摘要
本文主要研究川东台阶状逆断层中断层岩的超显微构造特征。通过透射电子显微镜(TEM)对三个方解石样品的观察与分析,揭示了方解石的位错亚构造有:弯曲的自由位错、位错环、位错缠结、位错网、微双品和堆垛层错。自由位错密度为4.03×10~8cm^(-2)。根据上述特征,说明方解石的变形已基本进入稳态阶段。据自由位错密度与差异应力的关系式,算出了断层活动的差异应力值。
This paper mainly deals with the ultramicrostructural features of faulted rocks from stepped reverse faults in eastern Sichuan. Observations of three calcite specimens under the TEM have revealed that the dislocation substructures of calcite include bended free dislocations, dislocation loops, dislocation nodes, dislocation networks, microtwinning and stacking faults. The average free dislocation density is 42×10~8cm^(-2). The above-mentioned features show that the deformation that calcite underwent has entered the stage of basically stable state. According to the relation between the free dislocation density and differential stress σ_1—σ_3=3((?)×b×ρ^(1/2))/2, the differential stress of faults is 483.7×10~5Pa.
出处
《地质论评》
CAS
CSCD
北大核心
1990年第5期460-466,T001,共8页
Geological Review
