矿物热分解动力学的研究方法探讨

Methods for Determining Thermal Decomposition Kinetics of Minerals: An Introduction

:矿物分解动力学的研究可以大大提高我们对地质作用过程中矿物生长、元素和流体迁移等过程的了解。本文在介绍固相反应动力学原理的基础上 ,讨论了常压下研究矿物分解动力学的热重分析法和电导率法 ,指出精确确定高压下的反应分数 ,是研究高压下矿物热分解动力学的关键。提出了高压下确定反应分数的方法。

The thermal decomposition kinetics of minerals is a fundamental but poorly understood geological process. Knowledge about thermal decomposition kinetics of minerals will improve our understanding the processes of crystal growth, element immigration and fluid flow in geological condition. The principle of reaction kinetics of solid is introduced in this paper at first, and then two methods, thermogravimetry and conductivity method, usually used in researching the decomposition kinetics at atmosphere pressure are discussed. At high pressure, the key for determining the mineral decomposition kinetics is the measurement of the reaction fraction and two methods are recommended. One is statistic method, which measures the volume of new formed mineral optically. The other is electrical conductivity method, which measures the electrical conductivity during mineral decomposition.