镁质闪石沿a轴堆垛无序性的透射电镜研究

在［１１］的基础上，对龙泉镁质闪石的高分辨透射电镜的研究。在［０１０］晶格条纹像中观察到了宽度为０．４５ｎｍ奇数倍的单斜闪石域，用普通的透射电镜技术观察到了钙质闪石出溶叶片，从而认为该闪石最初结晶时是单斜晶系的。样品中出现的正交域是由单斜相转变而来。由于矿物处于急冷的特殊地质环境中，这种转变未能进行得彻底，而形成了一种沿ａ轴堆垛层宽无序的现象。中还描述了这种闪石中见到的缺陷，并提出了结构模型。

HRTEM STUDY ON STACKING DTSORDER ALONG a-AXIS OF LONGQUAN MAGNESIAN AMPHIBOLE

On the basis of11], HRTEMtechnique was used for further study on Longquan magnesian amphibole.The monoclinic amphibole fields with odd time of 0.45nm in width, and calcic amphibole exsolution lamellae were observed. It is believed that at the initial crystallization stage, the magnesian amphibole is of monoclinic, and the orthorhomic field is transformed from the inonoclinic phase. Because the mineral was formed within a unique geological environment,the phase transformation from mondclinic amphibole to orthorhombic one can not be thorough. Thus the stacking disorder was formed along the a-axis. In this paper the lattice defect of this amphibole was also described, and its structure model is proposed.