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、相平衡和挥发物运输的机械和化学过程驱动的。通过增强物质传递和能量释放，俯冲带中的流体（特别是含水硅酸盐熔体）循环是板块再循环、弧火山作用和大陆建造过程的主要组成部分。因此，更好地了解熔体和挥发分在俯冲作用中的作用是提高我们对俯冲带结构和组成以及工作中的地球动力学过程的认识的关键。该项目是对俯冲带中含水硅酸盐熔体的电导率进行多学科和多尺度的研究，在地幔楔的深度和较浅处进行，以描述俯冲带中含水熔体的电响应特征并建立模型。将在与俯冲带有关的压力和温度条件下对干燥和含水硅酸盐熔体进行现场电测量。主要目的是更好地了解地球物理（电磁）勘测成像的俯冲带中熔体和挥发物的传输特性。

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.