我国南方部分花岗岩风化壳中残留长石的表面结构

综合应用扫描电镜、透射电镜等技术手段，研究了我国热带、亚热带地区五个花岗岩风化壳中残留长石的表面结构特征．在风化作用过程中，长石晶体表面发生了显著的不均衡溶蚀，并形成多种富特征性的溶蚀痕迹；双晶接合面、解理面、条纹长石中的主、嵌晶界面、构造破裂面等部位是长石晶体上优先溶蚀的部位．风化残留长石表面结构特征形成的因素包括长石的结晶学性质、研究区的气温、降水条件及长石晶体被风化的程度．建议在沉积岩成岩作用等研究工作中，应注意陆源长石碎屑表面可能存在的风化溶蚀痕迹对有关研究结果的影响．

SURFACE TEXTURES OF FELDSPARS FROM WEATHERED GRANITE CRUSTS IN THE SUBTROPICAL AND TROPICAL AREAS IN THE SOUTH OF CHINA

Surface textures of feldspars from five weathered granite crusts of the subtropical and tropical areas in the south of China are studied with scanning electron microscope,transmission electron microscope and other experimental techniques. It is found that dissolution of feldspars during weathering occured primarily at cleavage cracks, twin strations, microfissures and the interface between oikocryst and the inset. As a result of dissolution, distinctive etch pits developed on the weathered feldspar surface. In addition to the crystallographic natures, the factors affecting formation of surface textures of weathered feldspars include fairly high temperature,plenty of precipitation of the studied areas and indensity of weathering of the mineral.