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以天然叶腊石为传压介质 ,在温度 80 0～ 10 0 0℃、围压 0 .6～ 1.0GPa和应变速率 10 -4～ 10 -5s-1条件下 ,对Maryland辉绿岩的脆性 -塑性转化进行了实验研究 .实验结果表明 ,在10 -4 ～ 10 -5s-1应变速率和固定围压 1.0GPa条件下 ,当温度低于 80 0℃时 ,岩石变形为典型脆性破裂 ;温度高于 10 0 0℃时岩石变形以准稳态蠕变为主 ;温度在 80 0～ 95 0℃之间 ,岩石变形从脆性破裂向准塑性流动转化 .温度变化对岩石脆 -塑性转化影响敏感度高于压力变化对变形的敏感度 .显微构造观察显示 ,辉绿岩脆 -塑性转化以稀疏弥漫状共轭塑性流动网络为特征 .
Using natural pyrophyllite as pressure transmission medium, the brittleness-ductility of Maryland diabase was studied under the conditions of the temperature of 80 0 ~ 100 ℃, confining pressure of 0.6 ~ 1.0GPa and strain rate of 10 -4 ~ 10 -5s-1. The experimental results show that the rock deformation is a typical brittle failure at a strain rate of 10 -4 ~ 10 -5 s -1 and 1.0 GPa at a fixed confining pressure of 80 ℃. The temperature is higher than The rock deformation is dominated by quasi-steady state creep at 10 0 ℃, and the deformation of rock from brittle fracture to quasi-plastic flow at temperatures between 80 0 ~ 95 0 C. The sensitivity of temperature change to rock brittle-plastic transition is high The sensitivity of the pressure changes to deformation.The microstructural observation shows that the diabase brittle-plastic transformation is characterized by the sparse diffuse conjugate plastic flow network.