剪切作用下断层泥的SEM显微结构特征研究

Study on SEM microstructure properties of fault gouge under shearing force

在模拟断层泥的摩擦实验基础上,对辉长岩的2种主要组成矿物斜长石和辉石实验后的标本进行了SEM显微结构的观察与分析,以期从实验室角度去理解下地壳断层活动的性质和特点。斜长石模拟断层泥剪切带中边界剪切面、R1和Y剪切面比较发育,P、R2和X剪切面不发育;辉石剪切带中仅边界剪切面与R1面较为发育。然而,2种主要矿物究竟如何影响辉长岩滑动特性的问题,仍有待进一步深入研究。

On the basis of experiment on friction sliding of simulated fault gouge,the authors carried out the observation and analysis of the SEM microstructure about the mineral samples of plagioclase and pyroxene,which were the two main gabbro composition and were based on the experiment,for the purpose of understanding fault activity in deep crust.The boundary shear,R1shear andYshear planes were well developed in the plagioclase simulated fault gouge,butP,R2andXshear planes were scarcely observed.The boundary shear plane andR1shear plane were developed in pyroxene shear zone.However,the effect extent on the sliding features of gabbro through the study of the above two minerals remain to be further proved.