Collaborative Research: Experimental Investigation of the Electrical Properties of Hydrous Silicate Melts in Subduction Context

俯冲的动力学和时间演化是由影响浮力、板块运动、对比热场、相平衡和挥发性输运的机械和化学过程驱动的。通过加强质量传递和能量释放，俯冲带中的流体循环（特别是含水硅酸盐熔体）是板块再循环、弧火山作用和大陆形成过程的主要组成部分。因此，更好地了解熔体和挥发物在俯冲中的作用是提高我们对俯冲带的结构和组成以及起作用的地球动力学过程的认识的关键。它还可以帮助我们更好地评估这些地区的火山和地震灾害。本项目是一项多学科、多尺度的俯冲背景下含水硅酸盐熔体电导率的研究，在地幔楔深和更浅的地方，以表征和模拟俯冲带含水硅酸盐熔体的电响应。将在与干硅酸盐和含水硅酸盐熔体的俯冲带有关的压力和温度条件下进行现场电气测量。主要目的是通过地球物理（电磁）测量成像，更好地了解俯冲带中熔体和挥发物的输运性质。

The dynamics and time-evolution of subduction are driven by mechanical and chemical processes that influence buoyancy forces, slab motion, contrasting thermal fields, phase equilibria, and volatile transport. By enhancing mass transfer and energy release, the cycle of fluids (and in particular, hydrous silicate melts) in subduction zones is a major component of slab recycling, arc volcanism, and continent-building processes. A better understanding of the role of melt and volatiles in subduction is therefore key to improving our knowledge of the structure and composition of subduction zones as well as geodynamic processes at work. It can also help us better assess volcanic and earthquake hazards in these contexts.This project is a multi-disciplinary and multi-scale investigation of the electrical conductivity of hydrous silicate melts in subduction context, at the depth of the mantle wedge and shallower, in order to characterize and model the electrical response of hydrous melts in subduction zones. In situ electrical measurements will be performed at pressure and temperature conditions relevant to subduction zones on dry and hydrous silicate melts. The major objective is to understand better the transport properties of melts and volatiles in subduction zones as imaged by geophysical (electromagnetic) surveys.