Abstract: This paper describes the features of ineelastic deformation of Qianan quartzite, especially the formation process and the variation with increasing temperature and pressure.The study shows that increasing temperature and pressure is most favorable to the-transition of quartz from elastic to plastic component, which will greatly change the macrodeformation features. Once the transition of quartz reaches a certain amount, it will decrease the strength of quartzite and give rise to the instability.In order to explain the results of experiment, a series of empirical equations have been established for the P, T dependences of inelastic deformation and plastic component, for the relationship between plastic component and inelastic deformation, as well; as for the relation between the plastic component and the factor of released elastic energy.

Key words: Quartz, High temperature and high pressure, Experimental deformation

摘要： 本文通过研究地壳温压条件下迁安石英岩非弹性变形特征和机制,着重阐述了这类岩石产生非弹性变形的能力和温度压力之间的关系,以及对岩石宏观失稳型式的影响。研究表明,温度和压力的升高将导致岩石中石英晶粒逐步转化为塑性组分,转化过程中伴随着岩石宏观非弹性变形的增强。宏观非弹性变形增强幅度和微观转化为塑性组分的石英晶粒含量满足一定的统计关系。当转化的塑性组分达到一定量级时,岩石的宏观力性和失稳型式将产生明显变化,变化的趋势是易于产生非弹性变形而渐进失稳。

关键词: 石英, 高温高压, 实验变形