridge interaction using lubrication theory, a 3-D convection model with variable viscosity, and boundary integral methods. The principal aim will be to determine scaling laws for the length of ridge affected by the plume, the fraction of the plume flux reaching the ridge, and the maximum plume-ridge interaction distance. The second task is laboratory experiments on the chemical and thermal the interaction of plumes with stationary and migrating ridges. This work will provide an experimental test of the scaling laws determined in part 1. The third task is the application of the 3-D convection model to the Galapagos hotspot with the goal of constraining critical aspects of the dynamics and structure of the mantle beneath the hotspot, such as the excess temperature and the distribution of buoyant material and geochemical heterogeneities. 3-D dynamical modelling of seismic anisotropy and shear-wave splitting observations near the Iceland hotspot are the fourth project task. The aim is to resolve the controversial question of the width and excess temperature of the plume that generates Iceland. ***