摘要
利用高分辨电子显微术研究了陨石和地幔岩中辉石的超微结构,观察并发现了多种畸变结构现象。清镇和吉林陨石顽火辉石中的斜顽辉石受冲击作用,SiO_3链发生弯曲甚至断裂并沿a轴方向错动36的距离,同时还有(100)扭转晶界形成,不同类型的SiO_3链相互转变形成了(001)90°和180°畴结构。单斜辉石中则有(100)层错和孪晶及其有关的缺陷。
The microstructures of natural pyroxenes in meteorites and mantle-derived rocks have been studied by high-resolution electron microscopy (HREM). A number of deformed structures have been discovered. Both curving and displacement of SiO_3 chains along the a axis and the (100) grain boundary were caused by shock effects in the Qingzhen enstatite chondrite and the Jilin chondrite. Under shear stress the (001) 90° and 180° domain structures were produced and there were also (100) stacking faults and twinning crystals with the misfit interfaces introduced into pyroxenes from the mantle-derived rocks.
出处
《矿物学报》
CAS
CSCD
北大核心
1991年第2期133-140,共8页
Acta Mineralogica Sinica
基金
国家自然科学基金
关键词
辉石
缺陷
结构
陨石
透射电镜
pyroxene
defect structure
meteorite
HREM
