The crystal alignment in sample center is not obviously orientational, while the mica crystal in peripheral area is highly directionally aligned owing to the intense viscous flow of glass phase and rotation of mica crystal.

• 样品径向中心定向排列不明显，而靠近周边部位因玻璃相和云母晶体的强烈黏滞流变和转动，使云母晶体高度定向排列。