东秦岭灰池子花岗岩体的岩石结构特征及变形演化

灰池子岩体主要由花岗岩类岩石组成,该岩体岩石普遍具变形结构,变形过程较复杂。据岩石结构、矿物生长关系和野外产状特征,变形过程大体可划分为两期,第一期又可划分为二个幕。第一期变形的温度高,矿物动态重结晶显著,但S-C面理、S-L组构不发育,产状上下呈带状分布。这些特征与常见糜棱岩很不相同,推测第一期变形是岩体底辟侵位过程中发生的。第二期变形形成具一般特征的糜棱岩,变形环境大体属绿片岩相。

ROCK TEXTURE CHARACTERISTICS AND DEFORMATION EVOLUTION OF HUEICHIZI GRANITIC PLUTON IN THE EAST QINLING REGION

The Hueichizi granitic pluton consists mainly of granitoid rocks. which have in common deformation fabric and complicated deformation processes. According to the characteristics of the rock texture , relationship between mineral growth and field occurence, the deformation processes of granitoid can be divided into two periods, the first of which has two episodes. The temperature of the first period of deformation is higher, and the dynamic -recrystallization of minerals is distinct,but S-C foliation and S-L fabric don't develop and deformation rocks don't show zonal distribution. These characteristics of rocks are very different from mylonite. The authors inferred that the first period of deformation of rocks occurred during the processes of diapiric emplacement of granitic pluton. The second period of deformation formed common mylonite, whose deformation environment belongs to greenschist facies on the whole.