随南早古生代火山岩中辉石的显微构造特征

Microstructure of pyroxene in the Paleozoic volcanic rocks, Suizhou county, Hubei province, China

大别造山带中的随南火山岩主要发育块状和斑状结构 ,辉石呈斑晶形态。透射电镜研究表明 ,辉石中的主要显微构造特征为位错排、位错倾斜壁、位错网、亚颗粒和位错环 ,以及长直位错线和弯曲位错线等位错亚构造 ,并发育有层错群、晶界及界面位错等晶体缺陷。

The volcanic rocks in south Suizhou county within the Qinling and Dabie orogenic belt have mainly developed with massive and porphyritic textures,with pyroxenes as porphynoclasts. The main microstructural characteristics of pyroxenes revealed by TEM studies were the dislocation structures such as dislocation lines,dislocation tilt walls,dislocation networks and the dislocation loops formed in the high temperature strain stage,the dislocation substructures such as long dislocations and dislocation bows formed in the low temperature strain stage,and the other crystal defects such as stacking fault groups,crystal boundaries and boundary dislocation. So it can be inferred that the volcanic rocks in south Suizhou must have undergone the dynamic restorations of high temperature creep and low temperature strain.