LAYER STACKING MICROSTRUCTURES IN A BIOTITE SINGLE-CRYSTAL - A COMBINED HREM-AEM STUDY

被引：21

作者：

BARONNET, A ^{[1
]}

NITSCHE, S ^{[1
]}

KANG, ZC ^{[1
]}

机构：

[1] UNIV AIX MARSEILLE 3,CRMC2,F-13288 MARSEILLE 9,FRANCE

来源：

PHASE TRANSITIONS | 1993年 / 43卷 / 1-4期

关键词：

BIOTITE; MICROSTRUCTURES; POLYTYPISM; COMPOSITION; HIGH RESOLUTION TEM; ANALYTICAL ELECTRON MICROSCOPY;

D O I：

10.1080/01411599308207805

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

A detailed investigation of the as-grown layer-stacking microstructures and the attached microcomposition has been carried out by combined KREM-AEM in a Chinese biotite single crystal. 1M, 2M(1), faulted 3T and semi-random 1Mr n(120) coexist as coherent intergrowths. If no strictly periodic complex polytype is found, we evidence oscillatory stacking modes as quasi-periodic 1D-modulated structures at 1M-2M(1) and 1M-3T binary junctions. The transition from order (1M,2M(1)) to disorder is progressive. Careful study of isolated stacking faults in 1M, 2M(1) and 3T matrices shows that they do not follow the least stacking fault energy requirements. Rather they are embryos of alternate polytypes. Microcompositional data show differences between 1M, 2M(1) and 1 Mr n(120) structures. Our investigations suggest a significant coupling between the layer-stacking microstructure and the composition. Both of them seem to be fingerprints of the environmental conditions of growth of the biotite mica.

引用

页码：107 / 128

页数：22

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