Microstructural Features of Garnets in Jadeite Quartzite from Dabie Mountains, China  

作　　者：Wu Xiuling Mou Tao Han Yujing Test Center, China University of Geosciences, Wuhan 430074, China Li Douxing Laboratory of Atomic Imaging of Solid, Institute of Metal Research, Academia Sinica, Shenyang 110015, China 

出　　处：《Journal of Earth Science》2000年第3期158-161,共4页地球科学学刊（英文版）

基　　金：This paperis supported by the National Natural Science Foundation of China( No.49872 0 69)

摘　　要：Garnet is an important rock forming mineral of high pressure and ultrahigh pressure metamorphic rocks. Its popular isomorphism complicates its chemical composition and crystal structure. The selected area electron diffraction (SAED) and the high resolution electron microscopy (HREM) are used in this work to study the microstructures and ultrastructures of garnets in the jadeite quartzite from Dabie Mountains, China. The microstructures of the garnet occur mainly as free dislocations, dislocation walls, stacking faults, dislocation networks and sub grain boundaries. The dislocation density is ρ=n ×10 8/cm 2 ( n =1.7—7.5) and the deformation mechanism is the dislocation glide and dynamic recovery. The superstructures of the garnet crystal revealed by HREM occur mainly as dislocations, faults, domain structures and lattice deformations, indicating the strong stress during the formation of the jadeite quartzite.Garnet is an important rock forming mineral of high pressure and ultrahigh pressure metamorphic rocks. Its popular isomorphism complicates its chemical composition and crystal structure. The selected area electron diffraction (SAED) and the high resolution electron microscopy (HREM) are used in this work to study the microstructures and ultrastructures of garnets in the jadeite quartzite from Dabie Mountains, China. The microstructures of the garnet occur mainly as free dislocations, dislocation walls, stacking faults, dislocation networks and sub grain boundaries. The dislocation density is ρ=n ×10 8/cm 2 ( n =1.7—7.5) and the deformation mechanism is the dislocation glide and dynamic recovery. The superstructures of the garnet crystal revealed by HREM occur mainly as dislocations, faults, domain structures and lattice deformations, indicating the strong stress during the formation of the jadeite quartzite.

关 键 词：jadeite quartzite GARNET MICROSTRUCTURE HREM. 

分 类 号：P578[天文地球—矿物学]