天然碱性长石的高分辨电镜观察  

HREM OBSERVATION OF NATURAL ALKALI FELDSPAR

作　　者：西门露露 王岩国[2] 马兴加 

机构地区：[1]复旦大学材料科学研究所,上海200433 [2]中国科学院固体原子像实验室,沈阳110015 [3]辽宁大学物理系,沈阳110003

出　　处：《矿物学报》1992年第2期97-101,T002,共6页Acta Mineralogica Sinica

摘　　要：利用高分辨电子显微镜观察了产于河北汉诺坝玄武岩中碱性长石的精细结构。不同取向的高分辨像清楚地显示了钾、钠长石形成的片层状多重紧密连生体以及各种调制结构。钾、钠长石的连生界面一般为(601)晶面。其超微结构特征与在中等冷却速率下钾钠长石中按旋节分解机制产生的熔离结构相符。以(010)面为孪晶界面的多重连生微孪晶构成了平均周期约为8*d_(010)的调制结构。The fine structure of natural alkali feldspar selected from the basalt in the Hannuoba district, China was investigated by means of high resolution electron microscopy(HREM). The multiple intergrowth of albite and orthoclase with (601) as the interphase boundary as well as the modulated structure resulting from the ordering of twin interfaces were shown clearly in the high resolution images. The twinning was found to be coincident with the albite law. A possible genetic explanation of the characteristic features of the microstructure is presented on the basis of the spinodal decomposition involved in solid solution of alkali feldspar.

关 键 词：碱性 高分辨 电镜 精细结构 长石 

分 类 号：P578.968[天文地球—矿物学]