俯冲带含水矿物脱水是一种常见的地质作用，含水矿物脱水致脆性破裂被认为是触发俯冲带中源地震的重要成因机制。已有的含水矿物脱水动力学研究多集中于无水条件，而含水条件下样品的粒径以及流体组分和压力等外界因素对含水矿物脱水动力学过程的影响仍尚不清楚。硬柱石是俯冲带中一种极为重要的变质含水矿物，在一定温度和压力条件下发生脱水分解并释放大量流体。本项目将开展NaCl溶液和粒径对硬柱石脱水动力学影响的实验研究，获得不同P-T条件下硬柱石的脱水速率和脱水机制参数。在此基础上，分别建立脱水速率与压力、NaCl溶液浓度以及粒径之间的定量关系，以期正确揭示和评价NaCl溶液和粒径对硬柱石脱水动力学的影响。通过与前人的研究结果对比，可能从中获得对硬柱石脱水反应机制的新认识。基于硬柱石的脱水动力学研究，为进一步确定硬柱石脱水能够诱发俯冲带上地震带中的地震活动提供必要的理论依据。

The dehydration of hydrous mineral in subduction zones is a common geological process, and that the process of dehydration embrittlement of hydrous mineral is usually considered as the important genetic mechanisms for the trigger of intermediate-depth earthquakes in subduction zones. The published studies on the dehydration kinetics of hydrous minerals mainly concentrated on the anhydrous conditions, but the effects of some factors such as particle size of sample, fluid component and pressure on the dehydration kinetics of hydrous minerals remain unclear. Lawsonite is an extremely important metamorphic water-bearing mineral in subduction zone, and it will dehydrate and release plenty of fluid under a certain temperature and pressure conditions. In this project, we attempt to carry out an experimental study on the effects of NaCl solution and particle size on the dehydration kinetics of lawsonite, thus obtaining the dehydration rate and dehydration mechanism of lawsonite at different P-T conditions. On this basis, the quantitative relationship among dehydration rate, pressure, NaCl solution concentration and particle size will be established, espectively, in order to correctly reveal and evaluate the effects of NaCl solution and particle size. By comparing with results of previous studies, it may lead to a new understanding of the dehydration mechanism of lawsonite. Based on the dehydration kinetics study of lawsonite, we will provide necessary theoretical basis for the further determination of the dehydration of lawsonite as a trigger of the earthquake occurred in the upper seismic zone of subduction zone.