Abstract: Microstructures of quartz in Honghe mylonite zone are studied and recent result of microstructural paleopiezometry is used in this paper to estimate the differential flow stress and strain rate for the southern Honghe fault zone. The calculations show that the differential flow stress during the development of mylonites of the southern Honghe fault zone varied gradually from 45MPa in the south to 120MPa in the north. Because the formation depth of mylonite zone became shallow from south to north, this variation indicates the decrease of flow stress with depth. The strain rate was roughly of the order of 10^-12/sec.

Key words: Microstructure, Dislocation, Subgrain, Dynamic recrystallization, Differential flow stress, Strain rate, Steady state flow

摘要： 本文利用断层岩中石英的显微构造参数,对红河断裂南段的古差异流动应力和应变速率进行了估算,结果表明,红河断裂南段糜棱岩带发育过程中的差异流动应力大约在45—120MPa之间,其变形速率大致为10^-12/s的量级。

关键词: 显微构造, 位错, 亚晶粒, 动态重结晶, 差异流动应力, 应变速率, 稳态流动