Development of Models for Coupled Geochemical/Geophysical Dynamics at Subduction Zones

俯冲带和岛弧的岩浆活动和地幔对流是影响地球地球化学和物理演化的主要过程。拟议的工作的目的是发展一套定量的计算机模型，将这些深度的过程与地面的观测资料联系起来，特别是在岛弧喷发的挥发物和岩浆的组成和体积。这就要求开发出能够持续求解形变的对流地幔中反应性岩浆传输的代码。在为海洋中脊融化而设计的一套广泛的模型的基础上，这些新的代码将扩展到包括挥发物对岛弧融化的影响。这两套模型将为研究地幔的耦合地球物理/地球化学动力学提供一致的框架。

Magmatism and mantle convection at subduction zones and island arcs are some of the principal processes affecting the geochemical and physical evolution of our planet. The purpose of the proposed work is to develop a set of quantitative computer models that can relate these processes at depth to observations available at the surface, particularly the composition and volume of volatiles and magmas that erupt at island arcs. This requires developing codes that can consistently solve for reactive magma-transport in a deforming convecting mantle. Based on an extensive set of models designed for melting at mid-ocean ridges these new codes will be extended to include the impact of volatiles on melting at island arcs. Both sets of models will provide a consistent framework for investigating the coupled geophysical/geochemical dynamics of the Earth's mantle.