摘要
四川西部安宁河断裂带是南北向长达600km的深断裂带,属岩石圈断裂,具长期发育的历史。断裂带的构造岩以糜棱岩和碎裂岩为主。构造岩中石英和云母塑性变形清楚,绝大多数长石表现为脆性变形。断裂显示了压性和压扭性特征。透射电镜研究,其差应力为110～130MPa,应变速率在10^(-13)s^(-1)数量级。该断裂属脆-韧性剪切带。
The Anninghe fracture zone is located in the western Sichuan and about 600km long in N-S. It belongs to a lithiospheric fracture and has a long evolutionary process. According to the researchresult, the tectonite consists of mylonite and cataclasite in the fracture zone. It is very clear that thequartz and the mica show plastic deformation in the tectonite. But, almost all the feldspars show thebrittle deformation. The microstructural kinematic analysis shows compressive and shearing properties.Based on the study of transmission electron microscope, the stress difference generally is fron 110 to130 MPa and the strain rate is estimated in the grade of 10^(-13) sec^(-1). This fracture zone belongs to abrittle-ductile shear zone.
关键词
安宁河
断裂带
显微构造
动力学
Anninghe fracture zone
mylonite
cataclasite
brittle-ductile shear zone
