中文摘要：

对福建魁岐花岗岩、大别山罗田地区条带状混合岩及其中的浅色脉体进行酸腐蚀并对腐蚀像进行研究。通过微分干涉相衬显微镜（DIC）、原子力显微镜（AFM）、扫描电子显微镜（SEM）对这3种岩石中α-石英颗粒的腐蚀像观察,结果表明：用腐蚀法可以对岩石中的α-石英颗粒进行定向,从而研究缺陷的走向;利用α-石英双晶腐蚀像的差异可以将道芬双晶与巴西双晶进行区别,通过统计发现3种岩石标本中道芬双晶出现的概率远远高于巴西双晶。观察腐蚀像作为一种研究岩石中α-石英缺陷与双晶种类的方法,具有比常用的衍射法更加直观且简单易行、费用低的优点。

英文摘要：

Etch figures are studied for the α-quartz crystals in the granite in Kuiqi,Fujian and striped migmatite as well as the light-colored veins in Luotian,Dabie Mountains.Based on the observation under differential interference microscope（DIC）,atomic force microscope（AFM）,scanning electron microscope（SEM）,it is shown that the etch figures can determine the orientation of α-quartz in rocks and the directions of the defects in α-quartz.Etch figures show the differences between Dauphine twinning and Brazil twinning to distinguish Dauphine twinning and Brazil twinning,and the appearing probability of Dauphine twinning and Brazil twinning in the three kinds of rocks.The statistic result shows that the appearing probability of Dauphine twinning is much higher than that of Brazil twinning.The application of etch figures for the orientation and the defects,and for the identification of twinning types are more convenient and more economic than the diffraction methods.